Common Causes of Roof Leaks – Family Roofing

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Common Causes of Roof Leaks

When you’re trying to track down a leak, start by looking at the roof uphill from the stains.  The first thing to look for is any roof penetrations.  Items that penetrate the roof are by far the most common source of leaks.  In fact, it’s rare for leaks to develop in open areas of uninterrupted shingles even on older roofs. Penetrations can include plumbing and roof vents, chimneys, dormers or anything else that projects through the roof.  They can be several feet above the leak or to the right or left of it.  If you have attic access, the easiest way to track down a leak is to go up there with a flashlight and look for the evidence.  There will be water stains, black marks or mold.  Your best bet is to call a roofing professional!

Below are possible problem areas:

Fix Plumbing Vent Boots

Plumbing vent boots can be all plastic, plastic and metal, or even two-piece metal units.  Check plastic bases for cracks and metal bases for broken seams.  Then examine the rubber boot surrounding the pipe.  That can be rotted away or torn, allowing water to work its way into the house along the pipe.  Call a roofing professional to replace the vent boot.

Broken or Missing Shingles

Brittle, aging shingles can fall off the roof completely, leaving your roof vulnerable when rain, snow, or hail hit. Homeowners should routinely inspect their roofs and watch out for any missing shingles.

Clogged Gutters

It’s common for falling leaves, sticks, and dirt to get stuck in gutters.  When this debris builds up, the rainwater and melting snow won’t be able to freely drain or fall away from the house, and it could lead to a leaky roof.

Chimney Damage

If you have cracks or other damage to your chimney, water may seep through and even pool up, which could cause structural damage to your home.  This is why early detection of chimney damage is an important part of avoiding a leaky roof.

Roof Vents

Roof vents are essential for letting heat and moisture escape from your attic, but they can also be a cause of leaking if they are damaged or sealed improperly.

Condensation in the Attic

During the cooler months, warm air will drift up to the attic and could cause condensation if it cools down quickly.  This condensation can cause roof leaks and even mold if ignored.

Your Flashing Has Cracked

Roof flashing directs water away from important parts of the roof, but it can also be a spot that’s vulnerable to roof leaks. Regularly check flashing for cracks and damage, making sure it’s properly sealed.

Improperly Sealed Valleys

A roof valley (the point where two sloped roofs meet) is designed to help water flow off of the roof.  But if the valley isn’t properly sealed, this can be another site of roof leaks.

Skylights

Skylights may be a nice way to let natural light into your home, but they can also be a common cause of a leaky roof.  Make sure your skylights are fitted and installed properly to avoid water damage to your home.

Most roof leaks are caused by five common factors: people, issues with seams, neglect, rooftop equipment, and weather. Prevention is of course better than repair.  Once you get to know the main offenders, you can develop a strategy to avoid problems before they arise.

People: It’s OK to walk on your roof.  Roofs can tolerate modest foot traffic, but heavy traffic can be a problem on membrane that isn’t protected with walk pads — especially around equipment like HVAC systems.  The biggest danger is human error or carelessness, like dropped tools or mishandled parts.

Seams: Seams are often your roof’s weak point.  Large rolls of membrane are rolled out over the vast expanse of a roof. Depending on whether the roof is fully adhered or mechanically fastened, those membranes are secured to either the insulation or deck below.  No sheet is as wide as a roof, so multiple sheets must be overlapped and joined, either with adhesive or hot-air welding.  In flat, open spaces, these seams hold up well, but at the edges of the roof and especially around flashing, pipes, or at the site of an older patch — delamination can lead to a roof leak.

Neglect: Ignoring a roof has disastrous consequences.  Failure to maintain and inspect your roof can lead to leaks at weak points. Pitch pans and caulking can dry out, crack, and let water seep in.  Regular monitoring and resealing when necessary can prevent leaks and further damage down the road.  Without regular maintenance, minor issues can balloon into systemic problems that necessitate a full re-roof or, worse, structural work.

Rooftop Equipment: The areas near heavy equipment like HVAC units and exhaust fans are often the site of punctures and leaks.  Screws can be pulled out, and washers or gaskets can dry rot, all creating potential entry points for water. Ventilation isn’t waterproof, and hard, driving rain can get through HVAC access panels.

Weather: Last but not least is constant exposure to the elements. Ice and snow can build up over gutters and drains, leading to ponding water.  In some parts of the country, violent hurricanes or tornadoes can demolish a roof in a single blast.  More commonly, however, the slow, steady falling of rain, snow, and hail has a cumulative impact over time.  The sun beats on the roof almost everyday.  Storms can whip tree branches, limbs, and other debris at mercilessly high speeds. Periods of intense heat, prolonged cold, and wild temperature swings can all degrade roofing material as well.

People, weakness at the seams, neglect, rooftop equipment, and weather are the five most common culprits behind many roof problems.  Not every roof leak can be attributed to one of the big five, but if you can keep an eye on these hazards and better understand how to identify and prevent them, you’re on your way to having a problem-free roof for a much longer time.