Roof Slab Waterproofing in Erasmuskloof, Pretoria

Location: Erasmuskloof, Pretoria
Service: Roof Slab Maintenance & Waterproofing (ArmTec System)

A flat concrete roof slab is only as good as the membrane protecting it. When that membrane ages, cracks and lifts away from the substrate, water finds every weak joint and works its way into the structure below. This Erasmuskloof property had reached exactly that point, and the owner called Eco Seal Coating Specialists in for professional concrete slab waterproofing — stripping back the failing system and reinstating a proper, seamless layer across the slab.

The problem

The existing waterproofing on the roof slab had delaminated and cracked over the years. The coating was lifting off the concrete in patches, the joints were failing and starting to separate, and staining down the parapet walls showed water was already tracking behind the membrane. Ponding in the front corner made things worse, holding water on the slab instead of letting it drain. The box gutter also needed inspection, as years of standing water take a hard toll on these details. Left as it was, the slab would keep leaking and the concrete underneath would carry on deteriorating.

The Eco Seal solution

As an approved SealPro applicator, Eco Seal installed the full ArmTec HyperFlex system to renew and reseal the 73 m² slab:

1. Preparation and priming. The old, loose coating was cut back and the substrate cleaned, then primed with Penetrar to lock down the surface and give the new system a sound base to bond to.
2. Reinforce the weak points. Cracks and delaminated joints were bridged and strengthened with StretchSeal membrane, and the outlet was opened up to correct the water flow.
3. Correct the falls. A lightweight screed was applied to the ponding front corner so water runs to the outlet instead of sitting on the slab.
4. Install the ArmTec membrane. A HyperFlex coating was applied with ArmTec reinforcing mesh embedded through it, building a continuous, fully reinforced layer across the field of the slab and turned up onto every parapet and upstand.
5. Seal and finish. The system was topped with HydroSeal HF to deliver a tough, UV-stable, fully waterproof finish over the whole slab.

The result

The slab now carries a single, seamless grey membrane with clean turn-ups onto every wall and a proper fall to the outlet. No more lifting joints, no more ponding in the corner, and no more water tracking behind a failed coating. The reinforced ArmTec system gives this roof a hard-wearing, watertight surface built to handle Pretoria’s summer downpours for years to come — the same concrete roof slab waterproofing system we install across Pretoria East.

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

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