Roof Valley Waterproofing in The Wilds, Pretoria

Location: The Wilds, Pretoria
Service: Roof valley waterproofing and sealing

When a tiled roof starts leaking, the valley is very often the culprit. This project in The Wilds, Pretoria involved a central roof valley where the old cement bedding had cracked and crumbled away, leaving open joints and a broken tile exactly where two roof planes channel their rainwater together. Eco Seal was called in for tile roof waterproofing — stripping the failed mortar back, re-bedding the valley and sealing it with a flexible system built to move with the roof instead of cracking again.

The problem

Over the years the original cement mortar packed into the valley had dried out, shrunk and broken apart. The photographs taken before work began show the tell-tale signs: a jagged strip of loose, powdery cement running down the valley line, a cracked tile lip and a gap opening straight through to the batten below. A valley like this concentrates a large volume of run-off during a Highveld storm, so even a small opening becomes a fast, direct leak into the roof space and ceiling. Rigid cement was never the right long-term answer here, because the constant expansion and contraction of the tiles simply keeps re-opening the cracks.

The Eco Seal solution

As an approved SealPro applicator, Eco Seal rebuilt the valley using a layered tile roof waterproofing system rather than a quick cement patch:

1. Raked out and removed all the loose, cracked and failing cement mortar from the valley line.
2. Re-bedded and made good the valley with Posi Screed to restore a sound, even base and lock the surrounding tiles back into position.
3. Primed the repaired area with Penetrar so the waterproofing membrane bonds tightly to both the screed and the tile edges.
4. Embedded StretchSeal along the full length of the valley — a flexible, elastomeric membrane that stretches and recovers with the natural movement of the roof.
5. Finished with a HydroSeal HF top coat to lock everything down under a durable, UV-stable waterproof layer.

The result

The valley is now a single, continuous, watertight channel. The crumbling cement and the open gap are gone, replaced by a sealed and flexible membrane that follows the line of the tiles and carries storm water cleanly off the roof. Because StretchSeal moves with the substrate, this repair is built to stay watertight through the seasonal expansion and contraction that broke the original cement in the first place — giving the owner in The Wilds a dry ceiling and lasting peace of mind. It is the same approach we take to all our roof repairs and waterproofing.

Contact Eco Seal for a free inspection and quote: 083 309 8164 · www.ecoseal.co.za

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