Single ply roofing Flashcards
single ply roofing: pros
only semi-skilled labor reqd,
more resistant to slight building movement and weather.
(w or w/o reinforcing)
single ply roofing:
reinforcing
polyester fibers,
sometimes glass fibers.
more dimensional stability and tear strength.
= better puncture + wind load resistance,
and lies flatter for easier seaming.
single ply roofing:
reinforcing typ @
high foot traffic,
high winds,
fully adhered or mechanically attached,
single ply roofing:
non reinforcing pros
more elongation, good for substrate movement.
less expensive.
single ply roofing:
non reinforcing use
loose-laid, ballasted roof systems,
larger sheets.
single ply roofing types:
modified bitumens
bitumen, chemical additive (add elasticity), reinforcing fabric (tensile strength), over insulation, over separator sheet. (gravel cover)
separator sheet:
between deck/membrane.
allow roof/structure move independently.
some allow water vapor from bldg to escape.
single ply roofing types:
permanently harden when heated/cured.
*permanently lose shape if heated again.
thermoset plastics
ex. EPDM, CSPE.
thermoset plastics:
recycling
can only be recycled chopped up and mixed w other material,
ex rubber flooring.
single ply roofing types:
repeatedly softened w heat, harden when cooled.
ex. PVC, TPO, and hybrid blends.
thermoplastics
primary difference thermoplastics and thermoset plastics:
thermoplastics can reheat,
(and are available in white)
(and can be recycled)
thermoset plastics heat once, deform after that.
most common single ply
EPDM
chlorosulfonated polyethylene:
trade name
Hypalon
thermoplastic: easy to install, white, relatively inexpensive. seams are heat welded.
PVC
always fully adhered
Hypalon
chlorosulfonated polyethylene (CSPE)
blend of polypropylene and ethylene propylene.
cost low, compared to EPDM.
thermoplastic polyolefin (TPO)
butyl, Neoprene, Hypalon. 1 or 2 brush/spray coats, air-cured, forming elastic, waterproof surface. also used below grade. good for complex shapes.
elastic liquid roofing
