Metal Roof Waterproofing in Greenside

Location: Greenside, Johannesburg
Service: Metal roof sheeting maintenance and waterproofing

Ageing metal roofs are one of the most common maintenance headaches on commercial and residential buildings alike. This case study looks at a typical metal sheeting roof that had reached the point where its original coating could no longer keep the weather out — rust was creeping along the overlaps, screw lines had started to weep, and one section had corroded through completely. Prime Seal Spray was called in to strip what needed replacing, seal the rest, and give the whole roof a fresh, watertight finish built to handle many more Highveld storm seasons.

The problem

Corrugated and IBR-style metal roofs almost always fail at the same weak points: the horizontal overlaps between sheets, the side laps, and the thousands of fastener holes where screws pierce the metal. Over time, expansion and contraction works those points loose, the original coating breaks down, and rust takes hold. On this roof, streaking was visible across every sheet, and one section had corroded through entirely, letting water straight into the building below. Patching a single leak at a time was never going to solve the underlying problem — the whole roof needed proper attention.

The solution

As an approved SealPro applicator, Prime Seal Spray used a proven metal-roof system to seal every vulnerable point and lock out moisture for the long term:

  1. Strip and replace the failed section. The corroded sheeting was removed and new sheeting supplied and installed, giving a sound surface to work from.
  2. Clean and prime. The entire roof was cleaned down and treated with Purple Prime to kill rust and give the coatings a solid grip on the metal.
  3. Reinforce the weak points. Every overlap, joint, and screw line — hundreds of them across the roof — was bridged with Flex and StretchSeal to create a flexible, crack-resistant seal.
  4. Seal the fasteners. Each screw head was sealed with ScrewSeal to close off the most common leak path on any metal roof.
  5. Top-coat for waterproofing. The finished system was sealed with HydroSeal HF, a tough, flexible waterproof membrane that ties the whole roof together and reflects the sun’s heat.

The result

The roof now sits fully sealed and watertight. Every overlap and screw line is protected, the replaced section is as good as new, and the fresh waterproofing bands stand out crisply across the sheeting. No more streaks, no more patch-and-hope repairs — just a roof brought back to life and backed by a workmanship guarantee.

Metal roof problems like this are common across Johannesburg North, from ageing shopfronts to residential outbuildings. Prime Seal Spray is an approved SealPro applicator serving Greenside and the greater Johannesburg North area, bringing the same proven system to every metal roof that needs it.

Related Prime Seal Spray services: roof waterproofing · roof painting · waterproofing & painting across Johannesburg North.

Contact Prime Seal Spray for a free inspection and quote: 064 879 3553 · primesealspray.co.za

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