Roof Slab Waterproofing in Fourways
Location: Fourways, Johannesburg
Service: Roof Slab Waterproofing (ArmTec HyperFlex System)
A flat concrete roof slab is one of the hardest surfaces on any home to keep watertight. Unlike a pitched, tiled roof that sheds water quickly, a slab holds standing water after every storm and works loose at every crack. In this case, a homeowner called in a leaking balcony slab above a reception area. Inspection found a substrate that had reached the end of its waterproofing life and needed a full remedial system, not another quick patch.
The problem
The exposed concrete slab had weathered badly. The surface was stained, porous and dusty, with fine movement cracks running through it. Water was soaking into the concrete and finding its way through to the room below. Around the upstand walls and the pipe penetrations, the old detailing had failed completely, leaving obvious entry points for water.
The solution
As an approved SealPro applicator, the contractor installed the ArmTec waterproofing system — a reinforced, seamless membrane built specifically for flat slabs:
- Prepare and clean the slab. The failed surface was stripped back and all dust, loose material and contamination removed.
- Prime the substrate. A Penetrar primer was applied across the full slab area to bind the surface.
- Reinforce the movement cracks. Every crack and stress point was bridged with StretchSeal membrane.
- Detail the upstands and penetrations. Corners, upstand walls and pipe penetrations were sealed with Flex and StretchSeal.
- Install the ArmTec membrane. HyperFlex was applied with ArmTec reinforcing mesh embedded through the field of the slab.
- Topcoat with HydroSeal HF. A high-performance HydroSeal HF top layer finished the system.
The result
The slab is now a clean, seamless membrane that sheds water instead of soaking it up. Cracks are bridged, the upstands and pipe penetrations are sealed, and the room below is protected.
Prime Seal Spray is an approved SealPro applicator serving Fourways 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 Fourways, Johannesburg
- WE DID Roof Slab Waterproofing (ArmTec HyperFlex System)
- PARTNERS PrimeSealSpray, Supplyed by ExpertCoatings
- CATEGORY Roof Slab Waterproofing
- TAGS ArmTec HyperFlex System , Fourways , Johannesburg North , Roof Slab Waterproofing , SealPro Applicator
