Masonry Magazine April 1974 Page. 28
Urethane Foam Insulates MIT Dorm
Thermal efficiency and elimination of the need for trowelling of mastic were among the principal reasons that urethane foam was used to insulate the walls of the 16-story undergraduate dormitory of the Massachusetts Institute of Technology in Cambridge.
Exterior of the Frank S. MacGregor House, designed for M.I.T. by The Architects Collaborative of Cambridge.
Use of laminated urethane foam boardstock as insulation for the cavity walls of Frank MacGregor House, a new dormitory at Massachusetts Institute of Technology, eliminated the need for a trowelled-on mastic and also provided excellent thermal resistance with just one inch of material with Pietro Belluschi of Boston, is brick veneer with white concrete spandrels. The cavity walls are brick with a masonry block back-up.
By wedging 1" laminated urethane foam panels on brick ties in the cavity walls, the job of trowelling the mastic that is required as an adhesive for an ordinary slab insulant was elimated. The panels are backed with aluminum foil. Applying mastic to 20,000 sq. ft. of wall surface not only would have been time-consuming and costly, an official of Jackson Construction Co., Needham, Mass., pointed out, but there was also a chance that the mastic would stain the building's decorative concrete spandrels.
Urethane's superior insulating ability-1" has the thermal resistance of 1.6" of glass fiber or 2" of polystyrene-made it possible to use only half as much insulant as would otherwise have been required. The urethane foam panels, which were manufactured by Apache Foam Products, a division of Millmaster-Onyx Corp., were supplied by Dyrelite Corp., New Bedford, Mass. and installed by G. Salvucci Co. (MCAA), Newton, Mass.
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Adhesive Mortar
(Continued from page 24)
techniques," says Winchester. "But with Threadline the block walls, later faced with flamingo brick accented with patches of black brick, went up without a hitch."
With this experience behind him, Winchester performed a similar selling job on the new Holiday Inn in Indianapolis, for which he was the mason contractor. He worked in cooperation with Carrick & Bell, general contractor, and Coller Schubert & Associates, a local architectural firm involved in final details for the project.
In the Holiday Inn job, brick and stucco were used to face the block. According to plasterers on the project, the thin bed joint of Threadline allowed smooth and fast application of the thin coating of plaster. In conventional block construction, the mortar absorbs water from the plaster, leaving visible seams which have to be covered with additional coats of plaster. Only a 4 base coat of plaster was required for the stucco on the Holiday Inn project because there are no block joints to absorb moisture from the stucco. The 180-unit Holiday Inn was started in August, 1972, and finished just eight months later.
A 225-room Marriott Inn in the area, currently under construction, also is utilizing loadbearing exterior walls of concrete block bonded with Threadline. Wade-Rolman Co., Inc. (MCAA) of Indianapolis is the mason contractor on this project.
AFTERTHOUGHTS ON SAFETY
But that's the way I've always done it (before this accident).
I never thought my hard-hat would protect me against such an accident. (This headache is much better than a busted head.)
I saw that board with the rusty nails sticking thru carlier. (Boy, these tetanus shots sting.)
I never realized a fire could get out of control so fast. (If I'd replaced that empty extinguisher yesterday-I'd be working here tomorrow.)
Oh, I know they're always preaching we should lift with the legs and not the back. (Wonder how long I'll have to remain in traction?)
I'll be off work 2 weeks. I had to ruin a good shoe by cutting off the toe, and this fractured toe still hurts. (For a lousy $1.29 more I could have bought those safety shoes.)