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Why does one side of my roof wear faster?

The southern slope of a roof will typically wear faster than the other roof slopes as it receives the most sun exposure. Over the life of a roof system, UV rays will slowly break down the roofing material. Also, inadequate ventilation will add to this premature deterioration.

Why does water drip down between my shingles and eavestrough?

The most common cause as to why water is dripping behind a gutter system is because there was no drip edge installed. Drip edge is a key component to any roof system. Drip edge is a metal flashing installed under the first row of shingles on an eaves edge. Drip edge has a projecting lip which directs the flow of water into the gutter system.

Drip edge should be installed underneath the ice and water membrane, which also provides an extra bonding agent for the proper adhesion of the ice and water.

Can a new roof be installed over old shingles?

You should never install new shingles over an old roof system. This can void a new roof warranty. It can also cause unusual shapes to form and the new roof will not look smooth and level.

If the old roof is not removed, it will be impossible to inspect the decking for rot or deterioration that can become a much larger problem if not dealt with. Moisture from the previous roof system can be trapped under the new system and increase surface temperature from having two layers of shingles can accelerate roof aging.

Where should ice and water membrane underlay go?

The purpose of ice and water underlay membrane is to stop water from passing through the roof system into the home. Ice can build up on a roof slope, usually at the unheated area at the eaves, forming an ice dam that prevents water from draining off the roof. In turn, this water can creep up under the shingles causing a roof leak.

Ice and water membrane must be installed far enough up the slope to cover the first foot or so of heated space.
Ice and water membrane should be installed at least three feet up the slope of the roof from the eaves, on 4/12 and greater pitch, and 100% coverage on pitches less than that is recommended.

Can I use different types of vents on my roof?

No. Proper ventilation of a roof system occurs when the soffit area at the bottom of an attic pulls air inwards and the roof vents in the top of the attic space release air for complete attic air transfer. When using multiple types of roof vents, a stronger roof vent can cause a weaker roof vent to become an intake. The weaker vent can begin to pull outside air inwards rather than release air from the attic space and can result in a reduction in air transfer

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