building capping cleaning cover covered covering danger dangers ear protection edge exterior external height high high-pressure improvement maintenance pressure pressure-cleaning renovating renovation repairs restoration restoring risks risky roof roof-area roofing rooftop safety skies sky spray sunlight sunshine tiles tiling tools tough water wet work workman angles architectural architecture business color colour commercial decoration decorative different distinctive edges geometric geometrical green greenery high-rise light lighting lines modern on-the-outside perspectives plants rooftop-gardens shadows shape shaped shapes Singapore stained-glass trees unique unusual views white windows Australia background brickwork chimney-stacks chimneys city cottage early heritage historic house maintained old pioneers preservation Preserved restored Settlers shade shrubbery shrubs steps stone stones stonework structure surfaces texture textures wall walls wooden wooden-tiles workmanship appearance construction edging elements linear orange patterns placement roofwork rooves rows stack stacked stacks style surface terracotta