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Length of rafters

specialized105 · 2014-10-29 14:48:01

Garage built to wall plate and wanna know what length timbers i need to order for a 35 degree pitched roof angle to ridge board? , measures to outside of blocks is 6metres square will 5x2 14 foot lengths do the job and leave me enough overhang for facia?

29-10-2014 2:48pm

#1

specialized105

Registered Users, Registered Users 2 Posts: 143 ✭✭

Join Date: September 2013

Posts: 105

Garage built to wall plate and wanna know what length timbers i need to order for a 35 degree pitched roof angle to ridge board? , measures to outside of blocks is 6metres square will 5x2 14 foot lengths do the job and leave me enough overhang for facia?

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Comments

#2 29-10-2014 4:22pm

Jimmy_M

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Join Date: July 2014

Posts: 190

According to my secondary school maths and pithagros' theorom - you need the following equation.
cos(35) = 3m/Hyp
.819 = 3/hyp
hyp = 3/.819
hyp = 3.66m

3.66 metres is 12 feet so 14 ft should be enough.

PS: I wasnt quite sure what you meant by "measures to outside of blocks is 6metres" but i assumed it to be the span of the entire roof - and the 3 above comes from half of that 6.

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