Timeline for How to taper a flat roof for a slight fall
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 21, 2017 at 10:12 | vote | accept | hazymat | ||
| Apr 2, 2017 at 14:18 | comment | added | Harper - Reinstate Monica | Yes I mean bending the deck material at the diagonal. Flashing depends on your roof system. I was looking at worst case, i.e. Water is in the valley and must have a 2% grade in some direction. And the valley does have to be that. But you're right, the planes on either side can be shallower than I show, it just gets more complicated if you do that. You can hide the grade change with a parapet, which will also keep water drom spilling off the sides of the roof. | |
| Apr 2, 2017 at 11:37 | comment | added | hazymat | And a follow-up question about the theory. Your final diagram has arrows perpendicular to the diagonal. Shouldn't the arrows be at 45 degrees to the diagonal (i.e. the bottom left lot should all be facing upwards and top right lot facing left)? The path of water along the joists and across the joists is steeper than diagonal to the joists. (Hope that makes sense) | |
| Apr 2, 2017 at 11:36 | comment | added | hazymat | Excellent answer, thank you. Indeed we aren't dealing with a 45 degree diagonal so I'll apply Pythagorean Theory. Re the practical aspects of installing I have some follow-up questions. (1) Your last paragraph about bending the ply around bends. Do you mean along the diagonal where 2 planes meet? (2) I guess this diagonal will need flashing under the roof covering (i.e. fibreglass?) (3) Is there a clever way to avoid seeing a roof from tapered from side to side from the rear? | |
| Apr 1, 2017 at 17:52 | history | answered | Harper - Reinstate Monica | CC BY-SA 3.0 |