How Much Of Drop Should Patio Roof With Plastic

Install vent as close to roof peak as possible.

How much of drop should patio roof with plastic.

To provide drainage the panels should slope toward the outside edge of the deck about 1 4 in. Anything with a slope of some kind will cause water to run off the roof. 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. However an ideal roof drop per foot should be at least one eighth to one quarter of an inch per foot.

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. The slope should be at least 1 inch for each 8 feet of patio. Plastic patio pergola awning covers polygal roof panels clear patio covers for pergolas multiwall polycarbonate sheets often referred to by the brand name of polygal are a structured sheet product available in double and triple layered configurations and manufactured in various colors and degrees of transparency.

If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 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. Nail trim limber to all corners and to front and back where panels meet roof. Plan to space the 2x4 purlins parallel to the house and 3 ft.

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. Measure the calculated amount of slope down from the string tied to the stake at the drainage end of. A 16 foot patio will need 2 inches of slope. Apply front and back panels similarly to side walls.

Anything less than one eighth of an inch may pool on the roof. Lower than the purlin along the house 12 x 1 4 3. Determine the amount of slope needed for the size of the paver patio. Some building codes start at one quarter of an inch per foot or two percent.

Some additional considerations for this project. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.