Not less than 10 clear on 16 shingles 11 clear on 18 shingles and 16 clear on 24 shingles.
Certigrade handbook of red cedar shingles.
Class c shakes and shingles are identified by their blue certi guard label.
Certigrade handbook of red cedar shingles unknown binding january 1 1964.
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Publication date 1957 usage public domain mark 1 0 topics shingles catalogs roofing catalogs division 07 wood shingles wood siding publisher red cedar shingle bureau collection.
Page 00 introduction new roof construction manual certi label products download pdf page 01 certi label products certi label cedar shakes certigrade cedar shingles download pdf page 02 certi label products pressure impregnated treated products certi guard fire retardant treated cedar shakes shingles certi last preservative treated cedar.
Class b shakes and shingles are identified by their red certi guard label.
Flat grain and limited sapwood are permitted in this grade.
Details the quality of timber and workmanship required by the red cedar shingle bureau for different grades of certigrade shingles.
They are a low maintenance product that adds beauty texture durability and insulating qualities to either new construction or remodeling and renovation of existing structures.
The certi guard label identifies cedar shakes and shingles which have been pressure impregnated with fire retardant polymers to provide permanent fire protection.
And gives recommendations fully illustrated for applying shingles with sections on roof pitch spacing nails applying a new roof or wall over an old one ventilating enclosed areas the use of stains and paints and the durability wind and hail.
Western red cedar with its freedom from checking and warping combined with light weight and extreme durability is the ideal shingle wood and the rigid inspection of the red cedar shingle bureau insures proper manufacture.
The result is the certi grade shingle.
A good grade for many applications.
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Centigrade handbook of red cedar shingles paperback january 1 1947 by bror l.
Certigrade 1 18 r r sidewall shingles rebutted rejointed shingles are manufactured specifically for exterior and interior wall surface uses.