Does anyone know a formula or an easier way to figure out the angles on a barn loft truss?
Question:I am building a shed with a barn roof on it so I can have plenty of head room for a second floor loft. I'm just not sure how to figure the angles on the trusses. I know that the size and height of the shed make a difference. Anyone have any experience?
Answers:
I have built a green house that basically is a barn roof. I used 4 pieces of 2x4s 6 feet long [long point to long point] Cut on a 22 1/2 on each end of each board, with long points on same side, put those together to make a truss. It gave me a "barn roof" 8 ft high and 16 ft wide [outside measurements] I set this on a knee wall to raise it 3 feet to make my over all height 11 ft. That sounds similar to what you are doing. Rather than doing a drawing I took my miter saw and cut pieces to 1 inch equal one foot and played with that until I liked the size and then built it.
if you have the size and height you can get the angle by using tangent. take a calculator and find the tan-1 button (you usually have to push the 2nd button to get to it) then enter it so it looks like this: tan-1(size/height)
that should find you the angle. good luck ;)
Well its a good Idea, to leave approx 2.8 metres per floor. then you would have to factor, in insulation, finishes etc.
If I were you I would try and do a scale drawing, and measure the angles once you are happy, I do work as a draughstman for a structural engineering firm so I always draw scale drawings to work problems out, maybe its not as easy as i think.
Good Luck
I have just the answer for this question- I get my hubby to do a honey dew.
Look in your local building supply for a rafter square. It will figure the angle for you. I always fiddle with one until I have what I like and make a pattern. The angle on the rafter is the same on both sides {reverserd} the braces are the same {reversed} and the joist is the same lenght. I always divide into three parts leaving the middle open for storage.
The "sides" of the gambrel roof are usually pitched at about 24/12, and the "tops" are normally around 4/12.
More Related Questions & Answers...