Metal Deck Roof Assembly

For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs.

Metal deck roof assembly.

The roof deck most underlayment most roof coverings membranes and air films cannot be considered insulation. Or mineral fiber or glass fiber insulation boards laid over gypsum sheathing and covered by a class a b. Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department. 10 pancake head tek screw.

Metal panel roof systems require a minimum 3 8 air gap between the underside of the metal panel and the covered or uncovered insulation board. Any thickness polyisocyanurate foamed plastic. While a class 1 assembly can be substituted for a class a b or c roof assembly a class a b or c assembly cannot be substituted for a class 1 roof assembly. Building and energy codes almost always specify a required minimum r value for exterior walls and roof assemblies with above deck insulation so the minimum required r value in your local jurisdiction is something that you need to.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Any ul classified type g1 g2 or g3 base ply sheet type 15 20 or 30 felt or ul classified prepared roofing accessory or gcp applied. The panel clips are to be attached to the corrugated metal substratum with one no. Some materials in the roof assembly may require venting of the steel roof deck such as roof systems with light weight insulating concrete.

Venting does not impact the structural performance of the steel deck. G p gypsum densdeck united states gypsum co securock glass mat roof board type sgmrx national gypsum dexcell glass mat roof board or dexcell fv glass mat roof board. Deck should not be specified as vented when it is not required. Trusses supporting metal roof deck panels covered by 1 2 12 7 mm regular gypsum sheathing either loose laid or adhesively or mechanically attached to roof deck.