I’m building a lean-to on the back of my shop. Shop is an 8/12 pitch but has gutters, so no rainwater from the shop will feed onto the lean-to. I would like to keep the “low” end up as much as possible for head clearance. I will be using metal for the roofing on the lean-to. What do you think is the most shallow pitch I should use. In order to keep the “low” end up, it’s probably going to need to be 2/12. Is this too shallow?
Thanks
Replies
You could get away with a 2:12 roof, but make sure it's built to take the snow load.
And I would suggest sheathing the roof with rough-sawn 1" boards, covering with 15# felt as secondary drainage plane, and using 1" gasketed screws (in the flats of the roofing) so that the points aren't sticking through.
Solar & Super-Insulated Healthy Homes
Not much chance of snow here in S. Carolina.
I know it's "just a lean-to", but I didn't want there to be an issue with drainage and the shallow pitch.
Well, you didn't say where you were located.
But drainage protection is why I suggested solid (rather than skipped) roof sheathing and a secondary drainage plane.
Riversong HouseWright
Design * * Build * * Renovate * * ConsultSolar & Super-Insulated Healthy Homes
What do you think is the most shallow pitch I should use.
Depends on the roof material. Check the install manual for the specific product you're going to use. All metal roofing is not the same.
http://grantlogan.net/
Today we's learnin' about rawks. They's all kinds of rawks. These [picks up rock] is rawks which you throw. These here [throws rock at Rusty] is rawks that you get hit with. E.Cuyler
If you used EPDM you can go down to 1/2 in 12 if you wish