Plastering damp walls

Replastering Damp Walls

One of the most common parts of the damp proofing process that is usually overlooked is the replastering of damp walls. The installing of a new damp proof course is one of the best practices for protecting against rising damp.

Even though treatments in place will stop the process of moisture rising up the walls, the damp proof course will not be able to get rid of existing moisture and salts, already deposited from years of the property suffering from rising damp.

This would mean that a damp proofing contractor will need to accurately assess what sections of the salt contaminated plaster will need to be removed.

Accredited to

Nic Glover

Branch Manager and Waterproofing Design Specialist CSRT CSSW
North East

What Plaster Will Need Replaced?

It is a big decision deciding what plaster will need to be replaced and having a professional who has expert knowledge of damp proofing is essential for the process to run smoothly. Areas of plaster that are highly contaminated with salts are easily visible to the naked eye and will need replacing.

Damp stains on an interior wall

However, there are parts of the plaster that are moderately salt contaminated will be much more difficult to identify and could cause future damp problems if left untreated. There are also other considerations that you should bear in mind as well. These are:

  • How effective the Damp Proof Course is?

If the damp proof cream used is highly effective, then it is more likely to result in fewer salts left on the walls. This would mean more of the original plastering could be retained.

Technician applying a damp proof course

  • What type of plastering is being used?

When assessing what replastering should be taken place the technician will examine what pre-existing plaster is already on the walls. For example, Carlite is a standard plaster and will not prevent the plaster from being salt contaminated.

  • What type of Building has been affected?

The type of building is a factor in what type of plastering needs to be carried out. For example, on heritage properties, there is usually a desire to keep the original plaster which will lead to less replastering needing to be carried out.

Leaving the original plaster will though carry the risk of further problems from salt damage to the walls. In rental properties, more widespread replastering will more than likely be carried out as this will allow the building to be available to be marketed to potential tenants with fewer delays.

What are the Replastering Choices?

There are two choices that will be made by the surveyor on what replastering should be carried out and these are traditional render or modern membranes.

Traditional Render- Sand and cement will be applied to repair any holes and joints. This particular method is not usually favored by many damp proofing companies due to the many disadvantages it has compared to using a damp proof membrane.

The only real advantage is that it is less inexpensive to use compared to membranes. The problem with traditional render though is that it is slow to dry and the walls will remain cold.

Plastic Lining Membrane- Damp proofing membrane, as it is also known as, is a plastic sheet on a roll is applied onto the floor or wall which provides protection against any future potential damp problems. One of the main advantages of using a membrane is that there is no real drying time.

The installation process is relatively simple for the technician to implement. Compared to the traditional render, the surface will remain warm so it will also be less prone to condensation problems.

Contacting a Specialist in Replastering Walls

If you concerned that your property is suffering from damp walls and need some specialist advice on which replastering method should be carried out, then do not hesitate to contact Timberwise.

We have a number of specialists who have treated properties across the UK suffering from damp problems. Simply contact us online or call 0800 288 8660.