How Many Plys To Use On Built Up Roof

Built up roofing lifespan depending on the climate and the specific materials used built up roofing has an average life expectancy of 15 to 30 years but some constructions can last up to 40 years.

How many plys to use on built up roof. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. Carson dunlop s sketch illustrates a 4 ply built up roof installation. In general built up roofing tends to fare better in warmer climates than in cold regions. Apply 3 plys with hot mopping between each ply.

Exceptionally pliable easy to handle and lays flat. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. Built up roof cost estimates may require an onsite inspection. Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.

For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. Makes it suitable as an intermediate or ply felt in cold applied built up and modified bitumen roof assemblies. Versatile gafglas ply 4 sheet for built up roofing bur offers maximum strength and stability and can be used in all climate zones as a base sheet ply felt and more. Permaply 28 is designed for use as the first or base sheet in built up roofing or modified bitumen roof assemblies.

The number of plies in a cross section is the number of plies on a roof. Usually these estimates will be free. We have found an occasional bur on steeper slopes including a tar and gravel steep slope roof whose gravel kept washing down into the building s gutter. Labor tasks clear roof surface of debris.

Sometimes a base sheet used as the bottommost ply is mechanically fastened. The average built up roof will have between three and five plies not including the waterproofing membrane layers. Paint exposed flashing cement with uv resistant coating. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.

Finally the entire surface is coated with a protective top coat such as gravel or clear glaze. The term four plies denotes a four ply roof membrane construction. Glue secure and prime flashing. This price range can change depending on the materials you choose.