20091215150647901.pdf11) C. I S 9 11
GARY HAAKENSON
CITY OF EDMONDS MAYOR
121 5TH AVENUE NORTH - EDMONDS, WA 98020 - (425) 771-0220 - FAX (425) 771-0221
Website: www.d.edmondsma.us
DEVELOPMENT SERVICES DEPARTMENT
Planning - Building - Engineering
December 15, 2009
Greg and Kathy Brewer
658 Maple Street
Edmonds, WA 98020
RE: Use of Comfort Foam 178 Insulation System at 658 Maple Street, Edmonds
Dear Mr. and Mrs. Brewer:
The Office of the City Building Official is in receipt of your request for Alternate Materials
Method of Construction, Design or Insulating Systems as set forth in WSEC 103 to use Comfort
Foam 178 Insulation System for roof insulation.
Section 502.1.4.3 of the 2006 Washington State Energy Code requires ventilation between the top
of the insulation and roof deck. Comfort Foam 178 System is installed directly to the underside
of the roof deck without this air space.
The 2004 Supplement to the International Residential Code and proposed Washington State
Energy Code Amendments support the installation of air impermeable insulation to be applied
directly to the underside of the roof deck. Comfort Foam 178 System is air impermeable (ASTM
E283 with less than 0.02 LIS -m2). Product has also been evaluated by ICC in report ESR -2642.
After review of all of the information provided, it is my determination as Building Official for the
City of Edmonds that the use of Comfort Foam 178 Insulation System is approved as an Alternate
Materials Methods of Insulating Systems for roof insulation under the provisions of WSEC 103 at
658 Maple Street, Edmonds with the following conditions:
• The product must be installed in accordance with the manufacturer's installation
instructions and ICC ESR -2642
• The unvented attic space is completely contained within the building thermal envelope.
• No interior vapor retarders are installed on the ceiling side of the unvented attic
assembly.
The installation meets the minimum R -value for ceiling insulation as required in the
Washington State Energy Code.
Sincerely,
NA ---14
Ann Bullis, CBO
Building Official
Incorporated August 11, 1890
Sister City - Hekinan, Japan