Tag Archives: pole building framing

I Love Pole Building Photos

My wife, not so much – because she says I manage to pick out things which are wrong in nearly every one of them. Weirdly enough, when I do find errors, it is nearly always on buildings which have been constructed by “professional” barn builders. More often than not, when our clients do the work themselves – the pole building photos prove they followed the directions!

Weird?

Hardly.

I have made this statement repeatedly for years – the average building owner who can and will read instructions will construct a better finished building for himself, than most contractors will erect for them.

Read more about doing it yourself here: https://www.hansenpolebuildings.com/blog/2012/01/build-it-yourself/

We don’t make a fortune on the buildings our clients invest in. The little we do get paid for, is because we have spent decades going over minute details to make construction as easy as possible for the average Joe (or Jane) to arrive at a successful result.

pole building frameOne of those “maybe simple” things is the overall footprint of our buildings. In the photo is a partially framed 30 foot wide by 48 foot long building. When we measure those dimensions, it is from outside of column, to outside of column. All of the wall framing is to extend out 1-1/2” past the posts. Done correctly, the finished framework of this building will be 30’3” by 48’3”.

Why might this make things easier?

Steel panels have a net coverage of three feet (36 inches). They also have an overlap. This means 10 sheets of steel will cover approximately 30’2”. The Hansen Pole Buildings Construction Manual has the first panel of wall steel starting ¾” outside of the pole, so at the far end of the wall, the last panel of steel does not have to be ripped to fit. So much easier to avoid the extra cutting!

Now, take a gander at the pole building photo. Look close – notice the wall girt framing does not extend out past the poles. Bookshelf girts, as described and shown in the Construction Manual and on a specific “blown up” detail on the plans, should project 1-1/2″ outside the building line. This client’s builder took it upon himself to disregard the building plans and instructions. He created a lot more work for himself, by cutting all of the 2×8 pressure treated skirt boards (https://www.hansenpolebuildings.com/blog/2013/08/composite-grade-board/) and headers to fit between the columns, instead of applied (more easily) to the outside face of them. He also ended up having to rip steel panels which would not have been otherwise cut lengthwise.

The Hansen Pole Building kit is the product of easily 100,000 pole buildings of experience. The great majority of folks follow the instructions and avoid extra work and pitfalls…..the few others, not so much!

Mind the Purlin Gap

Simpson Strong-Tie® has a blog dedicated to Structural Engineering. A recent post written by David Finkenbinder addressed gaps where a member is attached to another by use of a structural hanger.

Mind The GapHere is an excerpt from the blog:

“Have you ever seen this famous sign? You may have seen it while riding the London Underground, to draw attention to the gap between the rail station platform and the train door. The warning phrase is so popular that you may also recognize it from souvenir T-shirts or coffee mugs.

In the connector world, the phrase comes to mind when thinking of the space, or “gap” between the end of the carried member and the face of the carrying member. Industry standards for testing require that a 1/8” gap be present when constructing the test setup (in order to prohibit testing with no gap, where friction between members could contribute significantly), so this is the gap size that is typically permitted for the joist hangers listed in our catalog.

Gaps exceeding 1/8” can affect hanger performance in several ways. A larger gap creates more rotation for the connector to resist by moving the downward force further from the header. Fasteners may also have reduced or no penetration into the carried member due to the gap. Testing confirms that these factors decrease hanger allowable loads for larger gaps.”

In pole buildings where roof purlins are attached to either metal plate connected wood trusses or rafters with hangers, other issues can also result from gaps.

When screws are driven through roof steel and the points end up in a gap – leaks can result. If, as we recommend, all of the purlins have been cut to length in advance, gaps create an overall length “creep” in the roof. This can cause waves in the end truss or rafter (if no end overhangs are present) or fly rafter with an end rafter.

With some prudence, gaps can be avoided.

Make sure both ends of purlins are cut square. While lumber cut at the mill is supposed to be square at each end, there are exceptions. In almost all cases the purlins need to be trimmed to length, so each end can be cut back, if needed.

Even with perfectly square cut purlins, it is essential they are placed in the hangers so each end is tight to the carrying member. It is easiest to fasten the same end of all purlins, then use a come-along to pull the other carrying member tight.

Avoid the Gap – keep everything tight and the overall result will be satisfying both aesthetically and structurally.