What is 2 ply roofing system?
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The 2 ply system consists of a fiber base sheet with a self adhering modified base attached to it, which is considered the first layer. The second layer is the Modified Bitumen Torch Down membrane which includes embedded ceramic granules for protection against harmful ultraviolet light.
What are the layers of a built up roof?
Built-up roofing systems are most commonly applied with three or four layers of roofing materials to make up the complete roofing system. These layers are typically a base sheet, a fiber sheet, and then either one or two layers of bitumen.
How do you build a built up roof?
First, contractors attach base sheets to the roof’s subsystem using roofing nails. Then, they use tar, concrete, adhesive, or asphalt to glue down felt over the top of the base sheeting. Next, roofers install a layer of gravel or cap sheets, which they then cover with a final layer of asphalt.
How thick is built up roofing?
about 2 to 4 inches
On average, Built Up Roofs are generally anywhere from about 2 to 4 inches, but they can be thicker depending on the amount of asphalt that is applied in each layer during installation.
What is a 3 ply roofing system?
A 3-Ply Hybrid BUR differs from other membrane options due to its combination of a 1ply base sheet with two plies of glass felt that enhances the performance of the membrane with a quicker installation time and less weight on the roofing system itself.
What is a 3 ply built-up roof?
How much does built-up roofing weight?
The weight of a built-up roofing system can range from about 2.5 pounds per square foot for a smooth surface to 6.5 pounds per square foot for a gravel surface. Though not nearly as heavy as a slate roof or a clay tile roof, built-up roofing is generally heavier than asphalt shingles, TPO, PVC, and metal roofs.
How long does built-up roofing last?
If properly installed and maintained, a commercial built-up roof can last 40 years. There are a few other benefits of built-up roofing systems: Seamless and Waterproof – The continuous solid surface does not require joints or seams, removing the most vulnerable area for leaking.
Which is better EPDM or TPO?
TPO has better dimensional stability than EPDM. EPDM is more likely to shrink which can cause a variety of problems on your roof.
What color is EPDM roofing?
black
While TPO has a natural white color, EPDM results in a dark gray or black color for your roof. The darker color is not helpful in reflecting UV rays; it does retain heat for those in cooler weather.
What is a built-up flat roof?
A built-up roof, most of the time referred to as BUR, is a time-tested roofing system typically comprised of hot tar and gravel. It is made up of many layers and typically the top layer is where the tar and gravel lie. This is a system that has been around and in demand for ages.
What should I look for when buying a 2 ply flat roof?
Following is a list of items that should be on your radar and someone well versed in 2 ply modified bitumen flat roofing installations should be able to answer all your questions: The slope of your flat roof determines how well your roof sheds water.
What is built-up roofing?
As a system, built-up roofing (BUR) is a type of asphalt roofing that has been around for more than 100 years. It is one of the most common materials used on low-slope or flat roofs.
What kind of asphalt do you use for a built-up roof?
1. 4 For hot applied built-up roofing system applications, JM-approved asphalt is required. Asphalts are thoroughly evaluated before they are approved for use in any JM built-up roofing system. JM acknowledges that some specifiers choose to use coal tar pitch in built-up roofing systems.
How can I improve the performance of my flat roof replacement?
In order to improve the performance and longevity of your flat roof replacement, several factors should be discussed with your professional roofing contractor to ensure an installation that will carry you through to the end of its expectation.