CEMP-ET
TI 809-53
01 May 1999
Table 2-3. Preserving the Environment--Low-Slope Roofing
Use
Reuse
Minimize
MaintainableSu
Recyclable at
RecycledM
Production
Health Risk
stainable
End of Life
aterial
Scrap
Dry Felt
Built-Up Roofing
Smooth
Yes
Good
Easy
No (d)
Capsheet
Yes
Good
Fair
No (d)
Aggregate
Yes
Except Tar
Difficult
No (d)
Modified Bitumens
Unsurfaced
No
Good
Easy
No (d)
Capsheet
No
Good
Fair
No (d)
Non-vulcanized
EPDM
Adhered
No
Good
Easy
No (e)
Mechanically Fastened
No
Good
Easy
No (c) (e)
No
Good
Fair
No (c) (e)
Recycle Trim
PVC Plasticized
Mechanically Fastened
Maybe
Good
Easy
Maybe
Fully Adhered
Maybe
Good
Easy
Maybe
Unreinforced
Weldable Unplasticized
Mechanically Fastened
No
Good
Easy
Maybe (c) (e)
Fully Adhered
No
Good
Easy
Maybe
Ballasted
No
Good
Fair
Maybe (c) (f)
No
No
Once set
Easy
No
SPF
Yes
Yes
Yes
Fair
Yes
Hydrostatic Metal
(a)
Ballast could be reusable if cleaned and screened. Currently not done.
(b)
Polystyrene insulation in unadhered applications could be cleaned and reused.
(c)
Lightgard pavers could be reused.
(d)
BUR scrap, asphalt, felt and aggregate could be recycled into curbs or into low grade paving if
economics were more favorable.
(e) EPDM could be reprocessed to extract oil, carbon, if economics were more favorable.
(f) Aggregate could be washed and screened to remove fines.
2-6.
DETAILED INFORMATION. Once a tentative roofing system selection has been made
using information provided by this chapter, refer to Chapters 3 through 10 for supplemental
information and Design Alerts.
2-7.
USING PRINCIPAL DESIGN CONSIDERATIONS TO REDUCE THE NUMBER OF
POSSIBLE ROOF SYSTEMS.
a. Principal Design Considerations. Tables 2-4 and 2-5 list some of the principal design
considerations in roof system selection. An explanation of the headings follow the tables. These
tables are not all-inclusive but contains many criteria that the designer can consider to reduce the
myriad of choices. Systems that fail to meet the principal project design criteria can be quickly
disqualified from further consideration. For example, if an existing structure has reached its
design load limit, then heavier roofs (such as ballasted single-ply roofs or concrete tiles) would
have to be disqualified (or the structure would have to be strengthened at significant cost).
2-4
Previous Page
