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 DIY Chatroom Home Improvement Forum Out of square deck

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06-01-2012, 08:27 PM   #16
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Quote:
 Originally Posted by Jay bird My measurements on my deck are all the same except my diagonal any ideas

Quote:
 Originally Posted by no1hustler Split the difference. Using Pythagorean theorem, you should be able to find out what the correct measurement should be.
How is he going to split the difference which would make it square if an "equal" measurement is obtained in the out of square side(s)

Well why not give ( Jay) the actual numbers from that Roman Gift and not make him hunt

Jay, the magic numbers are 3.4.5 or 6,8,10, applied as such

Measure 3 feet one way. 4 feet the other way and from those two points it should be 5 feet across. Or, change to 6,8,10. You can use these numbers in 10 increments such as 3.4.5 in inches or 20 feet 40 feet and 5- feet at the 45 angel from those two points

Last edited by 21boat; 06-01-2012 at 08:29 PM.

06-01-2012, 09:11 PM   #17
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Quote:
 Originally Posted by GBrackins Jay, try this .... http://www.construction-resource.com...uare-forms.php
Jay, if you got to this link and enter the two side it will give you the diagonal
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06-02-2012, 12:21 AM   #18
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Quote:
 Originally Posted by GBrackins Jay, if you got to this link and enter the two side it will give you the diagonal
So whats that going to do.???

As a builder. I looked at your posted web, and I never had an instance laying out a foundation for a structure where 3,4,5, or 6,8,10, never worked. Even if its a very small area since an increment of 10 can be applied to each group of the three numbers.

The issue I had with the posted site was that site didn't even mention the 6,8,10, availability which mathematically covers another ljob situation.

BUT, you still have to cross measure to check that square. Hows that work with this calculator to check the Side 3 Length (hypotenuse) when again you have to cross measure and obviously you have room or MUST have room to cross measure,

Also this site never mentioned ALL measurement has to be on a level plane or level in slope with one side level and the adjacent sides equally sloped together to be accurate.

So how could this calc actually be any good at this point. Knowing that last distance and not being able to check it by physically measuring that 45 degree.

Then it talks about how good it is for concrete forms. In my world that's when 345 6810 is the easiest in flat work because Nothing is in the way.

I've seen a lot of sites that misleads the laymen but this so far take the cake by not explaining you STILL have to physically cross measure on a level plane. If you can do that then obviously have to know where one corner is and the other side wall is to cross measure, so whats the point of this Site???

Last edited by 21boat; 06-02-2012 at 12:24 AM.

 06-02-2012, 10:13 PM #20 Old School     Join Date: Jan 2009 Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them. Posts: 3,634 Rewards Points: 2,000 Gary, I can't believe someone would ask you such a question. Do they really think you have to have a connecting third line to get the two ends square? Kind of scares me to imagine them working on a project. __________________ "True eloquence consists in saying all that is necessary, and only that which is." François Duc de La Rochefoucauld Willie T
06-09-2012, 10:50 AM   #21
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Quote:
 Originally Posted by GBrackins Now that I think of it, but correct me if I am wrong, but the 3,4,5 method also requires measuring the diagonal does it not? And the 3,4,5 method does not provide a 45 degree angle, it provides one 90 degree angle, one 36.87 degree angle, and one 53.13 degree angle. If one need a 45 degree angle use 10 for the sides and 14.14 for the diagonal.
correct, a^2+b^2=c^2 for any right triangle with c = the long side (i wont say hypotenuse, apparently that causes wars, lol).

using the 3,4,5 example we know the 5 = c (the long side)

3^2 (9) + 4^2 (16) = 5^2 (25)

to make a 45 degree angle 10^2 (100) + 10^2 (100) = 14.14^2 (200)

To get really giggy, its fun to read the roofing forums, those guys hold advanced degrees in trig but dont even know it!

06-09-2012, 02:26 PM   #22
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Quote:
 Originally Posted by jcrack_corn To get really giggy, its fun to read the roofing forums, those guys hold advanced degrees in trig but dont even know it!
People can easily perform calculus and trig, as long as you don't tell them they are doing calculus or trig. Some people consider math to be a four-lettered word.

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 06-09-2012, 03:52 PM #23 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 What was your expected diagonal length?

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