CEMP-ET
TI 809-53
01 May 1999
Table 2-5.
Principal Design Considerations--Low-Slope Roofing
Initial
LCC
Constuc-
Insp. &
Life
Low-Slope
Cost
Cost
tion
Repair
Years
Roofing
Difficulty
Difficulty
Systems
BUR
Smooth
L
M
L
L
15
Cap Sheet
L
M
L
L
15
Aggregate
M
L
L
M
20
L
M
L
M
15
MB
Single-Ply
Mechanically
M
M
M
L
15
Adhered
M
M
M
L
15
Ballasted
L
L
L
M
15
H
L
L
H
20+
PMR/Ballast
H
M
M
M
20
SSSMR
L
M
L
L
20 (a)
SPF
Low-Slope
Suitable
SuitableF
Wind
Ponding
Traffic
Resist
Roofing
For Cold
or Hot
Resist
Chem.
Hail
Systems
BUR
Smooth
M
L
L
L
L
L
Capsheet
L
H
L
L
L
L
Aggregate
H
H
H
H
M
L (b)
M
M
M
M
M
L
MB
Single-Ply
Mechanically
M
H
M
M
L
M
Adhered
M
H
M
M
L
M
Ballasted
M
M
H
M
L
M
H
H
H
L
H
L
PMR/Ballast
M
H
M
L
L
(c)
SSSMR
M
H
M
M
L
(d)
SPF
L = Low, M = Medium, H = High
(a) Requires periodic recoating.
(b) Coal Tar resists petrochemicals.
(c) Zinc/aluminum vulnerable to acids, alkali, salts.
Sealants vulnerable to solvents, oils.
(d) Depends upon coating selected.
2-6
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