Charlotte Roofing: Article About Understanding Roof Uplift
Roof uplift is a common problem in regions that experience strong winds. Uplift occurs when the air pressure below the roof is higher than the pressure above the roof. Wind flowing over the surface of the roof creates low pressure while the air seeping through cracks and crevices creates high pressure inside. This uplift can rip a roof right off a house. Fortunately, Charlotte roofing experts know how to reinforce a roof to help keep it in place.
Depending on local building codes, roofing contractors will use a number of methods to anchor a roof in place. A strong roof begins with the trusses or rafters. These are like the bones of the roof system, but they need to be firmly attached. In high wind regions, toenailing trusses and rafters is not sufficient. Areas prone to high winds require corrosion resistant metal connectors. These metal connectors reinforce joints by connecting to boards on both sides of the joint. Common metal connectors include hurricane clips, joining rafters and trusses to load bearing wall and reinforced roof connectors for trusses.
Once the framing is secured, the roofing contractor will take measures to ensure the sheathing will stay on.
A roofing professional from Southern Home Services of Charlotte NC would be happy to answer questions about vinyl siding or fiber cement siding.
Sheathing loss is the most common cause of home damage during a hurricane. If a portion of the sheathing comes off, rain will pour directly into the house, and there will be a greater chance of uplift on the remainder of the roof.
Secure sheathing begins with a solid deck. Whenever possible, the plywood should be at least 5/8 inch thick. Many contractors will use a peel and stick membrane over the seams of the decking material. This is generally preferred to glue adhesives between the joints because it allows the plywood to expand and compress with changing weather temperatures without warping the deck.
If felt underlay is being used on the deck, contractors will often install double layers staggered into overlaps. Tincap metal disks and roofing nails help keep the felt from ripping away from the fasteners in high wind.
In high wind regions, it is important to use shingles that are rated for maximum wind speeds or hurricane wind. For added grip, #8 screws (or screw shank nails) are used every 4 inches around the eaves and the edges of the roof, and every 6 inches throughout the rest of the roof. Staples should never be used on shingles in high wind areas, since a strong gust will pull the shingles off the roof.