Suzanne

To answer the questions: Code does not allow gas pipes to be installed under the house slab. The pipe used was galvanized and the AC and heating units are not in the attic but the ductwork is, and no combustible or mechanical devices are in the attic. However, there are lots of recessed cans for lights that could possibly create a spark that could possibly ignite the gas if there were to be a leak in one of the pipe fittings. The reason for the sealed attic (with Icynene) was to keep the humidity and heat out of the attic, since this is a super hot and humid place near the beach, ie the attic would become part of the conditioned space so I'd have a cooler, more energy efficient house. I am not a designer, and none of the officials of any type, all over the country, have been able to provide an answer. I appreciate all the communication, I'm trying to make informed decisions and this is helping me determine the best insulation plan.

I just completed the exterior (and framing) of an ICF house in Florida, and it has a barrel tile roof. Plan was to use open cell Icynene insulation in cathedral type attic. However, the gas pipe installer installed galvanized gas pipes in the attic for the gas appliances. Now I'm worried about the lack of venting should there be a gas leak. The house was built for a sealed attic. How can I solve the problem of venting for a potential gas leak and still use Icynene? Should I change the plan to use a radiant barrier on styrofoam board, seal the perimeters, and use cellulose on the ceiling floor, or what? Perhaps a forced air system through the attic?