Chimneys are the most exposed element on any roof, taking rain from all four sides plus the top. From the older brick homes in Pretoria’s Arcadia and Hatfield near the Union Buildings to the established northern suburbs of Johannesburg, chimney leaks are one of the most common calls we get. Call 081 016 3479 before the next rain event causes more damage.

When You Need Chimney Waterproofing

Your chimney needs waterproofing when you see water staining on the ceiling or walls adjacent to the chimney breast after rain, when the chimney pot is cracked or has missing mortar, when flashings around the base of the chimney are cracked, lifted, or missing, or when the masonry on the chimney is visibly weathered or porous. Chimneys project above the roof line and are exposed to rain from all directions, they get more water on them than any other element of the building envelope.

Our Chimney Waterproofing Process

We inspect the chimney from the roof, checking the pot, the cap mortar, the stack joints, and all flashings. Cracked mortar in the chimney stack is raked out and repointed with fresh mortar or flexible pointing compound. Chimney pots are re-secured or replaced. Lead step and apron flashings that have lifted or cracked are repaired or replaced. The masonry surface is treated with a clear breathable masonry sealer that blocks water entry while allowing vapour to escape. Where chimney stacks have severe weathering, a full render encapsulation may be recommended.

Cost of Chimney Waterproofing in Gauteng

Chimney waterproofing cost in Gauteng depends on chimney height, number of pots, extent of flashing damage, and whether re-rendering is required. Free on-site assessment and written quote.

Why Choose Logiline for Chimney Waterproofing

Licensed and insured. Workmanship Warranty. We carry all chimney repair materials including lead and high-performance masonry sealers. Fast response across all of Gauteng.

Common Questions

Why does my chimney leak when it rains?

The most common causes are failed lead step flashings at the chimney base, cracked mortar joints in the stack, a cracked chimney pot cap, or open gaps in the pot mortar. Often it is more than one of these at the same time.

Can you seal a chimney without replacing the flashings?

It depends on flashing condition. If structurally sound but slightly lifted, the flashing can be re-fixed and sealed. If cracked or corroded, replacement is the correct solution, not a temporary sealant coat.

How long does chimney waterproofing last?

With new lead flashings and fresh pointing, a chimney repair typically lasts 15 years or more. Surface masonry sealers applied to the stack need refreshing every 8-10 years depending on exposure.

Chimney leaking or showing water stains? Call 081 016 3479 for a free chimney assessment.

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Further reading: waterproofing, building waterproofing materials and techniques.

Chimney Waterproofing in Gauteng, Seal Your Chimney Before the Next Rain