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Beam Needs, Slab Design, and Attic Ventilation Issues

This Wednesday the Pole Barn Guru answers reader questions about LVL beam procurement, a question about slab in a flood prone area, and A1V in a non vented attic.

DEAR POLE BARN GURU: I need a 3 1/4″ x 7 1/4″ x 12′ beam. Is this something you can help me with? JAMES in TUCSON

 

DEAR JAMES: While we could provide it, freight would be astronomical. Try reaching out to the ProDesk at your nearby The Home Depot.

 

DEAR POLE BARN GURU: Hello Mike, our building lot is pretty much flat. I’m using the elevation of our street at the curb as a zero reference point for our build. We are in a coastal area with occasional very minor flooding, so I would like to have the finished floor level of our radiant slab at sixteen inches above that elevation. The frost depth at this site is twenty four inches as per our building department. I’m wondering if a monolithic frost protected slab would be practical for our 56 x 48 monitor style house? I’m open to any suggestions that will allow me to use the radiant in floor heat. We’ll be requesting a design and quote soon as we still have a few more details to figure out on our floor plan. Thanks RUSS in TILGHMAN

DEAR RUSS: I always tend to error on caution’s side. I would build site up so slab was no less than 100 year (if not 1000 year) flood level. Use embedded columns with rigid insulation around perimeter down 24 inches.

 

DEAR POLE BARN GURU: Hi, I’m building a garage I was planning on heating in the winter. I was planning on drywalling and insulating the entire thing. I mounted the metal roofing directly to the purlins not using any osb sheathing, and instead opted for a metal coated bubble radiant barrier with the required droop for an air gap to control condensation. Upon completing the roof I realized that it is a non-vented attic space. Do I need to cut out all the radiant barrier and apply a closed cell spray foam to seal up the attic in order to maintain a heated space below? It has a drop ceiling FYI. Thank you, ROB in MISSOULA

DEAR ROB: Most high quality closed cell spray foam insulation applicators will only spray onto inside face of steel roofing and/or siding. This leaves you some choices: Cut out barrier, or Vent attic space and insulate directly on top of your ceiling. Personally I would likely opt for choice number two. Vented soffit panels (not every soffit panel would need to be vented in order to keep proportions proper) and vented ridge closures could be shipped to you and fiberglass or granulated rockwool insulation could be blown in on top of your ceiling. This is likely to be less expensive than closed cell spray foam and you would only need to heat area below ceiling (as opposed to also heating dead attic space above ceiling).

This entry was posted in Insulation, Concrete, Pole Barn Questions, Building Interior, Pole Barn Design, Building Overhangs, Roofing Materials, Barndominium, Constructing a Pole Building, Pole Building How To Guides, Pole Barn Planning, Ventilation, Lumber and tagged , , , , , , on by .

A 100×100 Pole Building, Shingles to Steel, and Double-Bubble

This week the Pole Barn Guru answers reader questions about the possibility of a 100′ x 100′ pole building, the consideration of switching from asphalt shingles to steel roofing, and if one can reuse the “double-bubble” when replacing roof steel.

DEAR POLE BARN GURU: Can I build a 100 ft X 100 ft. pole building? JOHN in PENSACOLA?

DEAR JOHN: While 100 foot clearspans can be achieved using post-frame construction, most building uses do not have this sort of requirement. In general, it will be far more cost effective to get your 10,000 square feet with a rectangular footprint of 60 to 80 foot in clearspan width. If you are limited, by property constraints to 100 x 100, but do not necessarily have to have a clearspan, a row or two of strategically placed interior columns can assist in keeping your building investment down.

 

DEAR POLE BARN GURU: I’ve got a question for you finally. I have a house with asphalt shingles at the moment and was thinking about switching to steel. If I were to remove the shingles, would I need to place latticed boards to keep the steel roof off the plywood to provide room for air movement? I’d use whatever underlayment is approved for the steel, but looking at a lot of your posts and comments, it’s got me wondering if I’m better off just going back to asphalt shingles instead and saving a lot of extra work.

I’m curious if in the case of placing the steel on the underlayment could cause some issues with condensation that may or may not make its way down the underlayment and off the roof. Would hate for any condensation to find its way into the plywood and become locked in causing rot. SETH in GRAND FORKS

DEAR SETH: Let’s start by looking at downside of shingles – https://www.hansenpolebuildings.com/2015/03/shingle-warranties/ and from Tim Carter https://www.hansenpolebuildings.com/2018/10/ask-the-builder/

For condensation to occur on underside of steel roofing, warm, moist air from your attic must be able to come in contact with roofing. Your plywood with an appropriate underlayment provide a thermal break keeping this from happening. You do want to make sure you have adequate eave and ridge ventilation https://www.hansenpolebuildings.com/2018/03/adequate-eave-ridge-ventilation/

Here is an actual “how I did it” story for you: https://www.hansenpolebuildings.com/2018/06/how-to-install-a-steel-roof-over-shingles/

 

DEAR POLE BARN GURU: I’m replacing my screwed down corrugated steel roof because the installer kinked the metal in a few places. Can I use the same double bubble vapor barrier or must i replace the vapor barrier too? It has a few holes in a few places in addition to the staple holes they made when applying it. JAVO in PRINCE FREDERICK

DEAR JAVO: Double bubble or other reflective radiant barriers only work to control condensation when they are 100% air sealed. You would be money ahead to order your replacement panels with an Integral Condensation Control factory applied and throw away your old double bubble. Please read more here: https://www.hansenpolebuildings.com/2020/09/integral-condensation-control-2/

This entry was posted in Insulation, Ventilation, Pole Barn Questions, Alternate Siding, Pole Barn Design, Building Styles and Designs, Building Interior, Roofing Materials, Columns, Constructing a Pole Building, Pole Barn Planning, Trusses and tagged , , , , , , , on by .

Condensation Control, Load Requirements, and A Sloped Site

This week the Pole Barn Guru answers reader questions about condensation control in Spokane, WA, the availability of a hipped roof design to meet wind and snow loads, and planning for a post frame build on a sloped site.

DEAR POLE BARN GURU: I’m in Spokane, WA– a semi-arid region, and I had a question about using metal roof panels with prefabbed integral condensation control, such as Condenstop, along with a double bubble reflective barrier. I have a few left over rolls of the reflective barrier that I can use and would only need to buy an extra roll or two for our prospective 36×36 post frame building. Would it be ok to use both without trapping moisture between the 2? Or, should I only use 1? Building will have continuous soffit venting on both eaves and ridge venting as well. The building will be used in-part to store food-crop and will be temperature-controlled during all seasons, and has drywalled ceilings. Therefore, I’d like to insulate to the max. Was thinking spray foam between the purlins and also fiberglass batts? MATT in SPOKANE

DEAR MATT: I was born and raised in Spokane, owned a house on Newman Lake until just a couple of years ago. In the 1990’s I was the area’s most prolific post frame builder – one year we erected over 200 post frame buildings in Spokane county alone!

Let’s look at doing this right, and not spend money just to spend money.

Spokane is Climate Zone 5A. 2021 International Energy Conservation Code requirements (IECC) are R-60 roof, R-30 walls

Roof: 16″ raised heel trusses, vent overhangs and ridge in correct proportion, roof steel with Integral Condensation Control, blow in R-60 of granulated Rockwool.

Sell your reflective barrier on Craigslist or Facebook Marketplace.

Walls: Steel siding, Weather Resistant Barrier (Tyvek or similar), 2×8 commercial bookshelf girts, R-30 Rockwool batts, well-sealed vapor barrier.

 

DEAR POLE BARN GURU: In your blog you state that hip roof style the strongest against high winds. as I live in tornado alley wind and snow drifting are concerns of mine and would like my building design to be highly resistant to these forces. Why can I not find examples of this roof style on your web site? Is the gambrel style the closest you come to this design? CARY in RAYMOND

building-plansDEAR CARY: Very few clients have been willing to make an extra investment into full hip roofs, explaining why our website has no photos of them (we do rely upon our clients to provide photos). We can engineer traditional (and most cost effective) gable roof designs with wind speeds in excess of 200 mph. Our Building Designers can incrementally adjust design wind speeds to allow you to make decisions to best meet your concerns and budget.

While most roof truss manufacturers meet Code requirements for unbalanced (drift) snow loads, we are one of few (if not only) building providers who also design roof purlins appropriately to resist these same loads. This typically results in purlins closest to ridge to be either more closely spaced and/or larger in dimensions.

 

DEAR POLE BARN GURU: We purchased property in north central Tennessee and are planning a post frame barn for a RV and SUV storage and then later adding a post frame home as our forever home. Building site has about a 5 – 10 degree slope. Can you recommend some reading material, books, articles, how-to’s that I can learn and start making some educated research and decisions? thanks. JEFFREY in PRAIRIEVILLE

DEAR JEFFREY: A plethora of options are available for sloped sites. They can be excavated to create a “walk-out” or “daylight” situation. I was faced with this situation on one of my personal buildings (albeit with a more extreme slope): https://www.hansenpolebuildings.com/2019/05/solving-massive-pole-building-grade-changes/
Sites can also be built up: https://www.hansenpolebuildings.com/2020/01/supporting-fill-when-considerable-grade-change-exists/
And there is always an option of “stilts” https://www.hansenpolebuildings.com/2020/03/stilt-home-barndominium/
For research, a great source of information is always to navigate to www.HansenPoleBuildings.com, go to SEARCH in upper right corner, type in whatever topic you are looking for information on (e.g. BARNDOMINIUM) and hit ENTER. Over 2000 articles are available, covering a broad myriad of subject matter.

Whatever route you do ultimately pick, fully engineered post frame is likely to be your most cost effective and energy efficient structural design solution.

 

 

This entry was posted in Ventilation, Building Interior, Insulation, Pole Barn Questions, Roofing Materials, Pole Building How To Guides, RV Storage, Pole Barn Planning, Pole Barn Structure, Post Frame Home, Steel Roofing & Siding and tagged , , , , , , , on by .

Condensation Issues, Adding a Loft, and Metal Truss Load

This week the Pole Barn Guru discusses issues with condensation in a new building, advice for adding a loft, and achieving a roof load for prefabricated metal trusses.

DEAR POLE BARN GURU: Hello, I have a new construction pole barn that I recently had put up. The building is used to primarily house animals. When I had it put up I was told I would have to condensation issues with eave vents and a ridge vent that would extend the whole length of the building. The dripping really bothers me and I was wondering if there is a good option of putting a barrier of some sort on the bottom side of the purlins? My rafter spacing is 8ft. THOMAS in NEW SALEM

DEAR THOMAS: In most instances eave and ridge vents are inadequate alone to prevent condensation. Contractors who fail to include some sort of thermal break between roof framing and roof steel are doing a severe disservice, in my opinion. It is so easy to accomplish at time of construction with products such as a Reflective Radiant Barrier or Integral Condensation Control. There is not a good option for an underside of purlins vapor barrier, as it is nearly impossible to adequately seal it. Your only real solution, at this point, would be to use two inches of closed cell spray foam on underside of your roof steel.

 

DEAR POLE BARN GURU: My wife and I are building our post frame building ourselves. We’re building a loft living area on 1 end which I’m using 11.875 x 2.5 x 20′ long I-joist 16″ center.

My question is, My 6×8 posts are 8′ centers, can I attach a single 2x12x8′ between these posts and attach the I joist hangers to this to support the floor or will I need to double them like a header?

Thank you ALLAN in FORT ATKINSON

DEAR ALLAN: Any lofts, second or third floors being added to post frame buildings should only be done so under design of a Registered Professional Engineer – ideally whomever was Engineer of Record for your original sealed building plans. Rarely do concrete footings below building columns have adequate thickness or diameter to support additional loads being implied to columns. In most instances, beams for support of floor joists, I joists or prefabricated floor trusses will be limited in capacity by deflection, rather than ability to carry a given load. I can guarantee a single 2×12 is inadequate to support your I joists.

Your engineer will also determine proper number and size of fasteners to support beam to column attachments. At a minimum, with a 50 pound per square foot total floor load, columns every eight feet and a 20 foot span, each connection must support 4000 pounds of load.

Please, I implore you, do not attempt this floor design without proper engineering guidance – it could be lifesaving.

 

DEAR POLE BARN GURU: We are building a pole barn that is 20 by 32 with 8ft spacing. We are using steel trusses for this project, but our roof load for this county is 120lb per square ft., so how do I achieve this or how many trusses I would need to put in? Any help would help thank you. CHRIS in EMMETT

DEAR CHRIS: You should reach out to whomever provided your trusses to get an engineered repair. You should be able to have additional members welded onto what you have in order to meet required loads. On larger spans, this type of repair might not be possible.

 

 

This entry was posted in Trusses, Ventilation, Building Interior, Lumber, Columns, Pole Barn Questions, Pole Barn Design, Lofts, Constructing a Pole Building, Pole Barn Planning and tagged , , , , , , , on by .

Roof Insulation, Pole Barn Houses, and Adding Heat

Today the Pole Barn Guru tackles reader questions about the best method of insulating a building with no plans for a ceiling, planning a pole barn house, and adding heat to a completed post frame building.

DEAR POLE BARN GURU: I am insulating my 30×50 pole barn that is wrapped with Tyvek outside the purlins and I will use faced batt insulation on the 10ft walls. I will have it heated in the winter with the gable vents and cupola closed when working, but will not cool it in summer months. My question is what is the best method to insulate the roof as I don’t plan to add a ceiling? Currently, there is a radiant barrier on top of the roof purlins directly below the metal, and the only venting is the cupola and two gable vents. ERIK in FESTUS

DEAR ERIK: Without a ceiling I would have recommended two inches of closed cell spray foam applied directly to your roof steel – except you have a radiant reflective barrier in place (not a best thing to spray foam to). This method also means it would be nice and toasty between your trusses, but not so much in your working area.

Provided your roof trusses are capable of supporting weight of a steel liner panel ceiling, I would encourage you to consider it as an option, then blow fiberglass insulation in above liner panels. Alternatively, you could use lathe, wire mesh, or other means across bottom of trusses and place unfaced batt insulation on top.

 

DEAR POLE BARN GURU: I would like to know about building a pole barn house. 3 bed 1.5 to 2 bathroom. If I order from you do I build it of you? How much do they cost? DAVID in KALKASKA

DEAR DAVID: This article should get you started https://www.hansenpolebuildings.com/2021/02/a-shortlist-for-smooth-barndominium-sailing/

 

DEAR POLE BARN GURU: Heating an unvented barn? I have a 52×70 Hansen pole barn. I have decided I would like to heat the space. I have sealed the concrete and have spray foamed the walls with 2.5″ closed cell and blocked the soffit vents while doing this. I will be using a combo of a waste oil furnace and a wood stove to heat the space. My question is can I block off the gable vents instead of putting in a ceiling? Will I have moisture issues if I do this? I did use the foil insulation between the roof sheeting and the purlins that came with the package. Thanks. MARSHALL in CAMANO ISLAND

DEAR MARSHALL: Please keep in mind the Reflective Radiant Barrier under your roof steel is a thermal break designed to control condensation from occurring on underside of your roof steel, it is not insulation and has a R value of roughly one (R = 1). If you block off all vents, you may need to mechanically dehumidify your space in order to reduce moisture inside. Alternatively, should you install a ceiling and insulate above it, you would need to appropriately vent dead attic space to prevent roof system mold and mildew.

 

 

 

 

This entry was posted in Ventilation, Insulation, Pole Barn Homes, Pole Barn Questions, Roofing Materials, Barndominium, Pole Building How To Guides, Pole Barn Planning and tagged , , , , , on by .

Condensation Control, Mother/Daughter Addition, and Vapor Barrier for Roof

Today the Pole Barn Guru answers readers questions about condensation control in a small garage with a gravel floor, the possibility of adding a “mother-daughter” unit to her house, and “ribbed vapor barrier” for a shed roof.

DEAR POLE BARN GURU: Recently purchased a metal garage kit, 24X26. No insulation. Two garaged doors. Gravel floor with plastic under grave. I am getting condensation on some days, that makes my cars, etc have like a dew on them.

My rib looks to be 1” and 7” between ribs. How do you install a wall vent with the ribs? JODY in ALTON

Machine ShopDEAR JODY: First step is to take care of your source. Pour a concrete slab on grade with a well sealed 10-15mil vapor barrier underneath. As you have no thermal break between your warm moist air inside building and roof steel, have two inches of closed cell spray foam insulation applied to underside of roofing. You would be better served to vent eaves and ridge, than just gable vents. If gable vents are your choice, look for vinyl vents with a snap ring as they can be installed on ribbed steel siding.

Using inward vent base edges as a guide, mark area to be cut on endwall steel INSIDE, make hole cut square with steel sheet (vertical cut lines parallel to steel ribs). Cut hole with appropriate tools.
Push vent base through hole in steel from inside.
Note word “TOP” on base when positioning. Vents installed with top side in any direction other than up will allow water to leak into building.
While holding vent base in place, snap face into base from steel exterior by pressing firmly (this takes two people).

 

DEAR POLE BARN GURU: I’m interested in building an attached mother/daughter addition to my home. Do you have plans for that? Approximately 600-700sq ft. NANCY in MONROE TOWNSHIP

Floor PlanDEAR NANCY: Thank you for your interest in a new Hansen Pole Building. Every building we provide is custom designed to best meet the wants, needs and budget of our clients. We offer a floor plan design service for folks just like you: http://www.hansenpolebuildings.com/post-frame-floor-plans/?fbclid=IwAR2ta5IFSxrltv5eAyBVmg-JUsoPfy9hbWtP86svOTPfG1q5pGmfhA7yd5Q 

 

DEAR POLE BARN GURU: We are having a 50×30 all metal building. We were advised to get ribbed vapor barrier for roof. We have searched everywhere. Is it called something else? SHANNON in OLEAN

DEAR SHANNON: We are also not familiar with any product known as a “ribbed vapor barrier”. We would normally recommend use of roof steel with an ICC factory attached (https://www.hansenpolebuildings.com/2020/09/integral-condensation-control-2/). If this is not an option (or if you are using closed cell spray foam directly to underside of roof steel), next choice would be a radiant reflective barrier – look for six foot wide rolls with an adhesive pull strip attached for ease of installation.

 

This entry was posted in Pole Barn Planning, Post Frame Home, Ventilation, Concrete, Insulation, Pole Barn Homes, Pole Barn Questions, Roofing Materials and tagged , , , , , , , on by .

Seal Walls, Fill for Compaction, and Condensation Control

Let’s close out the week with another installment of Ask the Pole Barn Guru! First up is a resolution to seal up a building, followed by assistance with compacted fill, and finally an alternative to spray foam to control condensation.

DEAR POLE BARN GURU: I purchased a pole building from you last year and there was an error that I wanted an insulated building. So I will be insulating this myself. What keeps all the drafts and bugs out at the roof eve and lower edge of side panels? I am doing house wrap on the exterior walls. MARK in MOUNT VERNON

DEAR MARK: Communication – we as humans do so much of it and all too often do not fully convey our intentions. I am just as guilty as any other person, so do not feel like you are alone in this. This is one reason we strive to do everything in writing, so both parties are clear on each other’s expectations.

 

Also, successful construction is not measured by how perfect things went initially, but rather by how challenges are solved to arrive at a great end result.

Your roof eaves should be sealed with inside closures, provided with your building package, to install between fascia board and roof steel, so should not be an issue there. If you have not yet installed siding, same inside closures can be placed at bottom of walls, on top of your Weather Resistant Barrier to keep any little critters from entering steel high ribs in your 1/4 inch space between base trim flat and bottom edge of wall panels.

 

DEAR POLE BARN GURU: I’ve worked with a Hansen Building Designer, ordered my building, and materials will start arriving in two weeks. Looking forward to it, but also a little bit ‘trepidated,’ as it’s my first post-frame build (I completely remuddled a 100 year old farm house at our last place, so that’s what I have for previous experience).

My question has to do with the compacted fill that goes onto my cleared site after the poles are concreted in. Is crusher run gravel appropriate, or is a different type of gravel recommended for better drainage (I’m not familiar with the options, so please be specific if so)?

Also, please see the attached photo of the cleared site along with a drawing I created based on what I *think* are the correct dimensions based on reading the Construction Manual and a number of your blog posts. Note that I’m planning on a 5″ thick concrete floor, and have indicated same in the drawing at exactly 5″. ED in SUMMERTOWN

DEAR ED: Awesome drawing! You should have no difficulties in assembling your own beautiful building, as I can tell you are already reading directions!

Crusher run should be adequate for your sub-base. Most important is to get any clay removed from within upper levels of your grade and to have good compaction. Top two to six inches of your fill should be clean and drained sand or sandy gravel, again well compacted.

Photos: https://hansenpolebuildings.com/uploads/polebarnquestions/7bea6f6c3d75e192515b8bd12303c72c.jpg
https://hansenpolebuildings.com/uploads/polebarnquestions/5ccc84929f35cf3f29da7f8849defaa1.jpeg

 

DEAR POLE BARN GURU: If not spray foam on the underside of metal roof then I saw you recommend reflective siding insulation. Would that suffice in lieu of spray foam?

DYLAN in BEDFORD

DEAR DYLAN: My first alternate choice would be to use an I.C.C. (Integral Condensation Control) https://www.hansenpolebuildings.com/2020/09/integral-condensation-control-2/ easy to install and no seams to worry about. Next choice would be a Reflective Radiant Barrier – we have it in six foot wide rolls with an adhesive pull strip to seal joints. Contact Materials@HansenPoleBuildings.com for delivered pricing (rolls are 128′ long).

 

 

 

This entry was posted in Ventilation, Concrete, Insulation, Pole Barn Questions, Pole Barn Planning and tagged , , , , , on by .

Installing Insulation, Properly Treated Posts, and a Slab Solution

The Pole Barn Guru helps with installing insulation in wet seasons, properly treated posts, as well as a solution to embedded posts when bedrock is present.

DEAR POLE BARN GURU: Hello. I am ready to install the insulation and metal on our pole building’s roof. I remember reading how it is important to install the insulation and roof when things are dry as to keep the insulation dry. We have recently moved into a rather wet early fall, and dry weekend days have seemed very illusive.

Do you have any expert ideas or advice that you may be able to offer us? I appreciate all of the very useful help and insight you’ve provided us numerous times already! BRAD in MOUNT VERNON

DEAR BRAD: You want to avoid trapping water between Radiant Reflective Barrier and roof steel, as it can lead to premature deterioration of roof steel.

A helpful hint – in rainy weather only place one run of barrier and if upward surface gets wet, towel dry it and immediately install steel roofing to cover.


Just one reason I now recommend using roof steel with an Integral Condensation Control: http://www.hansenpolebuildings.com/2017/03/integral-condensation-control/.

DEAR POLE BARN GURU: Opinion in using 9” x 25’ class #3 pressure treated utility poles as columns or posts? I have come across a grip of poles in coastal pacific Mexico. Pondering the use of them as my columns/posts in cabin and deck style construction. Their structural and dimensional properties suited for use as such? Thank you. CARL in ZIHUATANEJO

CARL: I personally would not want to use them as level of pressure preservative treating (as well as chemicals used) could very well be iffy at best, toxic at worst. Read more about utility poles in post frame construction here: http://www.hansenpolebuildings.com/2012/11/used-utility-poles/.

 

DEAR POLE BARN GURU: 26’ x 42’ pole barn planned. We hit rock 6” down. Builder now wants to consider option of to pour the 4” slab first and use post saddles to anchor the posts on top of the slab. He says “This is a good option and results in longer life of the treated posts. Included in this option is additional bracing on each post” Is this really a viable option???

Help! Thank you. VICTORIA in FAIRVIEW

DEAR VICTORIA: Unless your builder can provide engineer sealed plans for your building including his “solution” fire him now because he has no clue.

Why do I say this? A four inch thick concrete slab only will provide inadequate to mount a building to.

In photo of correct bracket below, concrete would need to be deep enough to have rebar entirely embedded in concrete:

 

While a properly pressure preservative treated column will last longer than any of us will be alive to witness, of course if it does not touch ground it eliminates potential of any decay due to ground issues.

Read more here: http://www.hansenpolebuildings.com/2016/12/attacking-pole-barn-rocks-holes/.

 

This entry was posted in Concrete, Footings, Insulation, Roofing Materials and tagged , , , , , , on by .

Pole Barn Bid, A1V Barrier, and Definitions

DEAR POLE BARN GURU: I am bidding on a simple 80×140 pole barn with 12′ sides. I can’t come up with something reasonable. What would you bid. I need help. Last time I did it wrong and it hurt financially. Thanks. JASON in MINBURN

DEAR JASON: As you probably found out on your last post frame building project, they are far more than just simple barns, especially when they get to this sort of footprint. Our buildings will not be the least expensive, as there is always going to be someone out there who is willing to sacrifice quality for price. What you will get is the best possible building value for your investment. You will be hearing from one of the Hansen Pole Buildings’ Designers shortly.

DEAR POLE BARN GURU: So I decided to put up a pole building for a garage. I bought a standing roof kit, 30×50 with 12″ eaves and steel trusses that are arched in the middle of the building, for future dreams of having a car lift. My trusses have brackets welded on them for my 10′ 2×6 purlins to run in. My question is, do I need some sort of vapor barrier in between my metal roof and my purlins? My purlins run horizontal, I plan to use vented soffit the whole way around the building, 2 gable vents, and it also has a ridge vent. I will frame inside underneath the lowest point of my truss and insulate above that. It will leave about a 16″ gap between my interior ceiling and the steel roof. Thanks for the help. BRYENT in OHIOVILLE

Reflective InsulationDEAR BRYENT: Yes – it is essential you have a vapor barrier between the roof purlins and the steel roofing. I would recommend using A1V (aluminum one side white vinyl inwards toward conditioned space. Hansen Pole Buildings has six foot net coverage rolls in stock for immediate shipment. These rolls have a tab on one edge which has an adhesive pull strip – so no rolls of tape to deal with.

Code does not allow for gable vents to be used in conjunction with eave and ridge vents. It is one or the other and I would pick eave and ridge for the most uniform ventilation.

DEAR POLE BARN GURU: What defines a pole barn? The last building I put up on my property is an all steel truss roof structure and the foundation has 3’x3’x3′ footings at each of the six columns. What is the foundation used? STEVE in PALMDALE

DEAR STEVE: Technically a “pole barn” is a post frame building. Below is the definition for a post-frame building system from ANSI/ASABE S618 Post-Frame Building System Nomenclature. This standard was written to establish uniformity of terminology used in building design, construction, marketing and regulation.

Lean Building“A building characterized by primary structural frames of wood posts as columns and trusses or rafters as roof framing, Roof framing is attached to the posts either directly or indirectly through girders. Posts are embedded in the soil and supported on isolated footings, or are attached to the tops of piers, concrete or masonry walls, or slabs-on-grade. Secondary framing members, purlins in the roof and girts in the walls, are attached to the primary framing members to provide lateral support and to transfer sheathing loads, both in-plane and out-of-plane, to the posts and roof framing.”

 

This entry was posted in Insulation, Pole Barn Questions, Pole Building Comparisons, Roofing Materials, Pole Barn Planning and tagged , , , , , , on by .

Roof Trusses? Contractor Reviews, and Insulation Installation!

DEAR POLE BARN GURU: I would like to rip off my current roof of trusses that are made of 2x4s 2 feet on center with new one of mono-pitched trusses that are every 4-ft or less on center. The roofing material on top of the new trusses would be a SIP panel of some sort. The unfinished ceiling would be the bottom of the SIP panel. The house would have exposed trusses to create a loftier feel as the ceilings are currently too low. (house is 28 ft wide by 30 feet long)

Is this something that you can help with — the design & manufacture of the trusses/roof?

Thanks! NATHAN in KIRKLAND

DEAR NATHAN: Your Building Department is going to require engineer sealed plans in order to issue a building permit for your project. As such, your best bet is to hire a local engineer who is experienced in wood frame construction to provide your plans. They should come out to your house and do a thorough investigation into the adequacy of the structure to support the loads.

Some thoughts to consider – SIPs are going to prove to be very expensive. You could create a more spacious feel by constructing a knee wall on top of one of the existing walls, then use I joists or parallel chord trusses – either of which can be insulated between to give an adequate R value.

DEAR POLE BARN GURU: How can I find independent customer reviews in Washington state for Pride in Construction. GINGER in TACOMA

DEAR GINGER: Getting independent customer reviews on any building contractor anywhere is a challenge, as most builders do not construct enough buildings to develop much of a track record either good or bad.

Here are the seven steps to not getting yourself burned by any contractor, follow these: https://www.hansenpolebuildings.com/2013/07/contractor-6/ and require a performance bond and you will greatly limit your risk of not getting the finished product you expected. Here is Performance Bond information: https://www.hansenpolebuildings.com/2012/07/contractor-bonding/.

 

DEAR POLE BARN GURU: I will be installing insulation under the steel roof. Are staple guns the best choice for temporary stabilization until the roof is added? What length staples? Which gauge staples? Narrow? Electric, air or grip staple gun? Recommendations? I will be using metal tape to join each roll of insulation side-by-side.

Trying not to re-invent the wheel, that’s why I went Hansen of course. RALPH in KENNEWICK

DEAR RALPH: From Chapter 14 of the Hansen Pole Buildings’ Installation Guide: Using a minimum 5/16” galvanized staple, staple through insulation to eave purlin top. As an alternative to staples, 1” galvanized roofing nails (with the big plastic washers) also work well.

These fasteners are only going to be needed long enough to get a sheet of steel on top of them, so there is no occasion to get fancy at this juncture. I’ve found a tack hammer to be more than adequate.

Keep in mind, the one edge of each roll of A1V insulation has a pull strip on it, with adhesive under the pull strip. This eliminates the need to use rolls of tape to adjoin each piece of insulation.

 

This entry was posted in Professional Engineer, Insulation, Pole Barn Design, Building Department, Pole Barn Structure, Trusses and tagged , , , , , , , , on by .
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