Forgot How To Square Up A Foundation

 
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Old 07-02-2011, 07:30 AM   #1
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Forgot How To Square Up A Foundation


I forgot how to square up a foundation and can not find my notes on this topic. Its been a while since I did this. Real busy you know
the foundation is 24 x 32
a/b is 24
c/d is 24
a/c is 32
b/d is 32
how do I get the a/d and b/c criss cross meassurement to square the foundation?
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Old 07-02-2011, 07:35 AM   #2
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Re: Forgot How To Square Up A Foundation


Pythagorean Theorem

All the diggers I know use lasers...

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Last edited by TimelessQuality; 07-02-2011 at 07:40 AM.
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Old 07-02-2011, 07:39 AM   #3
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Re: Forgot How To Square Up A Foundation


Quote:
Originally Posted by burntside bob View Post
I forgot how to square up a foundation and can not find my notes on this topic. Its been a while since I did this. Real busy you know
the foundation is 24 x 32
a/b is 24
c/d is 24
a/c is 32
b/d is 32
how do I get the a/d and b/c criss cross meassurement to square the foundation?
a+b=c

24+32=c

576+1024=1600

Sqr. root of 1600 is 40.



Or, you could just measure all four sides to verify the pairs are equal (a-b and c-d are both 24, b-d and a-c are both 32) then measure both diagonals and see if they (a-d and b-c) are equal.
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Old 07-02-2011, 07:48 AM   #4
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Re: Forgot How To Square Up A Foundation


Quote:
Originally Posted by 480sparky View Post
a+b=c

24+32=c

576+1024=1600

Sqr. root of 1600 is 40.



Or, you could just measure all four sides to verify the pairs are equal (a-b and c-d are both 24, b-d and a-c are both 32) then measure both diagonals and see if they (a-d and b-c) are equal.


Right on Sparky, pretty old school , but it works all the time.
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Old 07-02-2011, 08:04 AM   #5
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Re: Forgot How To Square Up A Foundation


Get a calculator and it will tell you what the diagonal should be when you give a length/width.
Depends on the size we normally do smaller addition foundations, so the mason squares it up good, but when we build the deck. I use the 3,4,5 or 6,8,10 method of squaring, usually it's attached to a house, so you can't always go off the corner to corner as there aren't 4 perfect corners.
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Old 07-02-2011, 09:54 AM   #6
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Re: Forgot How To Square Up A Foundation


Quote:
Originally Posted by 480sparky View Post
Or, you could just measure all four sides to verify the pairs are equal (a-b and c-d are both 24, b-d and a-c are both 32) then measure both diagonals and see if they (a-d and b-c) are equal.
Yes. No calculation involved.

If the diagonals are not equal within reasonable tolerance limits for this kind of project then you'd have to measure each angle to find the problem.
For a home-built picture frame, diagonals equal to each other within 1/16" is probably OK so I'd think acceptable tolerances on something this large could be +/- 1" or so. Civil engineers using steel tapes actually correct for tape sag, tape tension, and the effect of ambient temperature on the length of the tape.

Maybe the building codes or housing inspectors say something about this.

Last edited by GettingBy; 07-02-2011 at 10:09 AM.
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Old 07-05-2011, 08:43 AM   #7
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Re: Forgot How To Square Up A Foundation


Quote:
Originally Posted by ApgarNJ View Post
Get a calculator and it will tell you what the diagonal should be when you give a length/width.
Depends on the size we normally do smaller addition foundations, so the mason squares it up good, but when we build the deck. I use the 3,4,5 or 6,8,10 method of squaring, usually it's attached to a house, so you can't always go off the corner to corner as there aren't 4 perfect corners.
X2, quickest and easiest method.
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Old 07-05-2011, 11:28 AM   #8
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Re: Forgot How To Square Up A Foundation


In the bind, a simple 3/4/5 in multiples will suffice.

Meaning

6/8/10
9/12/15

etc. Or in your case

24/32/40 as sparky states.

The last number means your diagonals. First two your sides and front/back measurements.

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