Location: Meyerton, Gauteng
Service: Concrete Roof Slab Waterproofing (ArmTec HyperFlex System)

Flat concrete roof slabs are common on homes, blocks of flats and commercial buildings around Meyerton, and every one of them eventually reaches the end of its waterproofing life. In this case study, the roof slab had cracked along shrinkage joints, the surface coating had delaminated and worn away, and the building below was no longer protected from water. The owner brought in SealAll Roof Contractors to strip the roof back, repair every movement point and install a full reinforced waterproofing membrane over the entire slab.

As an approved SealPro applicator, SealAll Roof Contractors installs the complete SealPro ArmTec HyperFlex waterproofing system — the correct primer, crack reinforcement, embedded mesh and topcoat, applied in the correct sequence, so the finished membrane bridges movement instead of splitting open again.

The problem: a cracked, delaminated concrete roof slab

Flat concrete roofs live or die on their ability to move without cracking. On slabs like this one, the concrete opens up along shrinkage cracks and construction joints over time, and the original surface coating delaminates and weathers away. Debris and standing water collect on the roof, and every crack becomes a direct path for water into the ceilings and structure below. Left untreated, a failed slab leads to damp, spalling concrete, rusting reinforcement and ongoing interior damage.

The solution: the SealPro ArmTec reinforced membrane system

Our waterproofing team worked through the proven SealPro ArmTec sequence for concrete slabs:

1. Clean and prepare — the full slab was cleared of debris, loose material and standing water, then cleaned back to a sound, stable surface.
2. Prime — the slab was primed with Penetrar, SealPro’s deep-penetrating primer, to bind the concrete and lock down porosity before any waterproofing layer went on.
3. Reinforce the cracks and joints — every crack, delaminated joint and movement point was treated with Flex and StretchSeal membrane, sealing and bridging the roof’s weakest points first.
4. ArmTec mesh membrane — a coat of HyperFlex was applied and ArmTec reinforcing mesh was rolled into it across the full surface, then encapsulated with a second HyperFlex coat, creating one continuous reinforced membrane that flexes with the slab instead of cracking with it.
5. Topcoat — the system was finished with HydroSeal HF waterproof topcoat, delivering a clean, seamless, UV-resistant surface across the entire roof.

The result: a fully sealed, seamless flat roof

The finished slab is now a single, continuous waterproof membrane — no exposed cracks, no open joints and a clean, uniform finish from edge to edge. The building is protected against Highveld summer storms, and the reinforced ArmTec system is built to move with the structure for the long term. Every SealAll Roof Contractors project is backed by our workmanship guarantee and a warranty certificate on completion.

SealAll Roof Contractors is an approved SealPro applicator serving Vereeniging, Meyerton and the greater Vaal region, installing genuine SealPro ArmTec waterproofing systems for concrete roof slabs, flat roofs and crack repair.

Related SealAll Roof Contractors services: concrete slab waterproofing · roof waterproofing · torch-on alternative waterproofing across the Vaal Triangle.

Contact SealAll Roof Contractors for a free inspection and quote: 072 694 9243 · roofcontractors.co.za

#RoofSlabWaterproofing #Meyerton #VaalRoofing #SealProApplicator

Location: Meyerton, Gauteng
Service: Concrete Roof Slab Waterproofing (ArmTec HyperFlex System)

When a flat concrete roof slab starts to leak, the damage rarely stays on the roof. It works its way down through the ceiling and shows up on the walls of the rooms below. That is the pattern behind almost every slab call-out SealAll Roof Contractors handles across the Vaal: old waterproofing that has reached the end of its life and needs a full remedial overhaul rather than another patch.

The problem

On a typical failing slab, the existing waterproofing membrane has delaminated and cracked across large sections of the roof. Years of sun exposure, thermal movement and standing water lift the old coating away from the concrete, leaving weathered, spalling surfaces and open cracks at the joints and parapet junctions. Water tracks under the failed membrane and into the structure, with damp showing up on interior walls and around window and door reveals in the rooms below. Every affected area of the slab, from bedrooms to sculleries, garages and chimney upstands, tends to show the same tired, failing coating.

The SealAll Roof Contractors solution

As an approved SealPro applicator, SealAll Roof Contractors strips the project back to sound substrate and rebuilds the waterproofing as a single monolithic system:

1. Prepare and prime. Every square metre of the slab is cleaned back, loose material removed and the concrete primed with Penetrar to lock down the surface and give the new system a solid key.
2. Reinforce the weak points. Cracks, delaminated joints and parapet junctions are bridged with StretchSeal membrane, sealing the exact spots where movement has opened the old coating.
3. Install the ArmTec system. A HyperFlex base coat is applied and ArmTec reinforcing mesh embedded into it, then over-coated to create a seamless, fully bonded and elastic waterproof layer across the whole slab.
4. Seal the details. Roof vents, pipe penetrations and parapet upstands are carefully worked in so there are no gaps left for water to find.
5. Top coat and protect. The system is finished with HydroSeal HF and sealed with a clear protective coat, leaving a clean, UV-stable grey surface that reflects heat and sheds water.

The result

The roof ends up with a continuous, flexible waterproofing skin that moves with the building instead of cracking against it. Valleys drain cleanly, penetrations stay sealed and interior damp problems are cut off at their source. Backed by a workmanship guarantee and SealPro’s manufacturer warranty, a slab treated this way is set up for many dry seasons ahead.

If your flat roof or concrete slab is leaking, delaminating or staining the ceilings below, the sooner it is assessed the less it costs to fix. SealAll Roof Contractors is an approved SealPro applicator serving Vereeniging, Meyerton and the greater Vaal region.

Related SealAll Roof Contractors services: concrete slab waterproofing · roof waterproofing · torch-on alternative waterproofing across the Vaal Triangle.

Contact SealAll Roof Contractors for a free inspection and quote: 072 694 9243 · roofcontractors.co.za

#RoofSlabWaterproofing #Meyerton #VaalRoofing #SealProApplicator