Waterproofing & Leakage
Injection grouting to seal leaking cracks from the inside
PU and cementitious injection that fills cracks and voids carrying water through concrete, without large-scale demolition.
Some leaks come through cracks and voids deep inside concrete, where surface coatings can’t reach. Water keeps finding its way through no matter how many layers you paint on top.
Injection grouting fills those cracks from inside. Small ports are fixed along the crack and a sealing material is pumped in under pressure until the path is blocked.
Signs you need this
- Water seeping through a concrete crack
- Leaks through basement walls or slabs
- Honeycombed concrete that lets water through
- Leaks returning after surface coatings
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
Through-cracks
Cracks passing through the full thickness of concrete carry water directly.
Honeycombing
Voids from poor compaction during construction form water channels.
Cold joints
Joints between separate concrete pours leak if not sealed.
Our method
How RennovEN does it
- 1
Map cracks
Identify leaking cracks and voids.
- 2
Fix ports
Drill and fix injection packers along the crack.
- 3
Inject
Inject the selected grout under pressure.
- 4
Finish
Remove packers, seal holes and finish surface.
What’s included
- Crack and void mapping
- Injection packer installation
- PU or cementitious injection
- Surface sealing and finishing
- Post-treatment check
What affects the cost
- Total crack length
- Crack width and depth
- Grout type required
- Access to the area
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
Cracks we seal by injection are covered for 10 years against leakage through the treated cracks due to our workmanship.
How our warranty worksFAQ
Injection Grouting: your questions
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