Waterproofing & Leakage
Expansion joint waterproofing for apartments and large homes
Flexible sealants and joint covers that keep water out of the gap between building blocks while letting them move.
Larger buildings are split into blocks with a gap between them so they can expand and contract. That gap is a weak point: if its seal fails, water pours straight down through every floor.
Rigid fillers crack the first time the building moves. RennovEN uses flexible systems designed to move with the joint.
Signs you need this
- Leak along a straight vertical or horizontal line
- Water entering at the same spot on several floors
- Cracked or missing joint filler on the roof or façade
The RennovEN promise
- 10-year warranty on all works
- Itemised pricing, approved before work begins
- One accountable team across every trade
- Residential specialists — homes only
Diagnosis
Why it happens
Rigid fillers
Cement or mortar in the gap cracks as the building moves.
Aged sealant
Sealants harden and debond under sun exposure.
No backer rod
Without the right depth and backing, sealant tears easily.
Our method
How RennovEN does it
- 1
Inspect
Trace the joint along roof, façade and floors.
- 2
Clean out
Remove failed fillers and debris.
- 3
Seal
Backer rod plus flexible sealant or joint cover.
- 4
Protect
Cover strips on exposed roof joints.
What’s included
- Joint inspection along its full length
- Removal of failed filler
- Backer rod installation
- Flexible sealant or joint cover system
- Roof-level protection
What affects the cost
- Running length of the joint
- Joint width and movement
- Access height
- Sealant or cover system
Every home is different, so we don’t publish rate cards. After a free inspection you get an itemised estimate, and you approve every line before work begins.
Get my itemised estimate10-year warranty
Expansion joints we seal are covered for 10 years against leakage due to our workmanship.
How our warranty worksFAQ
Expansion Joint Waterproofing: your questions
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