Liquid Roof Waterproofing on Rear Extension in Drumcondra, Dublin

The homeowner in Drumcondra contacted MJ Roofing & More after concerns about water ingress from the rear extension flat roof. The existing felt roof had weathered over time, and the wall junction beneath the upstairs window showed visible signs of staining and previous water tracking. On inspection, our team identified several issues:

• The existing mineral felt roof had aged and lost some of its weather resistance
• Seams and laps in the felt covering were becoming vulnerable to water penetration
• The wall abutment detail required improved sealing
• Water staining was visible below the window sill and around the rear wall junction
• Perimeter edges and upstands needed reinforcement
• The roof covering required a protective waterproof coating before further deterioration occurred

Flat roofs are especially vulnerable where the roof surface meets walls, parapets, gutters and vertical upstands. If these areas are not correctly sealed, rainwater can track behind the covering and cause damp patches, internal staining and damage to the structure below. A liquid roof waterproofing system was recommended as a practical solution to extend the life of the existing flat roof and improve protection across the most exposed areas.