Hail: It's often difficult to determine whether or not a shingled roof needs to be replaced after a hail storm because damage is not readily evident to the average eye. Hail can damage your shingles, siding and gutters without any visible signs from the ground. If your hail was golf ball size or larger---it more then likely broke through your shingle and caused bruising. If driven by high winds or if it hailed for more than a few minutes, your roof has more then likely suffered from loss of it's protective granules. Granules aren't just there for appearance purposes, they're there to protect the asphalt based roof product (the shingle). Asphalt and the sun do not mix. The sun will beat it up pretty badly. It doesn't take much of a hail storm to dislodge a bunch of granules, thereby exposing the asphalt and shortening the service life of your roof. If your roof has gone through a moderate to heavy hail storm---it is very important to have your roof inspected for hail damage. Loss of granules on the shingle will cause the organic-based center of the shingle to be exposed to the suns UV rays. This causes quick and serious deterioration to the shingle. It's easy to spot the damage when the hail actually puncture's the shingle---but, it's just as important to know when the shingle has been bruised. Ignoring the potential damage and allowing sun, rain, wind, snow & ice to beat against the damaged shingles can cause a serious continual cycle of damage to your roof and by the time you realize the damage has happened it may be too late to claim it on your insurance. Have the exterior of your home inspected. Better safe then sorry.
Enemies of Your Roof.
A roof’s performance is affected by numerous factors. Knowing about the following will help you make informed roof buying decisions.
Sun: Heat and ultraviolet rays cause roofing materials to deteriorate over time. Deterioration can occur faster on the sides facing west or south.
Rain: When water gets underneath shingles, shakes or other roofing materials, it can work its way to the roof deck and cause the roof structure to rot. Extra moisture encourages mildew and rot elsewhere in a house, including walls, ceilings, insulation and electrical systems.
Wind: High winds can lift shingles' edges (or other roofing materials) and force water and debris underneath them. Extremely high winds can cause extensive damage.
Snow and Ice: Melting snow often refreezes at a roof's overhang where the surface is cooler, forming an ice dam. This blocks proper drainage into the gutter. Water backs up under the shingles (or other roofing materials) and seeps into the interior. During the early melt stages, gutters and downspouts can be the first to fill with ice and be damaged beyond repair or even torn off a house or building.
Condensation: Condensation can result from the buildup of relatively warm, moisture-laden air. Moisture in a poorly ventilated attic promotes decay of wood sheathing and rafters, possibly destroying a roof structure. Sufficient attic ventilation can be achieved by installing larger or additional vents and will help alleviate problems because the attic air temperature will be closer to the outside air temperature.
Trees and Leaves: Tree branches touching a roof will scratch and gouge roofing materials when the branches are blown by the wind. Falling branches from overhanging trees can damage, or even puncture, shingles and other roofing materials. Leaves on a roof system's surface retain moisture and cause rot, and leaves in the gutters block drainage.
Missing or Torn Shingles: The key to a roof’s effectiveness is complete protection. When shingles are missing or torn off, a roof structure and home or building interior are vulnerable to water damage and rot. The problem is likely to spread-nearby shingles also are ripped easily or blown away. Missing or torn shingles should be replaced as soon as possible.
Shingle Deterioration: When shingles are old and worn out, they curl, split and lose their waterproofing effectiveness. Weakened shingles easily are blown off, torn or lifted by wind gusts. The end result is structural rot and interior damage. A deteriorated roof system only gets worse with time-it should be replaced as soon as possible.
Flashing Deterioration: Many apparent roof leaks really are flashing leaks. Without good, tight flashings around chimneys, vents, skylights and wall/roof junctions, water can enter a home or building and cause damage to walls, ceilings, insulation and electrical systems. Flashings should be checked as part of a biannual roof inspection and gutter cleaning. .