Pitch For Under Deck Roof

Convert the space under a second story deck into a dry spacious patio by installing this simple under deck ceiling and gutter system.

Pitch for under deck roof.

Porch decks require 25 additional psf for roof loads for a total of 80 psf. Minimum slope is 1 4 inch vertical in 12 units 2 slope and ideally 1 2 vertical in 12 units 4 slope. This is for metal roofs that have a sealant between their lapped seams. The roof pitch would be described as a 6 12 pitch.

The most common styles are gable hip and shed. Consider including an ice and water barrier too. A number of recently introduced under deck ceiling systems use corrugated aluminum or plastic panels designed to catch water that drains through decking and channel it away from the area below. Typical decks are designed to support 55 psf lbs per square foot.

Step 2 install a wood support structure for your panels screwing a row of 2 by 4s running parallel to your wall every 2 feet along the underside of your deck. That is to say the roof pitch expressed as a ratio tells you how many inches the roof rises for every 12 inches of depth. So let s say a roof rises 6 inches for every 12 inches in depth towards the peak. However you can only use this pitch with built up roofing or specialized synthetic roofing.

If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in. Then stretch a string between them. Sprayed polyurethane foam roofing requires a minimum roof pitch of 1 4 12 or greater. Among the newest is the raintight system introduced at deck expo 2014.

Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. As a result most decks have inadequate footings to support a new porch roof. The primary reason roof pitch exists in the first place is to redirect water. First mark all the purlin locations on the deck joists.

If you consider it as similar to a roof than according to code. Many porches use 22 diameter corner and intermediate footings. Install the purlin along the house and the outer purlin. If you choose to add a roof to an existing deck you may need to add additional supports so it can hold the weight of the roof.

Lower than the purlin along the house 12 x 1 4 3. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Liquid applied roofing requires a minimum roof pitch of 1 4 12 or greater. Adding a roof to your deck is best done as the deck is being built.

The slope or pitch of the under panels can be at any degree that will shed the water.