The results indicated that commonly used foam plastic roof msula tions will be damaged if exposed to foot traffic, and that their protection with fi brous overlay boards as recommended by roofing contractor associations [1,2] con tinues to be good roofing practice. The results also indicated that finished roof surfaces will be damaged if exposed to frequent roof traffic and that surface protec tion of the membrane is good roofing practice.
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References
1.
National Roofing Contractors Association (NRCA), Bulletin #9, NRCA Statement on Polyisocyanurate, Polyurethane and Phenolic Foam Roof Insulations, Technical Developments , Rosemont, IL, September, 1988 .
2.
Canadian Roofing Contractors' Association (CRCA), Technical Bulletin, Volume 38, Fibreboard Overlays, CRCA, March 1993 .
3.
Smith,T.L., Research Review, Polyisocyanurate Insulation, NRCAction, NRCA, Fall 1997
4.
Smith, T.L., Research Review, Polyisocyanurate Insulation, NRCAction, NRCA, Spring 1998
5.
BS5400 Steel, concrete and composite bridges Part 2.1978 Specification for loads, British Standard, 1978
