The most common reason waterproofing fails fast is that new product was applied over old, failed product. The new membrane bonds to the old one, not the substrate, and within one or two Gauteng summer seasons it separates and leaks again. We strip failed waterproofing before applying anything new, whether you’re in a flat-roof apartment near Johannesburg’s Carlton Centre or a 1980s home in Randburg. Call 081 016 3479.

When You Need Remove Old Waterproofing

Old waterproofing removal is needed when an existing membrane is delaminating, blistered, cracked, or failed, and a new waterproofing system is being specified. Applying a new waterproofing product over a failed membrane that has lost bond to the substrate means the new system has nothing solid to adhere to. It will fail as fast or faster than the old one. This is one of the most common mistakes in waterproofing, and one of the most preventable.

Our Remove Old Waterproofing Process

We mechanically or chemically strip the existing failed membrane from the substrate. For bitumen membranes, this involves heat-softening and scraping. For acrylic or cementitious coatings, we use grinders or scarifiers. The exposed substrate is then inspected for cracks, spalling, or contamination that could affect adhesion of the new system. Cracks are filled, high spots are ground down, and the surface is cleaned and primed appropriately for the specified replacement system.

Cost of Remove Old Waterproofing in Gauteng

Stripping cost depends on the type and thickness of the existing membrane, roof area, and access. It is usually included in the full waterproofing quotation. Free on-site assessment and written quote.

Why Choose Logiline for Remove Old Waterproofing

Licensed and insured. We won’t coat over a failed membrane because it’s faster. We strip and prepare properly so the replacement lasts. Serving all of Gauteng.

Common Questions

Why can’t you just apply new waterproofing over old?

New waterproofing over a failed membrane bonds to the old product, not to the substrate. When the old membrane continues to delaminate and blister, the new product goes with it. The fix must reach bare concrete.

How is old bitumen membrane removed?

We heat the membrane with a torch to soften the bitumen and scrape it off the substrate. On large areas, mechanical scrapers may be used. After stripping, the substrate is cleaned and any remaining adhesive residue is addressed before priming.

Is old waterproofing removal included in the price?

We include stripping in the waterproofing quotation and specify it clearly. The cost depends on the area, the thickness of the existing membrane, and access difficulty. There are no hidden charges, you see the full scope in the written quotation.

Failed waterproofing that needs to be stripped before replacement? Call 081 016 3479 for a free assessment.

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Further reading: waterproofing, building waterproofing materials and techniques.

Remove Old & Failed Waterproofing in Gauteng, Get the Substrate Right Before You Start