Question About Insulation Under Torch-down Roof

jack

does anyone know if its necessary to install insulatIon under torch down if the roof goes over standard joist construction with R-13 fiber glass insulation
IS THIS A MANUFACTURES REQUIRMENT? Thank you.

Grumpy

Depends ont he manufacturer. We have installed Firestone APP on the roof deck many times. We use a double layer of base sheet always. It's my experience insulation is NOT a requirement in some applications but most manufacturers have their requirements on their websites. I know in some cases it is a requirements so let me rephase my answer:

It depends on the manufacturer and the application.

jmorgan

Our where I live, no one can get insurance to allow torch down anymore. You might check with you building dept. for ceiling insulation requirements. Out in my area it is R-38.
Jim

Grumpy

Not sure on the R value of typical roof insulations. We usually use 1 1/2" ISO board.

Unregistered

I have been reading about the torch-down roofs as a replacement. What roof is going to be the best replacment for a tar and gravel roof at a dry cleaners- lots of equipment up on the roof, last the longest, not leak, be cost-effective and cut down on the heat in the cleaners? Pro-teck also looked interesting. Thanks! Susan

Grumpy

Susan one word... SPF. I am not capable of installing it but it's about the best material when dealing with alot of penetrations. It also has insulation properties and lasts a very long time.