Slope Of Membrane Roof

For this type of roof shingles and other traditional coatings are less durable and less aesthetic.

Slope of membrane roof.

Membranes and coatings are designed to create a strong seal to prevent leak when water begins to build. For example some epdm membrane assemblies have maximum roof slope limitations as low as 1 2 12. Formation of ponds on flat roofs is detrimental to the longevity and effectiveness of the roof. The ponds will do nothing but lead to siltation which will create stress on the roof membrane causing the distraction of the roof cover.

Thermoplastic single ply membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope. When we say flat roof we don t mean perfectly flat which is undesirable since water still needs to be shed to roof drains. Epdm is the most common membrane and is a black synthetic rubber roof membrane. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

As a building owner it can be helpful for you to understand the characteristics of the roof membranes on your building. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe. Roof coating and membranes serve a vital purpose for buildings and enclosures with flat roofs. Technically we are talking about low slope roofs that have a slope less than or equal to 3 12.

Modified bitumen roof coverings shall comply with cgsb 37 gp 56m astm d6162 astm d6163 astm d6164. Sprayed polyurethane foam roofing minimum roof slope roof pitch r905 14 1. Modified bitumen membrane roofs shall have a design slope of not less than one fourth unit vertical in 12 units horizontal 2 percent slope for drainage. Minimum slope for a membrane roof.

Some tpo membrane assemblies also have relatively low maximum roof slope limitations. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. These membranes are particularly effective for roofs with a very low slope between 1 8 12 1 and 4 12 33. Epdm roof membrane can be secured in a number of ways.

Pvc membrane assemblies generally have higher maximum roof slope limitations. It is imperative that the right slope for the flat roof be adopted to avoid all these potential problems. The different types of coverings can be overwhelming and confusing so here is a breakdown of the basics for each one. When it comes to low slope roof membranes there are differences you should be aware of.