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Why are plaster houses built between 1990 and 2004 considered at risk to being leaky?

Roof design

Here the water is controlled by the roof and runs off away from the walls. The walls are not acting as the main defence against all that water discharging. The walls only get a little damp and not flooded with water.

The roof in this photo is complicated with lots of junctions where water may get in.

Very Good
Risky
Joints in walls

Weatherboards overlap each other and water runs over the face of the boards and has nowhere to become trapped.

The plaster waterproof coatings stop at the window and gaps and cracks form where water gets in.

Very good
Risky
Ground dampness

The floor and walls in this example are well away from the ground and can quickly dry.

The floor is nearly at ground level and dampness builds up within the walls.

Very good
Risky

How we assess the risks and check for dampness and damage.

Inspect the exterior and look for risky roof designs, wall junctions and ground dampness such as those pictured above.

Carry out moisture scanning to the walls inside at-risk areas.

We may be requested to find out how much leaking or damage there is, so we use “invasive” testing methods using moisture probes, which are taken by drilling small holes.

High reading to the wall below the risk area
The probes and moisture meter measure the moisture levels in the timber (i.e., the moisture content %)

When wet walls are found, we may cut it carefully open to determine if the framing needs replacing

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