How Much Of Drop Should Patio Roof With Plastic

Measure the calculated amount of slope down from the string tied to the stake at the drainage end of.

How much of drop should patio roof with plastic.

Determine the amount of slope needed for the size of the paver patio. One contractor said 1 1 4 1 1 2 inch we wouldn t notice but i find that really hard to believe and gave me question as to his integrity. 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 should be at least 1 inch for each 8 feet of patio.

Roof pitch in layman s language simply refers to the steepness of the roof. However you can only use this pitch with built up roofing or specialized synthetic roofing. For example a 12 foot patio will need 1 inches of slope. However an ideal roof drop per foot should be at least one eighth to one quarter of an inch per foot.

The pitch of a roof is arrived at by dividing the vertical rise and its horizontal span or what people in the roofing industry would refer to as the slope. Lower than the purlin along the house 12 x 1 4 3. Fasten aluminum ridge roll flashing to each panel as you proceed. Cut to fit pitch of roof and around vent.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Nail trim limber to all corners and to front and back where panels meet roof. To provide drainage the panels should slope toward the outside edge of the deck about 1 4 in. I know the standard is to have 1 4 drop per foot but have you ever been on a patio with a steeper grade and it still get relatively flat.

Some additional considerations for this project. Anything less than one eighth of an inch may pool on the roof. Some building codes start at one quarter of an inch per foot or two percent. Install vent as close to roof peak as possible.

Plan to space the 2x4 purlins parallel to the house and 3 ft. Anything with a slope of some kind will cause water to run off the roof.