Grambrel Roof Question - Dimensions - Carpentry - DIY Chatroom Home Improvement Forum

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08-08-2011, 02:13 AM   #1
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## Grambrel Roof Question - dimensions

I have what should be an easy question but am having trouble finding information, or when I do find an answer, it is not the same as I worked out.

I am building a grambrel shed, 10 feet wide. I am going with 22.5 degree angles and my calculations (based on 10 feet wide and five foot high starting points) are 45 and 3/4 inches (long side)for each of 4 pieces that will be cut at 22.5 degrees. I will be using wood gussets (9 x 16").

The figures I ge on the internet for 10 foot wide and 22.5 degrees are either 45 inches or 43 and 15/16 inches. I saw something that said multiply your length by .366 (that gives 43.92 inches).

I have layed my template out on the basement floor and now the deck of my new shed, and each time still get 45 and 3/4 inches.

Anyone know why the answer is so hard to find? I mean the problem is basically where does the mid point of a 1/4 of a circle that is a 5 foot arc lie. Each time I get the same thing.

08-08-2011, 09:59 AM   #2
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Using pencil and paper I get 45.9" which pretty much confirms your 45.75". There is a lot of bum dope on the internet as well as a wealth of good information. Cut 45 and 3/4" slightly large.

 08-08-2011, 11:09 AM #3 Member   Join Date: Jun 2011 Location: Atlantic Canada Posts: 379 Rewards Points: 252 I am also getting 45.9" on the exterior of the truss (aka long side)

 08-08-2011, 08:19 PM #4 Newbie   Join Date: Aug 2011 Posts: 2 Rewards Points: 10 thx shazzaple and zircon I'll go with 45 and, as they say, a big 3/4" ....lol much appreciated.

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