Roofing Assembly Layers

All materials used in a roof assembly must be both weather and fire safe as well as compatible with each other.

Roofing assembly layers.

And nails for base layer spaced 6 152 mm o c. Decking most often made out of plywood this roof layer is installed over the framing in a typical roof install. A roof assembly includestheroofdeck vaporretarder substrateorthermalbar rier insulation vapor retarder and roof covering. Stagger joints between layers and on base layer of both sides.

Where the existing roof assembly includes an ice barrier membrane that is adhered to the roof deck the existing ice barrier membrane shall be permitted to remain in place and covered with an additional layer of ice barrier membrane in accordance with section r905. A system designed to provide weather protection and resistance to design loads. The roof decking acts as a unifying structure by tying the trusses joists together. You can usually see the underside of plywood decking from the attic.

A roof assembly includes the roof deck vapor retarder substrate or thermal barrier insulation vapor retarder and roof covering. Base layer attached with 1 7 8 48 mm 6d cement coated nails 6 152 mm o c. The roof deck is the roof layer also called sheathing that is installed between the trusses joists and underlayment layer in a typical roof install. Bur is preferred for low slope or flat roofs because it creates a continuous sealed surface.

Here are the layers of a roof in order of application bottom to top. The system consists of aroof covering and roof deck or asingle component serving as both the roof covering and the roof deck. Sound tested with studs 16 406 mm o c. Built up roofing bur systems popular in north america for more than 100 years built up roofing bur systems are composed of alternating layers of bitumen asphalt and fabrics called roofing felts.

Roofing requirements for the design materials construction and quality of roof assemblies for residences are listed in the california residential code chapter 9. The covering applied to the. Framing includes the roof trusses that sit at the top of your house and support the weight of all the materials used to build your roof. The sy stem consists of a roof cover ing and roof deck or a single component serving as both the roof cov ering and the roof deck.

We ll lay out these important pieces of the roofing puzzle and break down each one so you can fully understand the importance of each layer. Face layer attached with 2 3 8 60 mm 6d cement coated nails 8 203 mm o c. It is composed of alternating layers of reinforcing fabric and bitumen asphalt and is finished with a top layer of aggregate such as stone or gravel. It provides structure by tying the trusses and joists together.