Cardiff foundations
Resin injection in Cardiff for weak or washed out ground
Find out whether resin injection suits the ground beneath your home. Send a description of what you have noticed and receive guidance at no cost before any specialist visits.
How it works
Geopolymer injection beneath footings
A geopolymer resin is pumped into voids or loose soil to compact and stabilise the ground supporting the wall.
- Where the ground suits it Loose fill, washed-out sand or gravel where the resin expands and compacts soil.
- Where it falls short Heavy clay that shrinks seasonally usually needs concrete bays or piles instead.
- Access for the work Small holes are drilled through floors or paving so pipes reach footings.
- Disruption inside the home No trenches are dug, so rooms stay usable and gardens avoid excavation damage.
Resin vs concrete underpinning for your home
Both methods stop movement, but they suit different ground conditions. The right choice depends on what lies beneath the footings.
Ground type
- Resin injection
- Suits loose fill, voids or granular soil where expansion compacts the ground.
- Mass concrete underpinning
- Used where clay shrinks and swells, or loads need transferring to deeper strata.
Excavation
- Resin injection
- Requires only small drilled holes rather than open trenches along the wall line.
- Mass concrete underpinning
- Involves digging bays beneath the existing foundation in a set sequence.
Time on site
- Resin injection
- Often completed within a single day for one affected wall section.
- Mass concrete underpinning
- Takes longer because each bay must cure before the next one opens.
Internal disruption
- Resin injection
- Furniture can often stay in place since no trenching happens inside the room.
- Mass concrete underpinning
- Skirting boards, floorboards and internal finishes often come up during the dig.
A specialist inspects the ground and advises which method fits after looking at the job.
What to look for before asking about resin
The real question is not what the crack looks like but how soon you should act. Only a physical inspection settles whether the ground beneath your footings is loose enough for geopolymer injection or needs something else entirely.
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A crack opened quickly above a window after heavy rainToday
Fast movement following rain suggests water has washed fine particles from beneath the footing, leaving a void that resin might fill if caught early enough.
What to do Describe the timeline and location when you send an enquiry so the right specialist responds.
-
Floor slopes slightly near an external wall in a terraced houseSoon
Terraced homes in areas like Grangetown share party walls, so ground injection subsidence repair still applies if the soil under the outer footing has compacted unevenly over time.
What to do Note which rooms feel uneven and whether doors nearby stick when you report it.
-
Hairline cracks appear each winter and close again by summerWorth watching
Seasonal opening and closing points to clay shrinkage rather than a permanent void. Resin does not fix seasonal clay movement, so monitoring matters more here.
What to do Track the width across seasons using the guidance on monitoring a crack before deciding on next steps.
-
Paving slabs outside have sunk away from the wallSoon
External settlement often shows first where drains leak or soil washes out. A non invasive foundation repair approach can reach these spots without lifting large paved areas.
What to do Check whether any downpipes or drains run directly beneath the sunken slabs.
None of this diagnoses your home specifically. If a crack has appeared suddenly or is widening fast, ask about it now rather than waiting to see what happens next.
Areas covered for resin injection around Cardiff
Enquiries are taken for homes across Cardiff and nearby towns. The specialist firms handling ground injection subsidence repair travel throughout the city, including older terraces and newer estates alike.
If your street is not mentioned, send an enquiry anyway, as coverage extends beyond the main suburbs.
Ask whether resin injection suits your home
Send details of what you have noticed. The information goes to a specialist who deals with foundation repair in Cardiff, and nothing commits you to booking work or paying a fee at this stage.
- No obligation to proceed
- Free initial guidance
- Local specialists only