Usage of the insulating foam covering steel studs can be considered as one of construction methods helping in reduction of the contact area between studs and the sheathing. Such insulation reduces also a transverse heat transfer through stud flanges. Transverse heat transfer increases heat losses in steel framed structures and were measured and reported by H. Trethoven. Covering foam shapes add highly efficient thermal insulation in locations only where it is strongly needed (steel stud areas). This reduces thermal bridge effects. At the same time, the wall cavity is insulated by traditional insulating batts.
During 1994, steel framed wall, containing 1-in. (2.5-cm.) thick foam shapes covering steel studs, was designed and tested by the ORNL BTC staff.
Material configuration of the 8 x 8-ft. wall section which was used for hotbox testing was as follows:
Plywood - 0.5-in. (1.3-cm.),
Steel studs 3-5/8" (9.2-cm.) installed at 24" o.c.(61-cm.),
Local stud insulation - 1-in. (2.5-cm.) thick EPS foam,
Wall cavity insulation - R-19 insulation batts, and
Plywood - 0.5-in. (1.3-cm.)
FOR MORE INFORMATION CONTACT: Dr. Jan Kosny