15.5. Roof Cladding Fire Resistance: Class A

Report Number: SwRI Project No. 01.13537.01.332

Report Date: 7 January 2009

Test Date: 19-20 November 2008


A Typical Copper Standing Seam roof system was subjected to testing in accordance with ASTM E108.07a “Standard Test Methods for Fire Tests of Roof Coverings”, meeting the Class A requirements for roof coverings.

The objective of the ASTM E 108.07a test method is to measure the relative fire resistance characteristics of roof coverings under a simulated fire originating outside the building. This standard is used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions.  However, results of this test may be used as elements of a fire risk assessment that takes into account all of the factors, pertinent to an assessment of the fire hazard of a particular end use.  The results apply specifically to the specimens tested, in the manner tested, and not to the entire production of these or similar materials, nor to the performance when used in combination with other materials.

Specimen Description

In ascending order, Typical Standing Seam Copper roofing system consisting of:

  1. 23/32 in., 5 ply, A-C grade plywood decking.
  2. Type II (No. 30) asphalt-saturated organic felt fastened only as necessary to hold in place, with staples.
  3. Red Rosin paper fastened only as necessary to hold in place with copper nails.
  4. Standing seam panes made from 16oz copper with interlocking seams. The seams were crimped with a crimping tool upon installation onto the deck.  Copper cleats were installed on the deck with 1 ¼ in. copper nails. Cleats were spaced 12 in. on center.

Classification Criteria - Class A tests are applicable to roof coverings that are effective against severe test exposure, afford a high degree of fire protection to the roof deck, do not slip from position, and do not present a flying brand hazard.

To be regarded as Class A, a roofing system shall meet the requirements of eight tests:  four burning brand tests, two Spread of Flame tests, and two Intermittent Flame tests.

RESULTS: Copper Copper Development Association’s Typical Standing Seam roof covering met the Class A requirements of Class A of ASTM 108-07a.