Single ply roofing

Question 1

single ply roofing: pros

Answer 1

only semi-skilled labor reqd,

more resistant to slight building movement and weather.

(w or w/o reinforcing)

Question 2

single ply roofing:

reinforcing

Answer 2

polyester fibers,
sometimes glass fibers.

more dimensional stability and tear strength.
= better puncture + wind load resistance,
and lies flatter for easier seaming.

Question 3

single ply roofing:

reinforcing typ @

Answer 3

high foot traffic,
high winds,
fully adhered or mechanically attached,

Question 4

single ply roofing:

non reinforcing pros

Answer 4

more elongation, good for substrate movement.

less expensive.

Question 5

single ply roofing:

non reinforcing use

Answer 5

loose-laid, ballasted roof systems,

larger sheets.

Question 6

single ply roofing types:

modified bitumens

Answer 6

bitumen,
chemical additive (add elasticity),
reinforcing fabric (tensile strength),
over insulation,
over separator sheet.
(gravel cover)

Question 7

separator sheet:

Answer 7

between deck/membrane.
allow roof/structure move independently.
some allow water vapor from bldg to escape.

Question 8

single ply roofing types:
permanently harden when heated/cured.
*permanently lose shape if heated again.

Answer 8

thermoset plastics

ex. EPDM, CSPE.

Question 9

thermoset plastics:

recycling

Answer 9

can only be recycled chopped up and mixed w other material,

ex rubber flooring.

Question 10

single ply roofing types:
repeatedly softened w heat, harden when cooled.
ex. PVC, TPO, and hybrid blends.

Answer 10

thermoplastics

Question 11

primary difference thermoplastics and thermoset plastics:

Answer 11

thermoplastics can reheat,
(and are available in white)
(and can be recycled)

thermoset plastics heat once, deform after that.

Question 12

most common single ply

Answer 12

EPDM

Question 13

chlorosulfonated polyethylene:

trade name

Answer 13

Hypalon

Question 14

thermoplastic:
easy to install,
white,
relatively inexpensive.
seams are heat welded.

Answer 14

PVC

Question 15

always fully adhered

Answer 15

Hypalon

chlorosulfonated polyethylene (CSPE)

Question 16

blend of polypropylene and ethylene propylene.

cost low, compared to EPDM.

Answer 16

thermoplastic polyolefin (TPO)

Question 17

butyl, Neoprene, Hypalon.
1 or 2 brush/spray coats,
air-cured,
forming elastic, waterproof surface.
also used below grade.
good for complex shapes.

Answer 17

elastic liquid roofing