Roof Slab Waterproofing in Melville
Location: Melville, Johannesburg
Service: Concrete roof slab waterproofing (ArmTec HyperFlex System)
A flat concrete roof slab had reached the end of its original waterproofing membrane. The coating had delaminated and cracked, the joints between slab sections had opened up, and water was tracking into the building below. The owner brought in a SealPro-approved applicator to strip the failed system and install a fully bonded, reinforced membrane.
The problem
Flat roof slabs are unforgiving. Once the original membrane loses its bond to the concrete, water finds every hairline crack and open joint, then spreads sideways underneath the coating. On this roof, the surface was weathered, stained, and blistered, the membrane had lifted away from the substrate in sheets, and the joints between slab sections had opened up.
The solution
Working across roughly 218 m² of roof, the applicator installed the reinforced ArmTec slab system in six steps:
- Strip the failed membrane and thoroughly clean and prepare the concrete substrate.
- Prime the prepared slab with Penetrar.
- Detail all joints, upstands, and problem areas with Flex bedded into StretchSeal reinforcing tape.
- Apply HyperFlex with the ArmTec reinforcing mesh fully embedded across the field of the slab.
- Finish with two coats of HydroSeal HF as the seamless, UV-stable waterproof topcoat.
- Carry out ceiling maintenance below, replacing and repainting the damaged sections.
The result
The roof became a clean, continuous grey membrane with no open joints and no weak points. The reinforced ArmTec mesh gives the slab the strength to move without cracking, while the HydroSeal HF topcoat sheds water and stands up to year-round sun exposure.
Prime Seal Spray is an approved SealPro applicator serving Melville and the greater Johannesburg North area.
Related Prime Seal Spray services: roof waterproofing · waterproofing & painting across Johannesburg North · waterproofing & painting in Randburg.
Contact Prime Seal Spray for a free inspection and quote: 064 879 3553 · primesealspray.co.za
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- CLIENT Melville, Johannesburg
- WE DID Concrete roof slab waterproofing (ArmTec HyperFlex System)
- PARTNERS PrimeSealSpray, Supplyed by ExpertCoatings
- CATEGORY Roof Slab Waterproofing
- TAGS ArmTec HyperFlex System , Johannesburg North , Melville , Roof Slab Waterproofing , SealPro Applicator
