Waterproofing Roofing

DIY Guide: Waterproofing Roofing

DIY Guide: Waterproofing Roofing

Waterproofing Roofing DIY Guide

A step-by-step DIY guide to waterproofing roofing

STEP 1: Make sure the roof/wall surface is clean and dry and loose or flaking paint is removed.

STEP 2: Apply an unthinned coat of Plascon Roofseal or Plascon Gelseal to the roof surface to be waterproofed.

STEP 3: Immediately embed Plascon Waterproofing Membrane into the wet coat of the Plascon Roofseal or Plascon Gelseal.

STEP 4: Immediately apply another coat of Plascon Roofseal or Plascon Gelseal over the embedded membrane.

STEP 5: Allow 48 hours to dry and, if required, finish with a coat of Plascon Nuroof Cool (TRP Range).

Click on the Plascon Products below for more info!

Waterproofing Roofing Products Used

24 thoughts on “Waterproofing Roofing

  1. A contractor is currently painting our townhouse complex’s roofs (32 of them) with Plascon Rainforest green. According to his quote the contractor is suppose to paint two coats on each roof, but it does not look like his workers are doing that. I discussed my concerns with the contractor, but he claims that they are putting on two coats. Is there any way of ‘measuring’ the thicness of the paint to ensure that two coats were painted ?

    • Hi Willie, if you can provide us with the total square metre area of the roofs, we can calculate how much paint is required for 2 coats and then be able to tell from the quantity of paint bought or used by the contractor if it is enough for 2 coats. We might also need to know if any of the roofs have a pitch, and if it’s a high, normal or low pitch.

      Alternatively, you could use the Plascon Paint Calculator to try work this out for yourself.

    • Hi Louis, thanks for getting in touch.

      Unfortunately we do not have a specification for flat roofs, because water tends to settle on the surface causing the coating to peel off.

  2. Hi. I need to waterproof my roof which is asbestos and T-shaped. Cannot afford expert so will be going the diy route. Some guidance on products and best process will be appreciated.

    • Hi Regan, thank you for contacting us.

      Kindly note that we have recently had discussions with the Western Cape Asbestos Authority (021) 946 3368/082 305 2000 – Graham; (graham@ingozi.co.za) about specifying and painting asbestos roofs. You can also contact Mr. James Hani (021 441 8155) at the Western Cape Provincial Office of the Department of Labour about working with asbestos.

      It has been brought to our attention that we are no longer allowed to specify for the preparation and painting of asbestos. All work being done on asbestos will be classed as “demolition work”, according to Graham.The problem with hydroblasting asbestos isn’t just the wet fibers being sprayed into the air; it is the fibers that are wind-borne when they dried out and this gets breathed in by humans and animals.

  3. Good Day,

    I need to waterproof and paint my tiled roof and would like some advice. I know I need to first clean the roof to make it ready for painting. How do I go about the process? From what I have read here I need to use this waterproofing membrane but does that mean I need to cover the entire roof with a membrane? Can I not just seal the gaps with a sealant and then paint with the roof paint?

    • Hi Alan, here’s what you need to do.

      Ensure that surfaces are dry, free from dirt, grease and oil and loose and flaking paint. Remove any fungi and algae with household bleach (3.5 % sodium hypochlorite solution) and rinse thoroughly with water.

      For Waterproofing and crack sealing with Membrane: For porous surfaces thin first the coat 1:1 with water to aid penetration and adhesion. Allow to dry for 2 hours.

      To all primed and sealed surfaces apply a full coat of Plascon Roofseal unthinned at approximately 2 m²/?. Immediately embed the polyester membrane into the wet coating – ensuring that the membrane is thoroughly saturated by the coating. Before this coat is completely dry apply a further coat of Plascon Roofseal to completely cover the membrane. Allow to dry and finish with a final coat of Roofseal.

  4. Hi, my dwelling has a flat concrete roof which has a “Torchon” malthoid type seal. We us a Silver/bituman paint to seal it. The roof leaks and causes the paint on the inside wall to blister. We have also been told to use a White paint on the roof to reduce the heat. Do you manufacture a bituman based white paint? I also understand that Silver paint gives better protection against the UV rays, Is this true?

  5. Please export this product to Australia. Nothing equivalent is available. The nearest equivalent is not as good or as easy to apply and costs R1600.00

    • Hi Sir / Madam, currently our products are available right across Africa, but unfortunately are not available in Australia. We apologize for the inconvenience and thank you for the interest in our products.

  6. Hi! I do construction for the community and I just wanted to find out if you have a training program on how to repair a leaking roof and whether there is a rubber product that can be used?

    • Hi Mpfariseni, thank you for contacting us. Please note that Plascon does not produce rubber products. We can however advise using Plascon Roofseal or Plascon Gelseal for waterproofing roofing. Please find the technical data sheets in the links provided which contain more information than what’s provided in the article above.

  7. Hi, I have some questions so I will number them so nothing is left out.

    1. I want to waterproof a concrete roof of around 350 square meters. How many litres of Roofseal do I need to buy and how much membrane is needed too?

    2. I read the Roofseal datasheet and it said that the first coating on pourous surfaces has to be thinned with water at 1:1 and now I’m confused because it’s not mentioned here. Do I need to do this first coating at 1:1 water?

    3. Do I have to put the membrane in the whole roof or is it only needed in cracks?

    4. how many coatings are needed and what are the spreading rates and thinnings for each?

    • Hi Abel, thank you for your queries. Please see below:

      1. The practical spreading rate will vary depending on the porosity and profile of the substrate as well as the application technique and tools used. It also depends on how many coats of paint and what membrane you are going to use.

      2. Yes – for Waterproofing and crack sealing with Membrane: For porous surfaces thin first coat 1:1 with water to aid penetration and adhesion. Allow to dry for 2 hours.

      3. Only on the crack surfaces.

      4. To all primed and sealed surfaces apply a full coat of Plascon Roofseal – unthinned at approximately 2 m²/?. Immediately embed the polyester membrane into the wet coating ensuring that the membrane is thoroughly saturated by the coating. Before this coat is completely dry apply a further coat of Roofseal to completely cover the membrane. Allow to dry and finish with a final coat of Roofseal.

  8. Hi. I have a product, SAT 537, BODYGUARD Dusty Grey (RAL 7037). Can I use this product to coat a roof covered with Cement Fibre Sheets? Is this a rubberizing to seal this type of roof?

    • Hi Sam. The product you are referring to is from our Industrial range and is manufactured for Transnet. Please kindly contact Frank Bezuidenhout 083 628 3450. He will assist you with information on this product.

  9. Hi, I have a product called Painter Choice Fibre Bond for the tiles of the roof. Is this applied by brush, roller or spray please? Do I coat the whole roof with this before I paint?

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