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flashing light signal warning beacon safety led roof waterproofing installation electrical hazard strobe visibility blinking emergency indicator protection weatherproof roofflashing chimney gutter waterproof metal seal flash roofedge skylight flashingstrip corrosion weather water damage roofseal leak repair maintenance building code construction structure joint flashingmaterial aluminum copper rubber base asphalt shingles edge overlap adhesive caulking roofjoint moisture roofprotection sealant installationguide vent roofpenetration stepflashing kickoutflashing headwall siding roofvalley roofleak waterintrusion roofsurface roofedgeflashing stepinstallation