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Paneling and Uppers called for 4x8 beams 4 feet o.c. and 2.4.I tongue-and-groove. Materials, including nails, came to $601. But his labor cost, for 15 man hours-z3 less than the conventional methodwas only $47. Total cost: $648.

Brandon expressed considerable satisfaction with the system, {rom several angles.

"It's pretty hard to justify a conventional floor," he said. "The money we saved makes a difference, it's true, but the convenience and dependability of the surface may mean a lot more. Buyers are impressed with that basement ceiling."

Bigger Savings

Wallace Courtnev. a home builder east of Seattle's Lake Washington, claimed larger savings than Brandon, but his report was not as detailed. He figured a saving of about 13f cents per square foot, which would have amounted to more than $200 on Brandon's job. His comparative cost figures were based on 2x6 tongue-and-groove decking supported on 4x10 timbers 4 feet o.c.

But that wasn't all Courtney gained from the new tongueand-groove 2.4.1.

"I have achieved a much better, neater and more finished looking job with this material than with any other material I have used," he said.

Special Joint Needed

Ifess emphasizes that the close-tolerance, shaped joint is necessary to develop sufficient strength for general purpose residential floor construction.

"The joint is engineered to minimize differential deflection -between panels under traffic, so as to protect the thin finish flooring used by so many builders. Load tests show the floor will take concentrated loads up to 1,500-pounds.

"Some builders have tongue-and-grboved their own panels," Hess says, "but we've never tested a conventional t&g joint in this application that was permanently satisfactory for a floor."

Accuracy and tolerances in machining the tongue-andg'roove will be subject to the same high standards of quality control DFPA applies to grading of veneer and durability of the glueline.

For further information and technical data, write Douglas Fir Plywood Association, Tacoma 2, Wash.

Mills with availeble stocks of the item include GeorgiaPacific Corp., Toledo, Ore.; International Paper Co., LongBell Division, Longview, \Mash., and U. S. Plywood, Mapleton, Ore.

Producers accepting orders include Durable Plywood Co., Arcata, Calif., and St. Paul & Tacoma Lumber Co., Tacoma, Wash.