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-   -   Post and beam spread footings and future plans (http://www.diychatroom.com/f19/post-beam-spread-footings-future-plans-86984/)

WillK 11-17-2010 04:12 PM

Post and beam spread footings and future plans
 
So, thinking ahead to an upcoming project to implement the addition of spread footings, 6x6 posts and triple 2x10 beams, my understanding and the way the footings are specified is that these are 24"x24"x16" deep concrete poured pads - A spread footing is allowed where it doesn't have to go to the 42" frost line depth because it is under a crawl space where it isn't exposed to weather.

Where I'm thinking ahead, beyond this project I intend to have a foundation wall put in around the perimeter to support the exterior walls directly. The posts and beams are specified to be one foot inboard of the perimeter, and with 24" pads that would put the edge of the pads at the perimeter. This wall will go to the frostline depth, so the soil supporting the footings - it seems to me - would be at risk of collapsing.

More than likely, the later foundation wall job will be done professionally, but I want to understand if anything I'm doing now will impact this later project and if anything can be done to make it easier later or if there are ways of working around what I'm doing now that mean the later wall will go in without any issues.

Bondo 11-17-2010 04:29 PM

Quote:

The posts and beams are specified to be one foot inboard of the perimeter, and with 24" pads that would put the edge of the pads at the perimeter. This wall will go to the frostline depth, so the soil supporting the footings - it seems to me - would be at risk of collapsing.
Ayuh,... I'd have to agree with that,...
How can you dig it, 'n form it with those in the way,..??

Sounds like the cart is leading the horse...

WillK 11-18-2010 12:20 AM

So if I go ahead with the post and beam configuration with the spread footings, later when I do a foundation wall around the perimeter I'd have to support the beams with some sort of temporary structure (such as perhaps each post gets replaced by a mini-beam supported on each end so the mini-beam can bridge the excavation and rest on ground that is far enough away from the excavation that it won't collapse?) so the posts and footings could be removed for the excavation? Or something along those lines?

I mean... it's not as important the particulars of how it can be done, rather the question is that a work-around is needed but work-arounds exist?

Heck, I might need to watch how the post and beam project turns out, it's possible I might get a good result and leave well enough alone. Now that I've worked with the house, I think I'm learning that some of the uneven floor issues aren't sag, bend or warp related but... for example, the kitchen floor rotted out and was replaced with new 2x6 joists (where the original lumber was 2x6 that was actually 2" x 6") and on top of that was placed a layer of 2x6 boards, over which was placed another layer of 2x6, over which was placed a layer of plywood, over which there was yet another layer of plywood.

On the other hand, there are some legitimate crowning issues, which I think is actually an area where the house is jacked up too much unless the entire remainder of the house happenned to drop uniformly.


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