How To Level A Roof Curb
The parameters are 4 w x 63 l with a 1 2 12 slope.
How to level a roof curb. In most cases the roof top unit base rail seats down around the original roof curb naturally making the unit larger than the roof curb itself. First the basic design of the curb should take into account the roofing components so that it can be properly flashed into the roof system. Secure the curb to the roof support members. Install cant strips around the curb.
Remove any twist within the cu rb due to roof supports and square the curb. Bring field supplied roofing felt up to the top of the curb nailing strips. Install 2 inch thick boards or rigid insulation around the curb. I have a curb going around an opening in the roof and everything works.
I want it to be level on both ends. But the top of the curb slopes with the roof slope. Nail felt into place. Instead measure the highest point of the roof curb that is roofed into the building or right below the unit base rail.
The length goes the direction of the slope with a 1 starting distance off the top of the roof. See two downloadable forms on our website welded rtu curbs and calculating the pitch of a roof for a visual representation of this data in principle it s straightforward enough. I ve attached what i ve got. Here at curbco we re happy to create curb for sloped roofs as long as we have the data we need.