Roof Deck Framing Details

Rafters should be attached to the header beam using hurricane ties.

Roof deck framing details.

Building a deck over a flat roof is very similar to building a deck over a concrete patio. You will need to attach the porch rafters to the house roof rafters and replace the roofing and flashing. Fiber roof underlayment as a final substrate. Cdx plywood glued and screwed to the framing.

Our new smooth series cellular deck offers a blemish free beam to pan rivet. Kiln dried softwood is recommended for purlins or decking pine fir hemlock and spruce. First you must make sure the roof is strong enough to support 55 lbs per square foot. If you are tying the shed roof into an existing roof on the house you will need to remove the shingles and sheathing to expose the roof framing.

These decks are often referred to as floating as they are not secured in place as a stand alone structure. They are merely placed on top of another structure. The roof sheathing is 3 4 in. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

The roof deck should be properly flashed with a. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters. Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. When using purlins fabral recommends a maximum spacing of 24 on center note that 5v requires solid decking.

Add the length of the overhang beyond this mark and. The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members. To create a smooth surface and to protect the bottom of the rubber roofing from any fasteners or rough edges on the plywood i installed 1 2 in. Download free high quality cad drawings blocks and details of roof and deck insulation organized by masterformat.

Details for conventional wood frame construction. Pullout values decrease if the fasteners protrude completely through the purlins. The roof deck surface should sloped away from the house a minimum 1 8 inch per foot so the water will drain and not pond the finished walking surface of the roof deck surface should be below the level of the interior floor by at least 1 1 2.