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Knowing the Cost of Damp-Proofing House Walls

This article will provide you real facts and helpful information about damp-proofing house walls, including the cost of labor and turnaround time of this home improvement project.

Dampness can occur in any house and that is one of the last things homeowners like you would want to face at home. When damp starts to infiltrate the foundation of your house, it disintegrates and can be absorbed through walls or floors into the interior of your entire property. It causes the growth of mold and mite infestation that could lead to structural damage.

But the most alarming thing is the risk of your family to various types of illnesses. If you care about them, make sure that your home is the first safest place to be. Free it from any sort of excess moisture. It is very important to identify and tackle damp as soon as possible.

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Basic Knowledge: What is Damp-Proofing?

Damp-proofing is a general term for various methods and techniques for treating damp problems. It is a moisture control application in all types of building walls and floors. It targets to prevent moisture from passing into the interior spaces. A building without any damp-proofing technique applied is prone to rising damp, dry and wet rot.

Normally, when a property is being constructed, a preventive damp-proof course (DPC) is built into the walls just above ground level. When professionals do the damp-proofing job, the standard procedures are as follows:

  •         Full wall inspection.
  •         Check-up of the existing damp course.
  •         Removal of 1.5m high skirting boards and plaster internally.
  •         Waterproof liquid injection.
  •         Waterproof render will be applied to the internal wall.
  •         Damp-proofing finishes with plaster.

Project Cost

A damp-proof course average cost is around £280 to £2000. The size of your walls at home and the extent of the damage are the two most common factors that affect the price of the project. For example, the cost to damp proof an entire 3 bedroom semi-detached house is around £4200. That already includes the materials like the new DPC inserted into both internal and external walls, plus the labor cost, the rendering and plastering of all internal walls to complete and finish the project.

Other Types of Damp-Proofing Work

  1. Building a drainage channel around one side of the building. The purpose is to channel away rainwater from the walls. That would not compromise the existing DPC for long-lasting effect. In this method, the drainage channel is filled with stones and connected to the existing soak-away and rainwater downpipe. Typically, the drainage channel project costs around £1,000.
  2. Application of damp proof paint. The process involves painting the damp-proof paint onto the substrate and then covered with plaster. This special type of paint can also be applied to the plaster to lock in the moisture. This will avoid the forming and spreading of damp. The painting procedure can be a DIY damp-proofing job. The cost of the paint is usually around £6 per liter.

More Damp-Proofing Options

Now, when damp-proofing concrete, brick and masonry walls, the application of tanking slurry is advised. It is a waterproof coating made up of cement which acts as a damp-proof barrier. Tanking slurries are usually used in basements. They work well above the ground. It costs around £30 to £40 per square meter. A professional application is needed for this job.

Re-plastering your interior walls is another popular option. This method uses waterproof-based plaster. Typically the project costs around £300 per room. When it comes to your exterior walls, you will need them to be re-rendered. Price ranges from £40 to £60 per square meter. A new layer of render will be applied which includes the primer and trims.

Thinking of getting this work done? It would be best to check the condition of the interior plaster and redecoration of your walls. You need to check to see if you need to plaster the entire walls. If so, that would be a good time to re-decorate and paint your walls and skirting boards.

Protect Your House from Damp

If possible, it is best if you move out of your house for a couple of days if your property is under a damp-proofing project. Due to the plaster and skirting boards needed to be removed, this project can be very messy. Damp can quickly rot timber floor joists and skirting boards. Never ignore this fact as it can give you bigger problems and more costly repair expenses in the future.

With regard to the final estimated cost of the job, you need to consider painting or wallpapering the job after the damp-proofing. That showcases the wonderful output of the home improvement project.

It is always best to be cautious! Call in an expert now to do the job!