York - Rentokil Property Care

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Penetrating Damp Treatment in York

Peter Cox were called in to survey a property with suspected damp problems in the centre of York.

An external check carried out as part of the property survey allowed the surveyor to spot the high ground levels to one side of the house. This means the ground outside the property wall on one side was significantly higher in comparison with the internal floor of the property. A lateral external wall abutting the area with the damp issue was also noted, with these issues a potential source of moisture running into the property.

Pentrating damp in a York Property

Inside there were visible signs of dampness indicating an issue due to lateral penetrating damp from the high external ground levels. The water in the high ground is able to enter the building as the masonry is porous, which can lead to areas of plaster to deteriorate and crumble off the wall, which was noted inside. Furthermore there were also patches of damp evident from where the adjoining external wall connected to the property, meaning moisture from outside was able to bridge through the wall into the property.

These defects allow moisture to be transmitted into the building fabric. Not only is this likely to spoil and damage internal finishes and decorations, but it will also put timbers within the property at risk from issues such as wet and dry rot which can damage the building fabric itself.

Additional Condensation Problems

Due to excess moisture in this section of the property, condensation was also noticed on the surfaces of some internal walls as well. Condensation is caused when water vapour comes in contact with cold surfaces and condenses to form dampness or water droplets.

wall and pentrating damp

Images showing external wall abutting the property and damaged plaster due to water ingress from high ground levels on the other side of the wall

Recommendations & penetrating damp treatment

Qualified surveyor Lloyd Jones who surveyed the property said “This is a common issue for properties across York where there are high ground levels, the best way to prevent this problem is by using membranes on the areas affected by penetrating damp, creating a waterproof barrier between the external moisture and the internal walls”

Peter Cox trained and qualified technicians hacked off the affected plaster, clearing away the debris before installing a waterproof membrane to the walls. This is then plaster boarded and skimmed to match in with the room. This can then be redecorated. This work is covered by a 20 year guarantee, protecting you against the recurrence of dampness in the treated area.

York wall membrane

Waterproof membrane was installed to create a barrier between the external moisture and the new internal plaster.

Solution for the condensation problem - anti-condensation paint

When warm air comes into contact with a cool surface, the temperature drops and can't retain the same amount of water vapour. This excess water vapour is released in the form of condensation. Water vapour is invisible in the air and is created by everyday activities such as boiling kettles, cooking, drying clothes, pets, the use of non-flued heating and even breathing.

Air within the home becomes saturated with water vapour and when there is a lack of ventilation from air bricks, extractor fans or open windows condensation can form, especially on cold surfaces such as north-facing walls.

Due to condensation located on the cold wall surfaces, an anti condensation coating was used to create a thermos-like barrier between the cold surface and the ambient temperature of the living space. As the air is insulated the condensation is controlled and in turn will not form on the colder surface preventing mould growth.

One of the most cost effective ways to save heat is to stop it escaping in the first place. Surfaces that have been coated with Warmerwall will help reduce heat loss due to the coatings ability to block heat transfer from the room into the cold surface.

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