Curing Rising Damp

Curing Rising Damp DIY Guide

DIY Guide: Curing Rising Damp

Curing Rising Damp DIY

A step-by-step DIY guide for curing rising damp

STEP 1: Remove any paint completely back to a cement/plaster surface.

STEP 2: Wash with Polycell Sugar Soap, rinse and allow to dry.

STEP 3: Remove and repair poor plaster with Polycell Masonry Patching Plaster.

STEP 4: Apply 3 coats of Plascon Dampseal, allowing 24 hours drying time between applications. Thin the first coat 30% with Mineral Turpentine.

STEP 5: I f required, skim the wall with Terraco EZ Skim (TER 1100 OR TER 1200) for a perfectly smooth surface.

STEP 6: Finish with your chosen Plascon topcoat, such as Double Velvet, Cashmere or Polvin.

Click on the Plascon Products below for more info!

Curing Rising Damp Products Used

27 thoughts on “Curing Rising Damp

  1. I stripped an exterior wall of most of the paint as the paint was pealing. I then applied a coat of plaster primer. However, I now realise I need to apply Dampseal as this seems to be the cause of my problem. Can I apply the Dampseal over the primer?

    With the rest of the exterior walls I also see a lot of pealing at the bottom but cannot decide whether this is damp or just the fact that I have left it for more than 12 years. I am considering applying Dampseal rather than primer to cover both possibilities. Is this a reccommendable approach? It does appear as though the Dampseal does also provide the benefits the primer does with the added benefit of sealing off moisture.

    • Hi Leslie, we have some more advice from our technical team. Please see below:

      Plascon Dampseal can only be applied to the bare concrete. We would advise that you treat all the walls where the problem is occurring as it might be damp, especially on the bottom parts.

      The full product data sheet – with full application details and cautions – can be accessed here.

      The areas that were already treated with Plaster Primer cannot be treated with Dampseal as the Plaster Primer penetrates into the wall, this will prevent the Dampseal to penetrate and seal the surface.

    • I am busy fixing a very old house, almost 90 years old and it has damp walls on weatherside, rooms from the skirting to the middle of room near window/ from skirting to almost ceiling height and near window. As I understand these old homes have clay walls?? Please help, what can I do in this case, the procedure and what products do I use?

      • Hi Mrs Scholz, thank you for getting in touch.

        If the walls are indeed clay, unfortunately we do not have products from the Plascon Range that are designed for clay surfaces, neither do we have a full waterproofing system. From what we can gather from your query is that you need to contact a waterproofing company / specialist that will be able to assist with a full waterproofing system. There is a company called Coprox who deal with waterproofing. They can be contacted on 011 579 4300.

  2. I’m currently preparing the exterior walls of my house. On some walls the existing paint is flaking due to bad quality undercoat with Plascon Micatex as topcoat. Please advise how to rectify. I am considering to use the Micatex again.

    thks
    Selva

    • Hi Selva, thank you for getting in touch.

      It may be possible to correct cracking that does not go down to the substrate by removing the loose or flaking paint with a scrapper or wire brush, sanding to feather the edges, priming any bare spots with Plaster Primer (UC56) allowing 16 hours drying time and repainting with 2 coats of Micatex allowing 2 hours drying time between coats. If the cracking goes down to the substrate remove all of the paint by scrapping, sanding and/or use of a heat gun; then prime with Plaster Primer and repaint with Micatex.

  3. I used Plascon Dampseal on a bedroom wall, approximately 3×2.6 metres. The smell is overpowering, 2 days later, how do we get rid of the smell?

    • Hi Neil, is there perhaps enough ventilation allowing the room to aerate? One trick you could try is placing saucers with vanilla essence on all four corners of the room.

  4. Exterior wall paint is coming off plaster and I can see the bricks. Grass connect with the wall. It is said I should use dig lower and seal it with plastic (builders damp). It I put cement take away the grass. Do I put Dampseal before plastering the wall again? thx Al

    • Hi Algernon, thank you for contacting us.

      We recommend that the Plascon Dampseal be applied on newly plastered walls that need to cure for 28 days. Exceptionally damp walls can be treated as follows:

      1. Divide the area into three equal horizontal sections. Apply a first coat thinned 3 parts PLASCON DAMPSEAL to 1 part MINERAL TURPENTINE (by volume) to the bottom section and allow 24 hours to dry.

      2. Next treat the middle section and allow 24 hours to dry.

      3. Finally treat the upper section and again allow 24 hours to dry.

      4. Apply a second coat (unthinned) to the entire area.

      NOTE: Coating may be smoothed over with a trowel wetted with MINERAL TURPENTINE to match up to a smooth wall surface.

      In severe cases of water coming out from the walls you will have to contact a waterproofing specialist as we do not have a full waterproofing system. There is a good waterproofing company called Coprox who can be contacted on 011 579 4300.

  5. Damp seems to be rising through the plaster and the wall had been skimmed already. Can I still use the Dampseal over the skim? Also, what if I remove all the plaster back to the exposed brick, then what can I use to seal the brick?

    • Hi Cisco, thank you for your query. Here’s what you need to do:

      1. Ensure that the surfaces are clean and sound before painting. Surfaces may be slightly damp but not wet.

      2. Remove any paint completely back to the bare substrate (plaster).

      3. Remove loose and friable material to achieve a sound surface.

      4. Re-plaster with cement plaster if necessary.

      5. Remove any oil and grease with POLYCELL SUGAR SOAP. Rinse thoroughly and apply 3 coats of Plascon Dampseal, allowing 24 hours drying time between coats,

      6. Only thin the first coat 3 parts PLASCON DAMPSEAL to 1 part MINERAL TURPENTINE by volume.

      7. PLASCON DAMPSEAL may be overcoated with a good quality emulsion or enamel paint. If overcoating with an enamel, first prime with PLASCON PLASTER PRIMER.

  6. Hi all, I bought a house that has a garage with severe dampness on the walls. Garage was built against a sand bank and I don’t think that the plastic was used. I have now purchased Dampseal. Please advise on how to eliminate this dampness with Dampseal. Thank you

    • Hi Sheldon, thanks for getting in touch.

      Kindly note that Plascon Dampseal is for treating the effects of rising and penetrating damp. If you are experiencing excessive damp problems you will need to get hold of a waterproofing company as we do not have a full waterproofing solution or system from the Plascon Range. One can get in contact with a company called Coprox on 011 579 4300 for a full waterproofing solution.

  7. Thank you for your informative posts. As regards effectively using Dampseal (as thoroughy directed in your literature) :

    If I have already stripped the damp-affected area to the bare brick, do you recommend first treating the bare brick with dampseal in the 4 phase process, plastering and then treating the new plaster with dampseal again, before rhinoliting and painting? Or is this overkill?

    How long do you advise waiting before rhinoliting and painting plaster which has been treated with Dampseal?

    Thanks in advance

    • Hi Carlos, thank you for bringing your queries forward to us.

      Kindly note that Dampseal can only be applied over plaster, not on bare bricks. One cannot plaster over Dampseal as it won’t be able to take the weight of plaster.

      Plascon Dampseal is specifically used to treat the effects of rising and penetrating damp. However, if you are experiencing excessive damp problems you will need to get hold of a waterproofing company as we do not have a full waterproofing solution or system from the Plascon Range. One can get in contact with a company called Coprox on 011 579 4300 for a full waterproofing solution.

      Regarding new plaster, this has to be left to dry for 28 days at least. Please verify with the manufactures of rhinolite as to how long you need to leave it to dry and if you are able to apply rhinolite in an area where there are damp problems as rhinolite is very sensitive to moisture.

  8. Hi Plascon team, we are moving into a home that has damp on all the walls inside and out. The folks that were there previously had not painted or maintained the home in about 15 years. Where do I start? My thought is first clean and seal outside, then doing the inside. Do I have to put fans and heaters on the inside, and how will I know that there is no moisture trapped within the walls? Kind regards, Mike

    • Hi Mike, thanks for getting in touch. Your first step would be to address the source of the damp and (as you say) ensure that there is no moisture within the walls. Unfortunately Plascon does not offering a full waterproofing system, however we can recommend a company called Coprox who can be contacted on 011 579 4300. Thereafter, you may apply Dampseal.

      Here is an article with more info: Curing Damp Walls with Plascon Dampseal

  9. Good day, I have recently renovated a old house in Kensington area. Damp is coming from the outsides and causing the wall paper to bubble and rot. The soil is clay and the is lawn right around the house? Would you recommend a damp expert… please help?

    • Hi Eluan, yes, a damp expert is recommended as it is important to first address the source of the damp, otherwise you may experience similar issues down the line. We recommend a company called Coprox who offer a full waterproofing solution. They can be contacted on 011 579 4300.

  10. Hi there, at my complex we are needing to repaint our boundary wall which has many cracks, and damp, there is consideration of using Cemcrete but I tend to think it is better to strip seal and use Micatex. What is the general opinion?

    • Hi Charmaine, thanks for getting in touch. Here’s what you need to do:

      Remove all paint to bare plaster by scraping and or grinding. Repair plaster defects with Polycell Masonary Patching Plaster. Brush with 3 coats of Plascon Dampseal, thinning the 1st coat 30% with mineral turpentine. Allow overnight drying between coats. Finish with chosen Plascon top coat.

  11. My garage had rising damp and so I scraped off loose paint and plaster then had it rhinolited to cover ugly patches. Can I use your Dampseal Paint as a first coat over rhinolite?

    • Hi Rowen, thank you for your query. Please note that you can not use Plascon Dampseal over rhinolite. You will need to remove the rhinolite and then re-plaster with Polyfilla Masonary Patching plaster. Thereafter you can apply Plascon Dampseal.

  12. I have a rising damp problem in my boundary wall to the extent that both the paint and plaster have peeled off. There is no damp course lining between the foundation/ground level and the brick work. Can you please help? Thanks. Willem

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