Skylight Flashing Waterproofing in Kimiad, Pretoria

Location: Kimiad, Pretoria
Service: Skylight flashing & glazing waterproofing repair

A glass lantern skylight brings natural light into a room in the best way possible, but the metal flashing and silicone seals that hold the glass panels together take a beating from the sun, rain, and years of thermal movement. That was exactly the situation on this raised glass roof section in Kimiad, Pretoria, where the flashing and glazing had reached the end of their service life and needed urgent attention before the next rainy season.

The problem with the raised glass section

The pyramid-style glass skylight sits proud of the main corrugated roof, with metal flashing wrapping around its base to seal the join between the glass structure and the roof sheeting below. Up close, the extent of the deterioration was clear: the corner posts of the flashing were heavily corroded, with rust bleeding down the metal and lifting the surface coating. Along the glass ridges, the original silicone sealant had cracked, shrunk, and pulled away from the glass edges, leaving gaps that were letting moisture track in every time it rained.

The Eco Seal solution

As an approved SealPro applicator, Eco Seal put together a two-part repair to address both failure points on this skylight:

1. Glazing seal renewal — all of the old, cracked silicone along the glass ridges and joints was cut out and removed back to a clean substrate.
2. New UV-stable silicone — the glazing joints were resealed with a UV-stable silicone, chosen specifically because it holds up to constant direct sun exposure on an elevated glass structure without cracking and shrinking.
3. Flashing waterproofing — the raised flashing section at the base of the skylight, where the metal meets the roof sheeting, was treated with the StretchSeal waterproofing system — a flexible, elastomeric membrane that bridges the corroded metal and roof joint and keeps moving with the structure.
4. Detail work at the corners — extra attention was paid to the internal corners and valleys where the flashing meets the roof ridges, the highest-risk points for water ingress on this type of structure.

The result

The skylight now has a fully sealed, weatherproof join between the glass lantern and the roof below. The new UV-stable silicone gives the glazing a clean, watertight finish, and the StretchSeal-treated flashing has closed off the corroded joints that were the main point of water entry. This is the same detailed roof repairs and waterproofing and waterproofing we deliver across Pretoria East. The homeowner now has a skylight that lets the light in without letting the water in.

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

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