Originally Posted by wwsteel7
New user here.
Am doing a re-roof. House already has shingles, and still fairly good shape.
However, I am installing a rainwater catchment system, and a steel(29 guage) roof is required.
What is the proper way to install the new metal? Remove the shingles first or leave them?
Either way, must I install 2x2 furring or something like that underneath the metal?
Man, that is a light metal.
If you put that on top of any deflections at all, they will telegraph right through the panels.
Are you committed to that 29 GA panel?
I would recommend a 24 GA, but even using a 26 GA would be a significant improvement.
Also, the more proper method would be to remove the shingles. Just because you don't "Have To", does not mean it is the Right Thing To Do.
I compete against many competitors who proudly proclaim that they roof to the minimum code standards.
Well, good for them.
For those that passed the test, congratulations.
Your grade is a D Minus.