Damp in our houses can cause all sorts of problems from unsightly stains, Black toxic mold to wet rot and dry rot that can affect our health and the decor and structure of the property.
True Rising Dampness is caused by natural dampness in the ground, but man-made faults can increase the effect or bypass the existing damp proof course.
Identifying Rising Dampness
If Can you see a stain or ‘tide’ line above the skirting board up to a height of about 6″ – 18″ (150mm – 450mm) /then this might be signs of rising damp.Damp can rise up a wall due to several reasons.
One reason could be that the external ground level me be very close to the damp proof course or even above it. Checking exterior ground levels are at least 6 inches (150mm) below the Damp Proof Course (DPC) level would be one of the first things to check.
Plaster bridging the DPC can also be a cause. To check this remove internal skirting boards and check that the plaster does not go all the way down to a solid floor but ends above the DPC level.
The wrong plaster used.
Many remedial DPC’s are not 100% effective on there own and rely on waterproofing and salt retarder additive being used in a washed sand and cement render to the affected areas (up to 1m high in most cases).
Where plaster materials such as bonding or general plasterboard are used adjacent to the DPC this can draw moisture and contribute to signs of rising Damp.
Excessive ground water
Water leaks from pipes, drains or an ingress of water from other sources can dramatically increase the amount of moisture present in the ground. This can cause problems by exasperating minor defects in a remedial DPC and drawing salts from the ground up into the plasterwork causing rising damp and contaminated plaster and timbers.
Excessive water content in the ground can also cause evaporating under timber floors and this can condense on joists and timbers causing wet rot and dry rot requiring extensive remedial repairs.
We can help you with Rising Damp advice and effective remedies. – just call Andrew on 07831 564351
If the damp is higher up the wall or patchy, its more likely to be Penetrating Dampness – check the exterior walls for defects, check gutters and downpipes, check the pointing in the joints are not cracked or ever porous.
Typical Penetrating Damp – floating patches above the skirting.
Penetrating Dampness can be caused by poor joints in the brickwork, blocked cavity walls, holes drilled for cables or pipes, poor mastic around doors or windows, cracked or hollow external render as well as leaking gutters and downpipes.
We can help you with Penetrating Damp advice – just call Andrew on 07831 564351
Can you see any ‘black spot’ mold? Then Condensation must have formed at some time. With prolonged damp conditions Black mold or Toxic mold can begin to be seen and in severe cases thrives causing damage to decoration and causing health problems from skin rashes to respiratory symptoms requiring medical intervention.
Check ventilation and heating. To reduce condensation ensuring a good cross flow of air is present and adequate heating and insulation is essential.
We can help you with Black Toxic Mold advice – just call Andrew on 07831 564351