If your flat roof has been waterproofed twice in five years and is still leaking, the system is wrong. Torch-on bitumen membrane is the only long-term answer for flat roofs that hold water. We apply it across Gauteng, from flat-roof homes near Sandton City to commercial buildings along the Centurion N1 corridor. Call 081 016 3479 for a free assessment.

When You Need Torch On Waterproofing

Torch-on waterproofing is specified when a flat or near-flat concrete roof has a history of repeated leaks, when the existing coating has failed and needs full replacement, when ponding water occurs after rain, and when hydrostatic pressure is high enough to push through thinner or less bonded coating systems. If you’ve had your flat roof “waterproofed” twice in five years and it’s still leaking, it’s time for a proper torch-on system.

Our Torch On Waterproofing Process

The existing failed membrane or screed coating is completely stripped to the concrete. The substrate is primed with a bitumen primer to improve adhesion. APP or SBS modified bitumen membrane, typically 3.5-4mm thick, is heat-welded to the primed surface using a propane torch, melting the underside of the membrane as it unrolls to create a fully bonded lap. All laps between rolls are overlapped and fully sealed. Upstands at parapet walls are turned up 300mm minimum and capped. The finished result is a single, seamless waterproof membrane with no weak points.

Cost of Torch On Waterproofing in Gauteng

Torch-on waterproofing cost in Gauteng depends on the roof area, existing screed condition, amount of stripping required, and access. We provide free on-site assessments and detailed written quotations. No hidden charges.

Why Choose Logiline for Torch On Waterproofing

Licensed specialists. Fully insured. Workmanship Warranty on all torch-on work. Torch-on membrane is one of the most durable flat roof systems available when applied correctly, we apply it correctly, every time. We serve all of Gauteng.

Common Questions

How long does torch-on waterproofing last?

A correctly applied torch-on bitumen membrane lasts 15-20 years. The substrate must be properly primed and all laps fully sealed. Shortcuts in either area cause early failure.

Can torch-on waterproofing be applied in winter?

Yes, with precautions. Cold surfaces require additional heat and priming time. We do not apply torch-on in rain or when frost is expected overnight, as moisture in the substrate affects adhesion.

Is torch-on waterproofing suitable for all flat roofs?

Torch-on is ideal for concrete flat roofs. For timber-based flat roofs, we assess the deck condition first, some decks need structural repair or overlay boarding before torch-on application is appropriate.

Flat roof leaking repeatedly? Stop patching it. Call 081 016 3479 for a free torch-on assessment.

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Further reading: waterproofing, building waterproofing materials and techniques.

Torch On Waterproofing in Gauteng, Fully Bonded, Fully Sealed Flat Roofs