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Water Damage in the home: The 5 most common types and fixes

Updated: Apr 20, 2021

Still, waters run deep… especially if you don’t look after leaks in your home properly. Here are 5 common water damage types and what to know.

When it comes to small problems in the home that can rapidly escalate into major issues, water damage is a common and often ignored one. While it's easy to think an innocuous leak in the roof or bathroom tiles isn't such a big deal over time a small leak can be the start of a much bigger problem, from mold, to worse.

To help you stem the tide, here are 5 of the most common types of water damage and what you can do about them.


The signs: Mold growth, timber decay, and a musty smell.

The cause: Poor subfloor ventilation, water pooling under the house, blocked vents.

The solution: First, clear the subfloor of any leaves or rubbish, unblock any vents that may be covered, and check your gutters to make sure water isn't pooling under the house. Then use a moisture meter, or ask an expert with experience in the sort of home you live in for advice.

In a best-case scenario, dehumidifiers or low-voltage damp rods in wardrobes can improve the damp. If this isn't enough, subfloor ventilation such as fans can help. Extra airflow under your property will help–but not fix–a structural timber member if it's in contact with a leaking tap, groundwater, or rising damp.


The signs: Internal and external water stains, problems closing balcony doors and windows due to swollen wood, cracked or missing grout on the balcony, and disgruntled neighbors below you

The cause: Doors that aren't installed correctly, inadequate flashings, poor waterproofing membrane, insufficient drainage, incorrect tile selection, and adhesion are all common,

The solution: To reduce immediate damage, put towels or buckets down to catch water. If you're in an apartment, it's best to contact a water restoration company – treating it yourself could risk voiding any warranty.

The worst case scenario: Never leave balcony issues to deteriorate. Decay can spread, electrical systems can be damaged, and in a worst-case scenario, the balcony could collapse.


The signs: Water stains appearing on ceilings or walls, along with mold and puddles on the floor. Remember, if you have electrical wiring in your attic or ceiling, this situation could become dangerous.

The cause: There are many. No roof maintenance, blocked gutters (box gutters get blocked especially easily), a difference in metals on the roof, which causes corrosion, or punctured or poorly installed sarking under a roof.

The solution: You need to work out where the leak is coming from, which can be much easier said than done. Look for any big, wet area in the roof space. Divide it up and test each area with a hose one day at a time to find the leak.

The best-case scenario for a leaking roof is a tiny hole that is often caused by penetration from a roof vent or plumbing. Use a silicone sealant to temporarily fix it until you engage a professional. Replacing or repairing existing flashing usually helps, but every roof is different.

Worst-case scenario: The worst-case scenario is a leaky roof that's been ignored – it makes the repair harder and more expensive.


The signs: Damp patches on internal walls or ceilings, water collecting around the base of the building, stains, and moss on walls, deterioration to masonry.

The cause: Gutters not being cleaned and badly angled guttering that doesn't allow the water to flow away.

The solution: Clean the downpipe connected to the gutter. Then test the "fall" of the gutter by pouring a bucket of water along with it–if it isn't enough, the water won't flow away, but if it's too steep, the water will overshoot. If this is the case, take it off and re-fix it.

It's a significant result when simple maintenance solves the problem. Worst-case scenarios are often caused by the environment the property is in. The roof had to be redesigned and reinstalled."

Top tip: If you're installing new guttering, add in some safety precautions. Leaf guards and foam water stops under flashing cost a bit more but might save you some heartache in the long term.


The signs: A water level higher than normal when the loo flushes, a shower that doesn't drain freely, a gurgling drain or a sewer smell indicate poor drain and pipe health.

These can cause serious leaks. There are other signs as well. Damp walls and ceilings, tiles falling off the wall, and drops of water on light fixtures can show problems with the waterproofing.

The cause: 85% of blocked drains are caused by tree roots in the pipes. The rest is hair, sanitary products, baby wipes (they don't break down like toilet paper), toilet deodorizers, and, believe it or not, toys and underwear. If a bathroom isn't waterproofed correctly, gravity takes charge, and water finds its way down through a weak point in the floor, walls, or gaps in the sealant.

The solution: Fixing grout or sealant yourself can help, but it's worth getting an expert opinion. Failed waterproofing can cause rotting substructure, bathroom floor collapse, or severe water damage to structures below, so you'll need professional help. Most of the time there's no best-case scenario–failed waterproofing requires a complete strip out of the bathroom and installation of a new membrane.

When it comes to pipes, know where to shut off your water supply, then phone a reputable plumber. In a best-case scenario, a speedy repair is done by knowing where your pipes run. Quite often, access is under driveways, paths, and gardens.

Worst-case scenario: The worst scenarios are in multistorey buildings where access points are built in without any thought to maintenance, which means you'll need new tiles once the pipe's been sorted.

Contact APD ROOFING to help you with these emergency repairs and the long-term solution to protect your home.


Lead Claims Consultant, IICRC Certified

APD Roofing Houston


Office Manager

Marketing Assistant

APD Roofing

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