Here is the 20 point roof inspection check list:
Here are the 13 most possible spots you should take a look first:
Damaged or improperly installed flashings around chimneys causes the most leaks in homes. Even a hairline crack above the flashing can cause a serious water leak.
A loose nail which has backed 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 your shingles, also known as bare spots, can also cause leaks. If they do not, they are a sure sign that they will in the 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 and failing to properly cut them causes water leaks at the roof valleys.
Some plumbing vent flashing incorporate aluminum and rubber seals. Look for cracks in the rubber seal around the plumbing pipe. Some seals do not hold well to ultraviolet radiation and fail in about 10 years.
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. Look for rust or holes in these flashings.
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 it from happening install ice dam membranes under your shingles.
You will see this type of water leak during rains coupled with heavy winds. To prevent it 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 not addressed.