Roof Slab Waterproofing in Craighall Park
Location: Craighall Park, Johannesburg
Service: Concrete roof slab maintenance and waterproofing (ArmTec HyperFlex System)
A flat concrete roof slab is only as good as the membrane protecting it. When that membrane reaches the end of its life, water finds every crack and joint it can exploit. This case study looks at a large, multi-section roof slab where the old waterproofing had simply given up, and shows the system used to restore it.
The problem
The existing waterproofing across the slab had delaminated and cracked badly. Long structural cracks ran through the concrete, joints between sections were separating, and much of the surface showed heavy crazing. Around the skylights and the section above the garage, the membrane was lifting away from the substrate entirely.
The solution
Working as an approved SealPro applicator, the team treated the whole slab as one system rather than patching individual failures:
- Strip and clean. The old, delaminated membrane was cut back and stripped, and the concrete cleaned down to a sound substrate.
- Prep and prime. Every surface was sealed with Penetrar primer.
- Reinforce cracks and joints. The structural cracks and separating joints were bridged with Flex and StretchSeal membrane.
- Waterproof with the ArmTec system. A coat of HyperFlex was applied and ArmTec reinforcing mesh embedded across the field.
- Seal with the topcoat. The whole roof was finished with HydroSeal HF.
The result
The slab became a single, unbroken grey membrane with no visible cracks, joints or bare patches. Every section, including the tricky areas around the skylights and above the garage, was tied into one continuous waterproof layer.
Prime Seal Spray is an approved SealPro applicator serving Craighall Park 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 Craighall Park, Johannesburg
- WE DID Concrete roof slab maintenance and waterproofing (ArmTec HyperFlex System)
- PARTNERS PrimeSealSpray, Supplyed by ExpertCoatings
- CATEGORY Roof Slab Waterproofing
- TAGS ArmTec HyperFlex System , Craighall Park , Johannesburg North , Roof Slab Waterproofing , SealPro Applicator
