Void Filling
Underground voids can form beneath buildings and infrastructure due to washout, dissolved materials, collapsed drains, or old mine workings. These voids pose a significant risk of sudden ground collapse. Our void filling service uses controlled injection techniques to safely fill these spaces and prevent further settlement.
Key Benefits
Controlled injection process
Non-destructive method
Prevents sudden collapse
Rapid completion times
Sub-surface void detection
Suitable for all void types
Void Filling — Pros and Cons
Pros
- Prevents the risk of sudden and dangerous ground collapse
- Non-destructive — no excavation or demolition required
- Multiple fill materials available to suit different void sizes
- Fast completion with most jobs done in a day
- Specialist detection ensures voids are accurately located before filling
Cons
- Very large or deep voids may require phased filling over multiple visits
- Access to the void location may be restricted in some properties
- Ongoing drain repairs may be needed if leaking drains caused the void
- Detection methods have limitations in certain ground conditions
How It Works
Detection
Ground penetrating radar and other methods to locate and map voids.
Planning
Injection plan designed based on void size, location, and cause.
Filling
Controlled injection of grout or resin to fill the void safely.
Verification
Post-treatment scanning confirms complete void filling.
Frequently Asked Questions
How do voids form under buildings?
Common causes include collapsed or leaking drains washing soil away, natural dissolution of rock, old mine workings collapsing over time, and degraded fill materials compacting or breaking down beneath foundations.
How do you detect underground voids?
We use several proven methods. Ground penetrating radar (GPR) is our primary tool, supplemented by dynamic cone penetrometers and trial pits where needed. These allow us to accurately locate and map voids beneath your property before designing a filling plan.
What materials are used for void filling?
It depends on the void size and ground conditions. We use geopolymer resin for smaller voids and precision work, cementitious grout for larger cavities, and foamed concrete where high-volume filling is required. Each is chosen for maximum effectiveness.
Is void filling disruptive?
No, the process is minimally invasive. Small injection holes are drilled through the surface, and the filling material is pumped in under carefully controlled conditions. There's no excavation and most jobs are completed within a day.
Void Filling Across Merseyside
We provide void filling services throughout Merseyside. Click a location for local details.
Free Void Filling Quote
No obligation — across Merseyside
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