UFC 3-110-03
26 September 2006
3-4.5
Snow Guards.
Provide snow guards in cold climates where required.
3-4.6
Roof Cement.
Use polymer modified bitumen roof cement.
3-4.7
Underlayment.
Use polymer modified bitumen membrane as underlayment.
3-5
SLATE ROOFING.
Slate roofing materials are extremely long lasting but expensive. Consider slate only
when it is required for architectural compatibility with adjacent buildings. In order to
receive full value for the use of slate roofing, other building materials should provide
comparable longevity. Slate should also be limited to buildings having a long projected
life without the need for significant exterior modification. A structural analysis must be
made prior to installing slate where other roofing systems were used before. Only slate
conforming to ASTM C406-00 Standard Specification for Roofing Slate may be used.
3-5.1
Roof Cement.
Use polymer modified bitumen roof cement.
3-5.2
Underlayment.
Use polymer modified bitumen membrane as underlayment.
3-6
OTHER STEEP SLOPE ROOFING.
Other roofing materials are presented in the NRCA Manual. Designers who chose to
specify these materials must research the products and demonstrate their life-cycle cost
benefits.
3-6.1
Metal Shingles and Panels.
While metal shingles and metal panels offer some advantages in appearance and wind
and fire resistance over other steep roofing products, the potential for corrosion must be
considered. Prior to specifying these products, the designer must demonstrate the life
cycle cost benefits by confirming with actual case histories the longevity of these
materials in similar service conditions.
Do not use metal shingles and metal panels in areas where the average rainfall
exceeds 380 mm (15 in.) per year, and in areas where extreme freeze-thaw cycles
occur, unless there is good empirical data to support performance estimates. The
manufacturer's warranty may not be used to support performance claims.
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