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PATHChat
| SUBJECT: |
RE: RE: roofing - membrane or asphalt+gravel?
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| FROM: |
DEAN YOUNGKEIT
young@brigham.net
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| DATE: |
10/4/2001 11:38:00 PM |
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A membrane is a non leaking sheet of
something:metal, rubber, plastic or
asphalt composite with some sort of
fiber reinforcement to keep it from
cracking when it gets so cold that
asphalt not only shrinks, but becomes
brittle and inviting cracks. A metal
membrane is good for cold weather, but
not for flat roofs because the metal
joints must have an overlapped and
sloping joint.
Rubber sheeting is good because it can
have sealed joints and it will not
become brittle except in the Antarctic.
The use of gravel is to keep the
membrane from lifting and blowing away
in a hard wind. The gravel should have
complete membrane coverage, and be
bonded to it so that the wind creates
no bare spots over the years of wear. A
white rubber glue and white gravel
keeps summer heat reflected. This is
roofing 101 in a nutshell.
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Partnership for Advancing
Technology in Housing (PATH)
451 7th Street, SW, Rm. 8134
Washington, DC 20410-0001
Telephone: 202 708-4277 Fax: 202 708-4250
E-mail: pathnet@pathnet.org |
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