Pitched Roof Under Deck

Summer calls for sultry nights under the stars and sun drenched cocktail gatherings making the backyard deck the ultimate destination this season.

Pitched roof under deck.

A deck on a sloped roof requires a different approach to the framing underneath the joists. The project illustrated here was a complete teardown and rebuild so i framed the roof with 2x8s spaced on 16 in. Roof deck framing unlike for decks at ground level doesn t entail a ledger attached to the rim joist of a house. If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.

Whenever i install decking over a roof i make sure the framing is structurally sound and properly pitched to drain water. Once you have your beams in place everything above them joists deck boards balusters and handrails is the same as for any other deck. Typical decks are designed to support 55 psf lbs per square foot. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.

First mark all the purlin locations on the deck joists. For those who desire a bit more shade and privacy while soaking up the rays however a deck roof may be in order. Centers supported by a beam and a ledger as on most decks. Installing a porch roof over an existing deck is usually not recommended unless the deck was originally designed to support a future porch.

Then stretch a string between them. Porch decks require 25 additional psf for roof loads for a total of 80 psf. Lower than the purlin along the house 12 x 1 4 3.