Your structure may be good enough to do so already, but it's definitely necessary to evaluate things before making such a big change. Typical column designs resist only compression/tension because the roof structure is rigidly designed at the eave connection, meaning the column footing connection doesn't have to resist bending like that. You need to do more than bolt your post to the concrete to "convert a pole barn" to a "permanent one with footings under the columns". Typical pole barn structures don't have the bracing or eave connections to handle this. Or of the post to not break under lateral forces at the bolt holes. With the posts cut off and bolted to the concrete, you're now relying not on the bending strength of the post, but upon the pullout strength of the bolts and concrete being jerked to the side. Having the post buried in the ground means the strength of the post to resist bending is what keeps the building from being pushed over. Thus you convert a temporary pole-building to a permanent one with footings under the columnsAnd you just turned a fixed connection (to to the ground) that resists a moment/bending force into a bolted connection that isn't good at that. Later at leisure I would make plate-footed brackets to secure the poles to, saw the poles off and slide the brackets under and bolt the brackets to the footings you have created,and poles (now columns) to the brackets. I think I would actually dig out cavities perhaps 30" square and 24" deep around each pole, lay whatever re-bar mat you want for your slab, then pour, filling the cavities around the poles. Yes, we will be doing a vapor barrier under the concrete - but there will be 12 8x8 holes punched into that vapor barrier which could allow moisture up right into the part of the concrete pad that we don't want it - the part touching the poles.Īll comments and suggestions appreciated.
What is an appropriate barrier material to clad the bare poles in, and then pour concrete right up to, that will prevent moisture from collecting on the poles themselves ? I hear of people using styrofoam or expansion joint felt as a wrapping for their poles, but all of those discussions relate to avoiding cracks in the concrete from pole movement. I was just going to pour the concrete right up to, and around, the poles, but some folks have me thinking that the concrete directly on the wood will create a lot of condensation and moisture and eventually rot/weaken the poles right at the floor. We'd like to pour a concrete slab under the entire building (as it is dirt now). We have a 25 year old pole barn with 12 main 8x8 poles sunk 8 feet into the ground.
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