OIDAR S]|I}I OLIS SAFE AOAI}I ST l3O.]Y|ILE OALE

Tests Reveql Cedqr Shingle Superiority

"These wind tunnel tests, made under controlled conditions simulating those actually experienced in normal constluction and use, provide scientiflc support to the excellent record ol wind resistance which has been established over many years by cedar shingle rools in this courrtry," said \tr. W. Woodbridge, Secretary-Manager of the Red Cedar Shingle Bureau, "Large areas of the United States, particularly the Middle West, the Atlantic seaboard and the Gulf Coast regions, periodically are visited by windstorms of considerable intensity. Cedar shingle rools invariably weather these storms in excellent shape."

Wind tunnel's hurricone velocity foils to dislodge shingles

A wind velocity of 136 miles per hour, greater than that experienced in any general windstorm, failed to disturb or effect in any way a roof panel of red cedar shingles in recent wind-tunnel tests at'the University of Wichita in Wichita, Kansas, it has been revealed by the Red Cedar Shingle Bureau.

Purpose of the tests, acording to the Bureau Secretary-Manager, W. W. Woodbridge, was to determine the actual intensity of wind required to blow off cedar shingles from a typically-constructed roof.

After The Big Blow

"But instead of revealing the amount of hurricane force which is required to cause failure in a cedar shingle roof, the panels successfully resisted the maximum wind velocity which the University of Wichita's wind tunnel could generat+namely, 136 miles per hour. So we still don't know the collapse point, but we do know that it is greater than 136 miles per hour."

The University of Wichita's wind tunnel, normally used for aeronautical research, is a return-flow atmospheric type tunnel with a test section seven feet high and ten feet wide. In this test section, a cedar shingle rooffng panel, slightly larger than five feet by eight feet in size, was installed at a 30-degree angle to simulate normal pitched roof construction. The shingles were No. I Certigrade 16-inch XXXXX, laid at standard ffve-inch weather exposure, with two 3d nails driven into each shingle about six inches above the butt a-nd about one inch from the edges of the shingles. The shingles were applied to 1"x4" sheathing boards, spaced apart on five-inch centers. and nailed over 2"x 4" rafters spaced on 16-inch centers. At the top edge of the panel, shingles were laid crossways at five-inch exposure, to represent normal ridge or comb application.

When it was observed by University engineers wbo conducted the tests that no deformation of any shingles occurred at lower tunnel speeds, the velocity was progressively stepped up to the maximum that could be obtained. Throughout the test there was not the slightest visible deformation of any shingle on the panel.

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Made In The Westi

Southern California Retaileru \flill Meet April 1-6

The Southern California Retail Lultrber Association will hold its annual convention and Trade Show at the Ambassador Hotel, Los Angeles, on Wednesday, Thursday and Friday, April 4, 5 and 6, 1951.

Wednesday morning will be given over to registration and visiting the exhibits, The kick-off luncheon will be Wednesday noon, and in the evening will be the annual banquet and floor show with nationally known entertainers. The Thursday luncheon will be sponsored by the Los Angeles Hoo-Hoo Club, ancl on Thursday evening there will be a dinner dance. Business sessions will be held Wednesday afternoon, Thursday and Friday.

The equipment and products exhibit will be a feature of the three-day -meeting, and it is expected that there will be over 6O exhibits. Lunrbermen are urged to visit these displays.

The ladics arc especially invited to attend and they rnay register without charge,

Iixecutive vice president Orrie \\'. Harrrilton savs: The

Joe Petrcsh Has New Address

Joc Petrash, Southern California rel)resentativc of Gosslin-I{arding I-urnber Company, San Leandro, Calif., h:rs moved his office to 4230 llandini Roulevard, Los Arrgelcs 23. Thc nerv telephone nurnl;cr is ANgcltrs 3-6951.