Poured wall contractor doesn’t work in fractions
TreeNate
| Posted in Construction Techniques on
Hey all,
Just recently spoke with a foundation contractor for poured walls that indicated they don’t work in fractions. So a wall length of 36′ 5 3/4″ would be 36’6′. Is that a common tolerance or something you all have heard of? He said that’s pretty standard across the board.
If that is the case, I’ve been thinking through what other dominos that could tip down the road or if it’s a negligible difference.
Thanks in advance!
Replies
The real question would be what the tolerance really is. Resistance to a fractional dimension may be related to the stock of concrete forms.
https://www.jlconline.com/how-to/foundations/q-a-foundation-and-framing-tolerances_o
above is a discussion of dimensional accuracy overall from 24 years ago.
https://www.amazon.com/Handbook-Construction-Tolerances-David-Ballast/dp/0471931519
More light reading.
I need to pick up a copy of that book. Thanks for the links!
I expect what he means is that he doesn't price fractions, not that he doesn't work in fractions.
Thats a good thought. I was a little unsure as well but he did in fact clarify that he's referring to the fractions on the measurements of the footers and foundation walls. I'm guessing the tolerance is such that at most it would be long or short by 1/2" depending on if they rounded up or down on say a 45' 4 1/2" wall.
The mud sill should be laid out to the plan, and not "fit" to the top of the foundation wall. This will bring the floor dimensions back to the plan dimensions. As long as the foundation is square, level, and within 1/2 inch of the plan you won't even notice the discrepancy.