Asphalt Vs. Fiberglass Rolled Roofing
Rolled roofing systems are installed using long sheets of material rather than traditional shingles or tiles. They are considered a single-ply membrane, which means that only one layer of material is installed over the roof surface, rather than multiple layers. These rolled roofs are available in asphalt or fiberglass versions, with each offering its own benefits and features for homeowners to consider.
Features
Rolled asphalt roofing is very similar to asphalt shingles. It is made from an organic mat, usually felt, which is saturated in a petroleum by-product known as asphalt. It is then covered with small particles of gravel or rock, which is known as a bituminous coating. Fiberglass roofing is made from fine glass fibers pressed together to form dense mats, then coated with asphalt or resin. The bottom of the fiberglass roofing is coated with a mineral like talc or gypsum.
Benefits
Asphalt rolled roofing is one of the cheapest roof coverings available. It is quick and easy to install and helps to protect a roof structure from moisture and other external elements. Fiberglass is still relatively affordable but is more expensive than asphalt. Its densely woven mat and mineral coating offer more strength and tear-resistance than asphalt while helping to protect against ultraviolet ray damage.
Drawbacks
Whether you choose fiberglass or asphalt rolled roofing, neither of these products can be expected to last nearly as long as other roof products. Fiberglass may protect the home successfully for five to 10 years, while asphalt is considered a temporary roofing material. Asphalt is highly susceptible to tears and damage from wind, weather and other causes.
Considerations
Rolled roofing is often the best choice for those on a tight budget. Asphalt should only be installed on steeply sloped roofs, as it tends to fail easily on flat or low-sloped structures. It is also a good option for temporarily covering the roof while doing work on the house, or for covering roofs on sheds or outbuildings. Fiberglass can be used on low or high-sloped roofs, but is often installed in a double layer on flatter roofs. This double layer of rolled roofing is known as a selvage roof and is sold in rolls that are 19 inches wide.
Installation
Fiberglass or asphalt rolled roofing should be installed over plywood or OSB roof sheathing. The sheathing must be covered with building paper or roof felt to act as a vapor and moisture barrier, which is stapled or nailed in layers across the surface. Installers should start at the eaves of the roof by placing a drip edge for extra protection. The bottom of each layer of roofing is adhered using lap cement, and the top is nailed using a blind nailing technique. Each row is overlapped by approximately 6 inches to help prevent leaks and moisture penetration.
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