When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.
How many plys to use on built up roof.
Next the installers will alternate layers of roof felt or fiberglass with mopped on asphalt or coal tar.
Carson dunlop s sketch illustrates a 4 ply built up roof installation.
The average built up roof will have between three and five plies not including the waterproofing membrane layers.
Built up roofing for an average commercial roof it will usually cost between per 5 50 8 50 square foot in materials and labor to install a typical built up roofing system.
Sometimes a base sheet used as the bottommost ply is mechanically fastened.
The number of plies in a cross section is the number of plies on a roof.
Exceptionally pliable easy to handle and lays flat.
Click to enlarge any image built up roofing is usually used on flat or low slope roofs less than 3 rise in 12 of run.
The term four plies denotes a four ply roof membrane construction.
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.
Makes it suitable as an intermediate or ply felt in cold applied built up and modified bitumen roof assemblies.
In general built up roofing tends to fare better in warmer climates than in cold regions.
This price range can change depending on the materials you choose.
Permaply 28 is designed for use as the first or base sheet in built up roofing or modified bitumen roof assemblies.
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.
Apply 3 plys with hot mopping between each ply.
Glue secure and prime flashing.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
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.
Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.
Finally the entire surface is coated with a protective top coat such as gravel or clear glaze.
Labor tasks clear roof surface of debris.
Built up roof cost estimates may require an onsite inspection.
Paint exposed flashing cement with uv resistant coating.
