Damp Proofing and Rising Damp

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Watertight Homes have been offering damp proofing services for many years. We are experts int he field and can offer our services to those suffering from rising damp. The most effective way for you to treat rising damp is by injecting a cream based silicone into the wall.

The benefits are:

• Little or no odour

• Safe to use

• No expensive equipment required

• Maximum results

• Used by professionals

• BBA approved

• Easy to install

The cream is injected into holes by a cartridge gun or professional applicator rising damp is one of the most common problems in older properties caused by ground water rising through the mortar beds of brick or stonework when there is no damp proof course or a defective damp proof course

The signs of rising damp can include:

• A tidemark or staining of walls above the skirting boards to three foot high

• Salt on wall

• Plasterwork or paint falling off

• Damp patches that come and go

• A cold or damp wall

The height to which the water will rise depends on the construction of the property but is normally about one meter high. Ground water contains soluble salts that are left behind when the water evaporates on the affected wall and over time cause considerable damage to the surface. Ground water salts are hygroscopic (they absorb moisture) so even if you control the rising damp at the source the salts alone can cause the wall to stay damp.

Step 1 - Survey

The first step in damp proofing is to survey your property and list any faults to eliminate any other sources of water ingress it will help to write down your results for the next stage.

External observation

• Chimney

• Rainwater goods

• Cracks in walls

• Window and door seals

• High ground level

• Bridged over existing D.P.C.

• Air vents

• Height of floors next door

Internal Observation

• Rot at skirting boards

• Wooden ground floor rot

• Salt on walls

• Mould growth

• Signs of damp on all walls

If your property has a cavity wall always ensure that the cavity is clear.

Step 2 – Meter Readings

Take meter readings of the affected ground floor walls if you have a damp meter. If you do not have a damp meter you could use the back of your hand to see if the area is more damp at the top or bottom of wall.

A moisture meter can be useful in establishing if you have rising damp but cannot give absolute proof due to contamination of some walls. If readings are higher at bottom of wall and cut off about 1 meter high you have rising damp. If readings are higher at the top of wall you have penetrating damp or condensation. If readings are low top and bottom and concentrated on middle of wall 1 meter up you have either contaminated plaster work or a failed treatment carried out before. If wall is damp for only 100mm above a solid floor it may be a defective DPC to DPM joint

Step 3 - Preparation for Treatment

• Lower ground levels if required

• Check for any bridging of the damp proof course line

• Remove skirtings, do not reuse skirting if rot is present

• Remove affected internal plaster work to a minimum of 1 meter high or 300mm above affected plaster work

• Remove all timber fixings

• Rake out mortar joints

• Brush and clean area

• Ensure area is protected from accidental spillage

• Read all safety information and installation material

• If you have a party wall, explain to your neighbours why and when you are doing the work

• Always wear the appropriate safety equipment (PPE)

Drying Times & Guide For Treatment of Rising Damp Read More