Roof Slab Waterproofing in Sasolburg
Location: Sasolburg, Free State
Service: Roof Slab Maintenance & Waterproofing
A flat concrete roof slab had reached the end of its waterproofing life. Years of UV exposure and thermal movement had taken their toll, and the existing membrane was no longer keeping water out. An approved SealPro applicator was brought in to strip back the failed system and reinstate a durable, fully bonded waterproofing layer across the entire roof deck.
The problem
On inspection, the roof showed several classic signs of an ageing waterproofing system nearing failure. The existing membrane had delaminated and cracked in multiple areas, breaking the waterproof seal, while joints and laps were separating and creating open pathways for water ingress. Water was puddling in front of several outlets — a sign that drainage falls had degraded and water was no longer running off as designed. The coating had also lost its UV protection, leaving the substrate underneath exposed and vulnerable, and flashing details at the parapet walls and upstands were deteriorating, with cracked cement fillets and lifting edges. Left unaddressed, this combination of failed joints, ponding water and UV-degraded coating would have led to water tracking into the slab itself, risking damage to the structure and the ceilings below.
The solution
The applicator specified a SealPro flat-slab waterproofing system built for exactly this kind of failed, aged concrete deck. The remedial process covered the full roof slab and followed these steps:
- Strip and prepare the substrate — All loose, cracked and delaminated sections of the old membrane were removed, along with any debris and contamination, to expose a sound working surface.
- Repair joints and details — Cracked joints, parapet upstands and outlet surrounds were repaired and detailed before any coating went down, closing off the points where water had been getting in.
- Prime the substrate — A bonding primer was applied across the full roof area to promote adhesion and seal the porous concrete surface.
- Apply the waterproofing system — The membrane was rolled on in overlapping bands to build an even, fully bonded, seamless waterproof layer across the whole slab, including any adjoining sections tied into the same roof structure.
- Quality control and finish — Each section was checked for full coverage and consistent thickness before moving on, with drainage points, pipe boots and upstands finished off last to complete the waterproof seal at every detail.
The result
The roof now carries a continuous, UV-stable membrane with no open joints, no delaminated patches, and correctly sealed drainage points and flashing details. The ponding that had been forming in front of the outlets is gone, and the roof is protected against the sun and rain for years to come, backed by the standard manufacturer warranty on the system.
This is the kind of slab failure we see on older flat-roof properties throughout the region: a membrane that’s quietly cracked, delaminated or lost its UV protection long before a leak shows up on the ceiling below. SealAll Roof Contractors is an approved SealPro applicator serving Vereeniging, Sasolburg and the greater Vaal region, bringing the same strip, repair, prime and waterproof process to every slab roof job we take on.
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 #Sasolburg #VaalRoofing #SealProApplicator
Roof Slab Waterproofing in Sasolburg
Location: Sasolburg, Free State
Service: Roof Slab Maintenance & Waterproofing
Flat concrete roofs take a beating in the South African sun, and this case study shows exactly how that damage builds up — and how a professional waterproofing system reverses it. The roof slab in question had reached the end of its waterproofing life: the coating had lost its UV protection, the concrete beneath it was cracked and exposed, and water had started finding its way through to the ceilings below.
The problem was more than just a worn coating
On inspection, the roof slab showed clear surface cracking and exposed concrete across large sections. The original waterproofing membrane had degraded under years of sun exposure, leaving the substrate unprotected. Cracks had opened up along the parapet walls, and a poorly positioned outlet was letting water pool on the roof instead of draining away. Inside the house, the damage was already visible — a ceiling stain was the tell-tale sign that moisture had been tracking through the slab for some time.
The solution
Working as an approved SealPro applicator, the crew designed a full re-waterproofing solution built to handle a large flat concrete roof under constant sun and thermal movement:
- Correct the water flow. The roof outlet was opened up and adjusted to stop water pooling and direct it away from the slab properly.
- Strengthen the cracks. Every crack across the roof slab and parapet walls was reinforced with a flexible waterproofing membrane, giving the substrate room to move without reopening.
- Prep and prime the substrate. The full roof area was cleaned, prepared, and primed to give the new system a sound base to bond to.
- Apply the waterproofing system. A complete SealPro coating system was applied across the slab in multiple passes, sealing the entire roof in a durable, UV-stable waterproof membrane.
The crew worked the roof in sections, applying the reinforcing membrane by hand along every crack line before rolling out the full-coverage topcoat.
The result
The roof now carries a continuous, seamless waterproof membrane, with every crack reinforced and drainage corrected so water no longer sits on the slab. The finished surface has a clean, UV-reflective coating that protects the concrete and keeps the ceilings below dry for years to come.
Flat and slab roofs across the Vaal face the same sun exposure and thermal movement — which is why a proper crack-reinforcement and full-membrane system, not just a fresh coat of paint, is what actually stops the leaks from coming back.
SealAll Roof Contractors is an approved SealPro applicator serving Vereeniging, Sasolburg 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 #Sasolburg #VaalRoofing #SealProApplicator
Metal Roof Waterproofing & Painting in Sasolburg
Location: Sasolburg, Free State
Service: Metal Roof Rust Treatment, Waterproofing & Painting
Corrugated metal roofs take a beating from Highveld sun and summer hail, and once the paint layer starts to chalk and the joints start to lift, rust moves in fast. This case study walks through a typical metal roof rescue: a sheeting roof that had gone from faded and rusted to fully sealed, waterproofed and repainted.
The problem
The roof sheeting had faded to a patchy, chalky finish, with rust taking hold across several panels. The worst damage sat at the overlaps and screw lines, where old sealant had cracked and lifted and corrosion had eaten right through in places, leaving open holes and blistered metal. Left alone, those failed joints and rusted fixings are exactly where water finds its way into the roof structure. A low-pitch section of the roof also had old waterproofing that had worn thin and was no longer sealing reliably.
The solution
As an approved SealPro applicator, the crew followed a full remedial system rather than simply painting over the damage:
- High-pressure clean and degrease of the entire roof to strip chalking, dirt and loose material back to a sound surface.
- Rust treatment — corroded sections were wire-cleaned and treated with a rust converter to stop the corrosion spreading further.
- Prime the sheeting with a purpose-made metal primer to lock down the substrate and give the coating system something to grip.
- Seal the joints and screw lines — weak points were reinforced with a flexible sealant and stretch tape, and every fixing sealed so the overlaps and fasteners are fully watertight.
- Waterproof the low-pitch section with a reinforced membrane system — primer, flexible detailing at the joints, then a fibre-reinforced topcoat for a seamless, durable membrane.
- Paint the roof with two full coats of high-quality roof paint for a rich, even, UV-stable finish.
The result
The tired, rusted roof reads as a clean, uniform finish from ridge to eaves, with the joints and screw lines properly sealed underneath rather than just hidden. The low-pitch section is protected by a continuous waterproof membrane, and the whole roof is set up to handle Vaal-region weather for years to come. A cosmetic refresh and a genuine waterproofing upgrade in one project — the kind of job that keeps a metal roof watertight for another decade instead of just looking good for one season.
If your roof sheeting is showing the same warning signs — chalky paint, rust at the overlaps, sealant lifting at the screw lines — it’s worth having it inspected before the next heavy rain finds the gap. SealAll Roof Contractors is an approved SealPro applicator serving Vereeniging, Sasolburg and the greater Vaal region.
Related SealAll Roof Contractors services: roof waterproofing · roof coating and painting · roof maintenance across the Vaal Triangle.
Contact SealAll Roof Contractors for a free inspection and quote: 072 694 9243 · roofcontractors.co.za
#MetalRoofWaterproofing #Sasolburg #VaalRoofing #SealProApplicator
Tile Roof Ridge Waterproofing & Repaint in Sasolburg
Location: Sasolburg, Free State
Service: Tile Roof Ridge Waterproofing & Repaint
A large tiled-roof property — a main house, a studio and a separate office building — needed urgent attention after years of sun, movement and weathering had taken their toll on the ridge cement across all three roofs. The valleys on the main house had also silted up and cracked. The property owner brought in an approved SealPro applicator to repair, waterproof and fully repaint close to 900m² of tiled roofing.
The problem
On inspection, the ridge caps on all three roofs were cracked, and in several places the fibre-cement filling was missing altogether — leaving open gaps at the ridge line where water could track straight into the roof structure. The valleys on the main house were blocked with debris and had loose, cracked tiles, a common failure point that lets water pool and seep under the tile courses instead of running off. None of this was visible from the ground, but up close the cracked joints and crumbling fill lines told the full story of a roof overdue for maintenance.
The solution
The applicator carried out a full ridge and valley remedial programme before repainting the entire tiled surface:
- Rake out and re-fill — All 119 linear metres of cracked ridge cement across the main house, studio and office roofs were raked out and re-filled with fresh fibre cement to restore a solid, even base.
- Prime the substrate — Each repaired ridge was primed to ensure the waterproofing membrane bonded properly to the substrate.
- Waterproof the ridges — The ridges were reinforced and sealed using SealPro’s Stretch Seal ridge system, a flexible waterproofing membrane built to move with the roof rather than crack again under thermal expansion.
- Repair and seal the valleys — On the main house, 12 blocked valleys were cleared, loose and broken tiles replaced or resealed, and the valley lines waterproofed to restore free water flow off the roof.
- Prep and wash — The full roof area on all three buildings was thoroughly washed down to remove lichen, dust and loose material ahead of painting.
- Two-coat roof repaint — The entire roof surface — main house, studio and office — was coated in two coats of Marley M22 Ultimo roof paint in Slate, applied by hand from ridge to eave for even, durable coverage.
The result
What was a faded, cracked terracotta roof is now a uniform, deep slate-grey finish across all three roofs, with every ridge and valley properly sealed against water ingress. The repaint refreshed the look of the whole property, but the ridge and valley waterproofing addresses the root cause of the original problem — cracked joints and blocked water paths — giving the homeowner a roof that’s protected for years to come, not just repainted over existing defects.
This is the kind of ridge and valley failure we see across older tiled roofs throughout the region: waterproofing that’s cracked or gone missing at the joints, quietly letting water into the roof structure long before a leak shows up inside. SealAll Roof Contractors is an approved SealPro applicator serving Vereeniging, Sasolburg and the greater Vaal region, bringing the same rake-out, prime, waterproof and repaint process to every ridge and valley job we take on.
Related SealAll Roof Contractors services: weatherproof roof tiles · roof waterproofing · roof coating and painting across the Vaal Triangle.
Contact SealAll Roof Contractors for a free inspection and quote: 072 694 9243 · roofcontractors.co.za
#TileRoofRidgeWaterproofing #Sasolburg #VaalRoofing #SealProApplicator