Feb 27, 2019

Prepared by Tracy Greenwood for NewMedia

waterproofing home and roof

Waterproofing is one of the keys to the success of any renovation, and the experts at Plascon have all your waterproofing questions covered.

Donovan Bezuidenhout (Training Practitioner / QA & Development SA, East Africa and Nigeria at Plascon) answers the following commonly asked waterproofing questions:

I am thinking of doing my own waterproofing at home. Do you think this is wise or should I call in the help of a professional?

Waterproofing tasks are often intricate and involve careful preparation and application. It also depends on the area to be waterproofed and the type of product used. Most waterproofing products are easy to use but DIY enthusiasts and homeowners need to follow application instructions. The number one thing to do first is to locate the source of the rising or penetrating damp, leaks or poor drainage systems.

How do I waterproof my new shower before laying the tiles?

There is a range of products that can be used; most are bitumen-based, which are effective. Other products can be added to tile cement to waterproof. There are also products available to seal tiles and grout as well.

There is what seems to be rising damp coming through our lounge wall. The paint has blistered and looks almost mouldy. The wall in question backs onto a flowerbed in our front garden. What can I do to solve this problem?

This is a common problem and the exterior needs to be waterproofed first as water from the flowerbed penetrates through the wall to the interior surface. This is often the case if there is no visible plinth or weeping holes. Plascon Wallseal can be used to waterproof exterior. On the interior scrape all chalked, loose or flaking paint from the surface. Sand lightly and remove dust with a damp cloth. Apply Plascon Dampseal.

How do I go about waterproofing my roof?

Waterproofing a roof will require ladders and safety equipment and is often best done by a professional. Plascon offers a range of waterproofing products for both contractor and DIY enthusiasts.

Although this is dependent on the type of roof, and the type of problem, Plascon Dampseal can be used. To use the product make sure the surface is slightly damp but not too wet. Remove all loose paint completely – the surface should be taken back to the bare substrate by sanding or scraping, or you could use Plascon RemovAll All Purpose Paint Remover (RRA 220). Use a Polycell sugar soap solution and bristle brush remove all loose and friable material. Re-plaster with cement plaster if necessary. Remove any grease with Aquasolv Degreaser (GR 1).

What are the causes of leaking roofs?

Causes of leaks include broken tiles, ineffective flashings, overlaps between the roof sheets and weathered surfaces around roof nails.

We have just built a face brick braai outside and it needs to be waterproofed. Is there a Plascon product I can use for this purpose?

Plascon has various sealers for bricks but they're not heat-resistant, so they’re not really suitable for a braai.

Our new home has what looks like a fibreboard shed in the back garden. How do we waterproof and paint it to make it last?

First clean all contaminants and allow to dry. Then apply Plascon Plaster Primer and two coats of Plascon Wallseal