Commercial Roof Slab Waterproofing in Menlo Park, Pretoria

Location: Menlo Park, Pretoria
Service: Concrete roof slab waterproofing — ArmTec HyperFlex over existing torch-on (commercial office)

A commercial office building in Menlo Park, Pretoria had a flat concrete roof slab where the original torch-on waterproofing had failed. With offices in use underneath, the owner needed a durable, seamless overlay that could go straight over the old membrane without a full strip-out, so Eco Seal installed the ArmTec HyperFlex system over the prepared torch-on.

The problem

The existing torch-on membrane had blistered, cracked and lifted at the laps, with the upstands and outlets no longer sealed. Bituminous torch-on hardens and turns brittle under Highveld UV, so once the laps open, water tracks under the sheet and into the offices below. Ripping torch-on off an occupied office roof is disruptive, so a bonded liquid overlay was the correct, low-disruption fix.

The Eco Seal solution

As an approved SealPro applicator, Eco Seal overlaid the failing torch-on with a fully reinforced ArmTec HyperFlex membrane:

1. Clean and prepare — the torch-on was cleaned down, blisters cut and laid flat, and lifted laps, upstands and outlets made good.
2. Prime — the surface was primed with Penetrar to bond the new system to the aged bitumen membrane.
3. Detail the weak points — laps, movement joints, upstands and pipe penetrations were reinforced with Flex and StretchSeal.
4. ArmTec HyperFlex membrane — HyperFlex was applied with ArmTec reinforcing mesh embedded across the full slab, forming one seamless, elastic sheet over the old torch-on.
5. Protective topcoat — finished with two coats of HydroSeal HF for a UV-stable, heat-reflective seal.

The result

The office slab now carries a single, seamless waterproof membrane bonded over the old torch-on, with every lap, upstand and outlet reinforced and sealed — the same concrete slab waterproofing and ArmTec HyperFlex system we install on commercial roofs across Pretoria. Minimal disruption to the offices below and a finish built for the Highveld. See more of our waterproofing work.

Contact Eco Seal for a free inspection and quote: 083 309 8164 · www.ecoseal.co.za

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