The sky's the limit
Article Abstract:
Algae-resistant shingles have emerged as a favorite residential roofing product by both consumers and roofing contractors. The minimal to sometimes dangerous problem posed by algae staining in the US has led to 30 years of research by Minnesota Mining and Manufacturing Co. That research concluded with asphalt shingles using metals to prevent staining, particularly with Gloecapsa magma, the main algae type found on roofs.
Publication Name: Roofing Siding Insulation
Subject: Construction and materials industries
ISSN: 0033-7129
Year: 1998
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Working all the angles
Article Abstract:
DeWalt, Makita, Milwaukee and Rigid brands of right-angle drills were compared in terms of their physical features, handling and performance in two classes; heavy-duty and medium-duty. All of the right-angle drills are built with durable clasps and handles. The drills rate from 13 amps and turning at 450 and 1,750 rpm to a moderate 7 amps at 400 rpm. Other findings of the performance test are presented.
Publication Name: Tools of the Trade
Subject: Construction and materials industries
ISSN: 1534-2425
Year: 2007
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