squaring a frame

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I want to build a utility building & what i would like to know if i built a 12' wide16' long  or a 10' wide18' long what would the diagonal measurements be for making sure it was square.thanks
Reply:If the diagonal measurements are the same, on opposite corners, it's squareJust tape it, and adjust it until the measurements are identical at opposite corners"Any day above ground is a good day"http://www.farmersamm.com/
Reply:like this Attached Images"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Once again the 3-4-5 rule works for the intial setup. The 1st corner dictates how easy the rest are going to be. Measure the diagonals once you get all four corners to verify the accuracy of the work done.
Reply:Get the "Construction Master IV " calculator for around $50 or much cheaper on ebay, Well worth it and can quickly tell you. Makes most calculations even in fractional amounts. You can punch in numbers Like 5 FT 6 1/4 inches + 2 FT 3 3/64. Has a feature just for diagonals."Si Vis Pacem Para Bellum"Lincoln Idealarc 250 AC/DCMillermatic 251   Syncrowave 300   30A spoolgunLincoln MP210Hypertherm 45(2) LN 25(2) Lincoln Weldanpower 225 CV(4) SA200   1 short hood    SA250    SAM 400
Reply:Pythagorean theorem  The 12X16 has a diagonal of 20 feet, and the 10X18 has a 20.59 foot diagonal.Tim
Reply:Sam nailed itDavid Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Samms way is how I have always done it!For whatever size you make this:First make darn sure your 4 pieces used for the 2 sides and the front and rear match in size/length, if the 2 side rails or the front and back rails don't match in length, it will never be square, then line them up in their respective places, measure as samm has shown in his diagram, when the corners match in length clamp it or tack it or both and there you go "square"!#1. If you don't like what I wrote, or if it offends you, then don't read it!#2. I am living life the way I see fit, if you don't like the way I'M living, tough sh**!
Reply:What farmersamm said.  When you tack it together make your tacks in locations that will be easily accessible to cut them later when you are squaring the frame.  Tacks need to be strong enough to hold it together, but they also need to allow for enough movement to achieve squareness.  They also need to be in locations that allow for movement in the necessary direction, as the tacks act as hinges when you're adjusting square.  There are a number of ways to adjust the frame, everything from a come-along to clamps to a few whacks with a big hammer.  I generally use a 24" framing square as I'm tacking the pieces together, just to get it in the ballpark.  Once everything but any sort of diagonal bracing is in place, I square across the diagonals, then tack  securely to hold everythign in place.
Reply:just measure in 3 spots or even two across the frame and come out with the same # and its square
Reply:One thing I might add. When you first set the building lines as stated above you first need to get all the sides equal. Then when you get you are shooting for the square you will have to move the two building lines Opposite each other equal amounts as you shoot for square as you already had this dimension to make the sides equal. In other words, if you move one line 2 inches then the other opposing line will have to be moved two inches for square. The two lines you move will be on the same side of the building line at opposite corners. When the diagonals are equal and the sides are the same it is square. If you don't do it this way you will be out there a long time.
Reply:I didn't mention that I have found the cloth like tape to be the best for this work. You don't have to pull on it as hard to take up the slack. Also I do what I call cut it a foot or so. This gives the man with the free end enough tape to wrap around his hand so it is easier to hold. This lets him measure from the one foot line or the two foot line what ever to make it easier to hold. It doesn't matter as long as the diagonals are equal. Squaring up the buildings is a two people job for sure.