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Roof pitch on a lean-to

Sawblade's picture

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

(post #81443, reply #1 of 5)

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.


 

Riversong HouseWright

Design *  * Build *  * Renovate *  * Consult
Solar & Super-Insulated Healthy Homes
 
Riversong HouseWright
Design *  * Build *  * Renovate *  * Consult
Solar & Super-Insulated Healthy Homes

(post #81443, reply #2 of 5)

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.

(post #81443, reply #3 of 5)

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 *  * Consult
Solar & Super-Insulated Healthy Homes
 
Riversong HouseWright
Design *  * Build *  * Renovate *  * Consult
Solar & Super-Insulated Healthy Homes

(post #81443, reply #4 of 5)

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

(post #81443, reply #5 of 5)

If you used EPDM you can go down to 1/2 in 12 if you wish