Siporex Roof Panels - Structural engineering general discussion
Siporex Roof Panels. woodman1967 (Structural) (OP) 13 Nov 09 14:09. I am working on a project where there will be Air intake hood will be installed on the flat roof of an existing building. Everything was set and ready for installation when it was discovered the roof was built using 4" siporex roofing panels. The building is 40 years old.