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Old 05-08-2008, 05:42 PM   #1
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I want to construct a "lean too" on the front of an existing bldg. In order to keep my posts in line and square, would the 3-4-5 rule apply? I think thats what it is called. Getting away from the geaky math stuff, it simply means that if you measure 3' out from the corner in one direction, and 4' out in the other direction, the line between the two points should be 5'. Is this the best way to square up my posts?

Am i correct here or am I wayy of base?? Any other suggestions on how to square everything up

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Old 05-09-2008, 08:03 AM   #2
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3-4-5 triangle or any other number you choose. Pythagorean Theorem states that lengths of the sides of a right triangle will always be calculated like this: A squared + B squared = the square of C. In this case 3 squared = 9 + 4 squred = 16. 9+16=25, the square of which is 5. The 3-4-5 triangle will work to square your layout. I tell you the theory because in most cases you can get a lot more accurate by measuring the entire layout, rather than just a 3 foot x 4 foot section. A plumb line will keep everything vertical.

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Old 05-09-2008, 08:10 AM   #3
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Use the largest multiple of 3-4-5 to get you square from the building (6-8-10...). The diagonal measurements should also be equal.
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Old 05-09-2008, 05:58 PM   #4
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Thanks. Thought I was on the right track, I will go with the larger ones, 6-8-10. I have to run out 10 foot from blg, so this will be great for me before I set my posts. Thanks!!

Mike
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