Slope Of Membrane Roof

When the slope is rather steep 3 12 25 and above it is best to mechanically fasten the membrane by adding roofing nails to the horizontal overlaps every 12 in 30 cm before covering them with the next membrane strip note.

Slope of membrane roof.

The vent secured system creates a suction effect that strengthens the entire roof and holds the membrane securely in place. Minimum and maximum roof slope limits vary based on specific roof system and project types. Minimum roof slope roof pitch r905 11 1. Modified bitumen membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope.

And ice reduces a roof s snow load and dries more quickly than a light colored roof. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. When we say flat roof we don t mean perfectly flat which is undesirable since water still needs to be shed to roof drains. The ssr system is a low slope clip mounted standing seam roof that meets the most demanding performance specifications.

Install the membrane horizontally starting at the bottom of the slope. Resilient synthetic rubber membrane widely used on low slope roofing projects for over 50 years in the united states and worldwide. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. Roof slope equivalents as rise.

Technically we are talking about low slope roofs that have a slope less than or equal to 3 12. Some companies even produce the membrane to look like regular roof shingles. Following is a review of code requirements and nrca s roof slope guidelines as well as some additional factors designers should consider. Pvc is noticeably thick around 40 100 millimeters depending on the manufacturer with a smooth finish.

Minimum slope for a membrane roof. All nails must be covered with a membrane. Tpo flat roof membrane is thermoplastic polyolefin which is a single ply roofing either mechanically fastened fully adhered or. Thermoset single ply roofing minimum roof slope roof pitch r905 12 1.

Pvc vinyl membrane roofing costs the most of the three but provide the best energy efficiency because of its uv resistance and white color. Roof pitch multiplier table. The membrane will outlast the shingles and seal around all nail penetrations. Degrees to pitch rise in run table.

Unroll and position the roll. Proper roof slope can be an important consideration when designing high performance roof systems. These durable low maintenance panels are interlocked and mechanically field seamed into place yielding a single membrane that allows for an efficient and affordable roof solution. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Then apply standard asphalt shingles over the membrane.