How do I fix moisture in my house?

How do i fix moisture in my home?

Excess moisture in your home can lead to mould, mildew, structural damage and create an unhealthy living environment. Understanding the root causes of dampness and moisture ingress allows you to tackle the problems at the source. Here are some of the main culprits of moisture in Australian homes and solutions to remedy the issues.

Leaking Roofs

One of the most common causes of moisture is a leaking roof. Old cracked tiles, damaged flashings around chimneys, and deteriorating roof seals can all allow water intrusion after heavy rains. Listen out for drips inside the house after wet weather as a telltale sign you have a leak. Getting on the roof yourself to inspect for cracked or missing tiles is one DIY step, but for full waterproofing, engage a licenced roofer to overhaul the entire roof covering and flashing. Resealing or replacing roof materials provides long-term moisture protection.

Plumbing Leaks

Leaking water pipes, fittings and appliances like hot water units can generate moisture. Drips from fittings may evaporate quickly but over time leak enough to create dampness and mould in walls or ceilings. Listen for running water sounds behind walls to pinpoint concealed leaks. Get a plumber in to inspect all visible plumbing fittings and pipes for wear, cracks and loose joints. Repairing or replacing leaking plumbing fixtures solves the moisture source.Also monitor appliances like dishwashers for any leaks.

Rising Damp

Ground moisture can rise up into walls through capillary action creating rising damp. This is common in old homes with no damp proof course (DPC) installed. Signs include a ‘tide mark’ pattern of moisture on lower walls, crumbling plaster and salt deposits. Installing an effective chemical DPC injection system around the home’s footprint stops rising damp in its tracks.

Faulty Drainage

Poor drainage around the perimeter of your home allows water to pool near foundations and seep in. Check downpipes discharge rainwater away from the house and the ground slopes away from slab edges. Improving drainage may require regrading soil, extending downpipes, installing agricultural drains or adding a soak well. Keeping soil dry around the home keeps moisture away.


Condensation forms when warm humid air meets cooler surfaces like windows and walls. It’s exacerbated by limited ventilation and airflow in the home. Controlling indoor humidity through venting showers, using exhaust fans, and avoiding drying clothes indoors are key. Also allow air circulation around furniture against walls. Installing insulation helps keep surface temperatures stable. Dehumidifiers remove moisture from the air in damp rooms.

Leaking Appliances

Appliances like dishwashers, washing machines and refrigerators can leak and create dampness. Install these appliances on waterproof trays to catch leaks and avoid water damage. Inspect hoses and seals periodically for cracks requiring replacement. Know where your home’s shut off valve is to stop water flow if an appliance does start leaking. Repair leaks as soon as detected.

Cracks in Concrete Slab

Cracks in concrete slab foundations allow ground moisture to rise through the opening. Epoxy injection is the most effective DIY repair for sealing foundation cracks. Alternatively, engage a contractor to drill into the slab and install a urethane seal deep inside the crack. They can also assess the underlying cause like soil movement and recommend solutions.

Penetrating Damp

This occurs when moisture penetrates the exterior walls of a home. Common causes are damaged or missing grout around windows, doors and other wall openings. Look for deteriorated pointing, cracked or broken wall cladding like brickwork allowing water intrusion. Re-pointing grout, sealing gaps and repairs to exterior wall surfaces blocks moisture from entering internally.

With vigilance and prompt repairs to correct any moisture sources, you can remedy unwanted dampness issues in your home. Addressing root causes, improving ventilation and applying waterproofing treatments will help keep your house dry and comfortable. If moisture problems persist, consulting a building inspector or contractor is recommended to inspect for hidden leaks and advise the necessary repairs. Acting quickly to fix moisture in a home prevents further damage and expensive rectification work.