Our 20-point roof inspection checklist:
Roofing hot-spots - the "Top 13" most problematic areas:
Damaged or improperly installed flashing around chimneys is the number one cause of leaks in the home. Even a hairline crack above the flashing can cause a serious water leak.
A single loose nail that has managed to back itself out of the roof sheathing can be the cause a roof leak.
Water leaks can be caused by cracked or missing shingles. Sometimes missing gravel-like granules on the shingles (known as "bare spots") can also cause leaks. If they have not caused a leak yet, you can bet they will in the very near future.
Furnace vents usually have a metal storm collar, and if the collar becomes loose, water leaks will occur.
Damaged metal flashing or rolled roofing can cause water leaks. Some builders simply lace the shingles together, failing to properly cut them, which inevitably causes water leaks at the roof valleys.
Some plumbing vent flashing utilizes aluminum and rubber seals. Cracks in the rubber seal around a plumbing pipe are often caused by ultraviolet radiation, and these types of seals will fail within about 10 years of installation.
When the roof stops at a vertical wall, a head wall flashing is used to prevent water from leaking into the house. The flashing should extend over the shingles at least three inches and must bend and extend one inch into a mortar joint.
Step flashings are used where a roof climbs alongside a vertical wall. Rust or holes in these flashings can easily cause roof leaks.
Ice dams can block the flow of the water down the roof and cause water leaks, especially at the edge of the roof. To prevent this from happening, install ice dam membranes under your shingles.
You will see this type of water leak during rains that are coupled with heavy winds. To prevent this from happening, install tar paper and ice dam membranes under your shingles.
Chimney bricks can develop cracks and cause water leaks inside your fireplace.
This will cause water to enter behind head flashings and then into your home.
Improper attic ventilation causes water condensation in your attic and, over time, leads to major damage to your roof and attic insulation if it is not addressed.