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Modified
Bitumen (MB) is asphalt that has had modifiers added
to it to give it plastic or rubber-like properties.
The most common types of modifiers being used are APP
(Atactic Polypropylene) and SBS (Styrene Butadiene Styrene).
Rolls of modified bitumen membrane come in widths of
36" (0.9 m) to approximately 39" (1 m) and cover an
area of approximately 100 square feet to 112 square
feet. Surfacings for these roll materials consist of
mineral granules, aluminum, copper, or an aggregate
such as gravel or slag. Modified Bitumen roof systems
consist of one, two, or three ply systems. The type
of substrate will often determine the type of system
being installed. Modified membranes can also be installed
in conjunction with built-up roof materials (such as
multiple plies of fiberglass felt) to form a hybrid
roof system. Modifieds have proven performance on residential,
commercial, and industrial applications. Roofhelp recommends
that all modified roofs be installed on slopes not less
than 1/4" per horizontal foot in order to achieve positive
drainage.
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Modified
membranes can also be installed in conjunction with built-up
roof materials (such as multiple plies of fiberglass felt)
to form a hybrid roof system. Modifieds have proven performance
on residential, commercial, and industrial applications.
Roofhelp recommends that all modified roofs be installed
on slopes not less than 1/4" per horizontal foot in order
to achieve positive drainage. |
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system was developed in Europe during the sixties and
introduced in the U.S. in the early seventies. The term
modified refers to the addition of plastic or rubber-based
polymeric binders to asphalt to improve its performance
and weatherability. Modified bitumen is used in multiple
layers in what is essentially a “factory assembled”
built-up roof. Several coats or laminations of modified
bitumen are reinforced with a woven glass or polyester
fabric reinforcing mat, which is often covering with a
granule-surface cap sheet, or left smooth for aluminum
or white coating to be applied. Modified bitumen roofing
exhibits many characteristics of a built-up roof (BUR),
yet affords the ease of application of a single-ply system.
These membranes are resistant to heavy traffic, punctures
and tears. |
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Sparks Roofing
2337 Grandview Street
San Diego, CA 92110
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