How Much Slope Does Metal Roof Need Over A Deck

Minimum slope for metal roof realistically any more than 1 4 per foot would okay at all but the most windy times.

How much slope does metal roof need over a deck.

The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Metal should never be set up on a completely flat roof since they were not designed to handle pooling water which will lead to premature rusting and deterioration. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.

The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. I will be attaching it to the house and the roof is 12 x20 with the 12 being the direction the water will be flowing. First mark all the purlin locations on the deck joists. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. A roof with a 6 rise for every 12 run has a 6. To provide drainage the panels should slope toward the outside edge of the deck about 1 4 in. Since it s just over a deck if it had at least that much i probably wouldn t comment.

Minimum slope over deck. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

Standing seam metal roofs with mechanical lock systems to ward off leaks can be successfully and attractively installed on roofs with at least a slope of 1 in 12. Roof pitch is used to describe the slope or angle of the roof. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.

Low slope metal roofs require less material which reduces the overall load on the building s structure. Lower than the purlin along the house 12 x 1 4 3. Minimum metal roof slope depends on the roof profile building design climate and site location. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally.