Open Valley: a method of valley construction in which the steep-slope roofing on both sides are trimmed along each side of the valley, exposing the valley flashing.

 

Organic: being or composed of hydrocarbons or their derivatives originating from plant or animal matter.

 

Organic Felt: an asphalt roofing base material manufactured from cellulose fibers.

 

Organic Shingle: an asphalt shingle reinforced with material manufactured from cellulose fibers.

 

Overspray: undesirable depositions of airborne spray loss.

 

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