A roof with asphalt shingles can endure two layers just before complete substitution will become required. Flat roofs with either an EPDM or TPO membrane is usually re-roofed with just one further layer. In case your roof has already been re-roofed or is often a metal roof, it is possible https://localmetalroofers11099.blog-eye.com/28887437/the-greatest-guide-to-local-metal-roofers