angles appearance architectural building construction cover covered edge edges edging elements exterior external height high light linear lines maintenance modern orange patterns perspectives placement renovating renovation repairs roof roof-area roofing rooftop roofwork rooves rows shade shadows shape shapes stack stacked stacks style surface surfaces terracotta textures tiles tiling work capping cleaning covering danger dangers ear protection high-pressure improvement pressure pressure-cleaning restoration restoring risks risky safety skies sky spray sunlight sunshine tools tough water wet workman