2x6 On Flat In Attic

I ve never seen so much black mould and condensation and moisture in a new flat roof.

2x6 on flat in attic. Click the button to calculate the stock size needed for this job. Many shingle manufacturers recommend no less than 2 12 when installing. 1 psf lb f ft 2 47 88 n m 2. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.

Live load is weight of furniture wind snow and more. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The reason for this is that flat or shallow roofs withstand much more abuse and loads than steeper roofs making wider shed roof rafters a necessity. 2 are indicated below.

Input the rafter span on the flat eave overhang and pitch of the roof. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Dead load weight of structure and fixed loads 15 lbs ft 2. 1 ft 0 3048 m.

Many roof material manufacturers have minimum pitch ratings for their products. The recently completed 16 by 24 foot building has 2 4 walls and a roof with a 2 10 ridge and 2 6 rafters. This would create a flat surface to adhere and nail on the double tall 2x6 joist. Nonparallel ceiling joist designs require additional support construction in the ceiling.

It would also add some stregth too if you. Area span on the flat please enter area span on the flat in foot. This calculator is to be used as an estimating tool only.