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The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Pitch for under deck roof. 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. Among the newest is the raintight system introduced at deck expo 2014. Many porches use 22 diameter corner and intermediate footings.
Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater. The footings for porch decks must be larger than deck footings. 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. If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in.
The slope or pitch of the under panels can be at any degree that will shed the water. 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. If you consider it as similar to a roof than according to code. So let s say a roof rises 6 inches for every 12 inches in depth towards the peak.
First mark all the purlin locations on the deck joists. 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. Adding a roof to your deck is best done as the deck is being built. Liquid applied roofing requires a minimum roof pitch of 1 4 12 or greater.
Install the purlin along the house and the outer purlin. Sprayed polyurethane foam roofing requires a minimum roof pitch of 1 4 12 or greater. The most common styles are gable hip and shed. 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. Lower than the purlin along the house 12 x 1 4 3. However you can only use this pitch with built up roofing or specialized synthetic roofing. 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.
Then stretch a string between them. Typical decks are designed to support 55 psf lbs per square foot. Convert the space under a second story deck into a dry spacious patio by installing this simple under deck ceiling and gutter system. Consider including an ice and water barrier too.
The roof pitch would be described as a 6 12 pitch.
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