Exam 33: Roofing-I Low-Slope Roofs

What are the limitations of torch application of modified- bitumen sheets as compared with hot- mopping?

Insulating concrete and foamed concrete can be used as insulation on a steel roof deck. Both these concretes must also include board insulation. Which board insulation is used and why is board insulation necessary when the concrete has insulating value?

What is the size of a typical built- up roof felt, and what is its relationship with a roof square?

A single- ply roof membrane is made of polymers (plastics), which are available in two types. Give the names of the polymers and the differences between them.

Using a sketch, explain the essential components of a low- slope roof.

Name various types of flashings required on a low- slope roof.

With a steel deck topped with lightweight insulating concrete, the commonly used board insulation is

List various life- safety issues that must be considered in the design of low- slope roofs.

Discuss the differences between SBS- modified and APP- modified bitumen roof membranes.

Because of the general trend toward sustainable and organic construction, organic felts are increasingly replacing fiberglass felts in built- up roofs.

A roof square implies

The asphalt used in modified bitumen sheets is modified asphalt, which is of two types: SBS modified and APP modified asphalt. What are the differences between the two?

List the three types of roof membranes used on low- slope roofs.

A loose- laid ballasted roof is generally used with

A dragon wagon is used in laying

The insulation in a low- slope roof may consist of board insulation or non- board insulation. Which non- board insulation is most commonly used in low- slope roofs and why? What are its limitations?

Which types of roof membrane can be used above the insulating or foamed concrete roof insulation?

Which of the following modified bitumen membranes is generally torch applied?

FM 1- 120 represents

Low- slope roofs are more commonly used than steep roofs.