Chat with AIExam 33: Roofing-I Low-Slope Roofs
A single- ply roof (SPR)membrane is made of polymers (plastics), available in thermosetting type or thermoplastic type. Give examples of commonly used SPR membranes in both types of plastics.
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VerifiedThermosetting type: EPDM SPR membrane.
Thermoplastic type: PVC and TPO SPR membrane.
With the help of a sketch, describe a protected membrane roof.
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Answered by Examlex AI CopilotA protected membrane roof (PMR) is a type of roofing system where the waterproofing membrane is installed on top of the insulation, rather than directly on the roof deck. This design helps to protect the membrane from damage and weathering, extending its lifespan.
In a PMR system, the insulation is typically placed on top of the roof deck, and then a layer of protection board is installed over the insulation. The waterproofing membrane is then placed on top of the protection board, creating a barrier against water and other environmental elements. This membrane can be made of various materials, such as rubber, PVC, or modified bitumen.
To further protect the membrane, a layer of ballast or pavers is often added on top of it. This not only provides additional protection from UV rays and physical damage, but also helps to weigh down the membrane and prevent it from being lifted by wind uplift.
I have attached a sketch to illustrate the components of a protected membrane roof. (Sketch shows roof deck, insulation, protection board, waterproofing membrane, and ballast/pavers layer)
The cover board generally used between a single- ply roof membrane and rigid board insulation is
(35) In a low- slope roof, the cover board has several functions. List the four most important functions.
(30) In how many types is roofing asphalt available? Which asphalt is used for interply mopping, i.e., mopping of felts in a built- up roof (BUR)membrane?
(33) The lap seams in an EPDM roof membrane are typically sealed by
(35) Built- up roof (BUR)felts are available in Type IV and Type VI felts. Why is Type VI felt generally preferred to provide a better BUR membrane?
(36) Name the flashing that is used between the parapet wall and a low- slope roof.
(27) List two important limitations of single- ply roof (SPR)membrane over built- up roof (BUR)and modified- bitumen roof (MBR)membranes.
(37) Describe the attachment method of various components (insulation, cover board and membrane)of a fully mopped single- ply roof (SPR)membrane on a reinforced concrete deck.
(30) Which of the following roofing asphalts is commonly used for interply mopping?
(28) Explain the differences between coal tar and asphalt as roofing bitumen, and state why coal tar is not commonly used.
(29) What are the advantages of torch application of modified- bitumen sheets as compared with hot- mopping?
(39) Explain what a cool roof is, and state its advantages and limitations.
(28) Describe the attachment method of various components (insulation, cover board and membrane)of a mechanically fastened EPDM roof membrane on a steel deck.
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