REQUEST FOR BOARD ACTION

Asphalt Roofing Manufacturers Association, GAF, GAF Technical Advisory Bulletin – Structural Concrete Roof Decks Utilizing Lightweight Aggregate, 1/29/2014. – Will not warrant membranes installed over non-ventilated steel decks. For PVC and TPO, they recommend a vapor retarder over concrete and require a vapor retarder over lightweight ... ................
................