Research Project Summary Information
Green and Energy Efficient Building(ST11171-1)
Newport Ventures, Inc.
When insulating a steel framed exterior wall in cold climates, it is usually necessary to provide continuous insulation on the exterior of the studs to reduce the effect of thermal bridging. As energy codes continue to become more stringent, the thickness of the continuous installation has increased. The increased insulation thickness, however, introduces several problems for building designers, such as window and door jambs needing to be extended, siding manufacturers’ warranties being voided when more than one inch of continuous insulation is used, and heavier siding products causing fasteners to fail under their weight.
Newport Ventures will review building codes to identify state-wide design cladding loads for setting performance requirements for fasteners. Newport Ventures will assess constructability issues to ensure proposed fastener solutions are adoptable by building trades. A prescriptive table of fasteners will then be developed for attaching various claddings to framing over continuous insulation for common building types. Newport Ventures will then develop a code proposal for the Department of State based on this project’s results.
Adding continuous insulation to steel framed buildings can reduce heating and cooling energy consumption by 10 to 15 percent. Continuous insulation can also significantly reduce air leakage in building envelopes.
This project developed specifications of fasteners for use on up to four inches of continuous rigid insulation. These conclusions were submitted to the Energy Conservation Construction Code of New York State (NYECCC) as part of this project. Prescriptive tables from the report have been included in the 2010 NYECC, scheduled for adoption December 14, 2010. The project’s findings validate the use of up to four inches of continuous rigid foam insulation over steel studs. Projects results may also be incorporated into an American Iron and Steel Institute standard (S100AISI S200-07, “North American Specification for the Design of Cold-Formed Steel Structural Members”).
Newport Ventures, Inc.
22 Jay Street
Schenectady, NY 12305
Building Construction Methods
NYSERDA Contact Information
R&D - Buildings Research