Across Christchurch, thousands of homes and commercial buildings still rely on Butynol membranes applied decades ago. With time,

UV exposure, ponding, and harsh Canterbury winds cause cracking, lifted seams, and surface chalking — but in most cases, you don’t need a full replacement.

• At CanSeal, we specialise in Butynol restoration, bringing ageing roofs back to watertight condition through our multi-stage process:
   Inspection & cleaning — full substrate check, moisture detection, and industrial washing.
   
• Seam re-bonding & detailing — fixing lifted joints, outlets, and penetrations.

•  Crack repair & re-patching — seamless adhesion with compatible Butynol-grade materials.

•  UV-stable liquid overlay — applying a flexible, reflective coating to renew the membrane’s lifespan.

This method restores integrity while saving 40 – 70 % of the cost of replacement. It’s ideal for flat or low-pitch roofs on homes, schools, and commercial sites — especially here in Canterbury, where UV intensity accelerates deterioration.
If inspection shows the membrane is beyond restoration, we also offer full replacement or conversion to TPO, always ensuring proper substrate correction and drainage slope.