Read Before You Redo Your Roof
This is a great article on This Old House Website on Shingles that compliment your house, choosing the right shingle and the differences,overlay vs. tear-off, parts of roof project and much more!
Excerpt of Article from This Old House “Read Before You Redo Your Roof”
All Under One Roof
While the shingles are all you see, a hard-wearing roof is considered a system with many parts that work together to keep your house dry and comfortable. The focus is not just on keeping the weather out but also letting fresh air in to prevent a buildup of heat and humidity in the attic. This is how your contractor will build your roof back up after tearing it down to the 3⁄8-inch plywood sheathing, or roof deck.
1 ICE AND WATER SHIELD
A self-adhesive membrane applied along the roof’s perimeter from the eaves up. It should reach 3 feet beyond the inside of the wall and cover any valleys to prevent ice dams and wind-driven rain from reaching the sheathing. To shed water away from the eave, most roofers add a metal drip edge right to the roof deck, covering it with the membrane.
This synthetic layer, which replaces felt paper, covers the entire roof deck and is the second line of defense against leaks, after the shingles.
3 STARTER SHINGLES
A narrow row of asphalt roofing, the starter strip is nailed to the perimeter of the roof with a bead of adhesive on top that grips the underside of the first course of shingles, keeping them in place during high winds.
4 RIDGE VENT
Roofers use a circular saw to cut a long slot along the roof ridge—if there isn’t one—then cover it with a plastic flap (as shown) or a flexible vinyl matrix. Openings along the sides allow air out of the attic, cooling the space and lowering your air-conditioning bill.
Venting prolongs the life of the roof. In most cases, cool air is drawn in through soffit vents, and warm air is released through a ridge vent.
Applied from the eaves up toward the ridge, shingle courses are staggered to prevent water from seeping in. Roofers also weave aluminum flashing in while shingling against vertical structures, like a chimney, dormer, skylight, and around vent pipes.
6 RIDGE CAPS
Finished in the same colors as the other shingles, these caps are square sections installed over the ridge vent, straddling vulnerable parts where two planes of the roof meet.
Call us before you Redo Your Roof for a quick competitive quote!