How Much Slope Does Metal Roof Need Over A Deck

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

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. Low slope metal roofs require less material which reduces the overall load on the building s structure. Hey i am going to put a metal roof over my deck in my back yard today and i wasnt sure on how low i can get by with. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following.

To provide drainage the panels should slope toward the outside edge of the deck about 1 4 in. 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. Minimum slope over deck.

Since it s just over a deck if it had at least that much i probably wouldn t comment. 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. Lower than the purlin along the house 12 x 1 4 3. 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.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. 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. 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 roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.

Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material. Roof pitch is used to describe the slope or angle of the roof. A roof with a 6 rise for every 12 run has a 6. I ve built many of those patio covers over the years it rains a lot in oregon and they ve been fine.

Minimum metal roof slope depends on the roof profile building design climate and site location. First mark all the purlin locations on the deck joists. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.