My Floor Has Damp Issues — Can I Still Fit LVT? What Cambridgeshire Homeowners Must Know First
Known damp under your floor? When LVT can still go down, when it cannot, and the options we use in Peterborough and Cambridgeshire homes.
Key takeaways
The short version, checked by our fitting team.
You can often fit LVT on a floor with a damp history, but only once the cause is found and the subfloor is dry enough or protected.
LVT is waterproof from above but does not cure damp from below, and it can trap moisture that leads to adhesive failure, lifting and mould.
Leaks and untreated rising damp need a plumber, builder or damp specialist before any flooring goes down.
Where only low background moisture remains, a damp-proof membrane or moisture-suppressant system can be used, itemised in the written quote.
Short answer: often yes, but only once the cause of the damp is found and the subfloor is dry enough or properly protected. LVT is waterproof from above. It does not cure damp coming up from below, and it can trap it. Fix the source first, then fit. LVT starts from £35/m² supply and fit in Peterborough.
We are Cambridgeshire Carpets, a supply-and-fit flooring company with a showroom in Peterborough. We are often asked to fit luxury vinyl tile (LVT) in homes where the owner already knows there is a damp problem: a musty corner, a tidemark on the skirting, or a floor that a surveyor flagged. This guide is for that homeowner. It covers the types of damp we see in Peterborough and across Cambridgeshire, why they matter for LVT, your options, and when we will tell you not to fit at all.
Can you lay LVT on a damp floor?
Not on a floor that is actively wet or has an untreated damp problem. Yes on a floor where the cause has been dealt with and the subfloor is dry enough, or where a suitable moisture barrier or moisture-suppressant system is used. The key point is that LVT is a surface. It stops spills soaking in from above, but moisture rising through a concrete slab still needs somewhere to go. Cover it with an impermeable floor and it collects underneath. Our guide is LVT waterproof? explains the difference between water-resistant from above and protected from below.
What kind of damp do you have?
The answer depends on where the moisture comes from. These are the four types we meet most often.
Rising damp in older solid floors
Many older homes, including Victorian terraces in PE1 and cottages in Fenland villages, have solid ground floors laid without a damp-proof membrane, or with one that has failed. Ground moisture moves up through the slab. Signs include a cold, slightly dark floor, salts on old tiles, and damp at the base of walls.
Condensation
Condensation forms when warm, moist air meets a cold surface. It shows up as mould on walls, window reveals and cold corners, especially in kitchens and bathrooms. It is a ventilation and heating issue, not a floor issue, although cold solid floors can make it worse.
Leaks
A leaking pipe under the slab, a dripping waste under a sink or a failed shower seal can soak a floor in one area. Leaks need a plumber before anything else.
Construction moisture in new screeds
In newer homes, such as those in Hampton and Cardea, the concrete or screed holds water from when it was laid. It dries out over time. A floor in a recently completed house, or one with a new extension, may look dry on top and still be releasing moisture.
Why does damp matter so much for LVT?
- Adhesive failure. Glue-down LVT relies on the bond to the subfloor. Moisture from below can break that bond down.
- Lifting and gapping. Once the bond goes, tiles and planks can lift at the edges, ripple or open up at the joints.
- Mould and smell. Moisture trapped under any floor can lead to mould and a musty smell, even if the surface looks perfect.
- Pushing the problem elsewhere. If the floor is sealed, moisture can move to the edges and show up at the base of walls.
Manufacturers set subfloor moisture limits in their fitting instructions. Fitting over a floor that is too wet risks the product failing early.
How do we test for damp before fitting LVT?
At the free home visit, we carry out a moisture check on concrete and screed floors where LVT or vinyl is planned. We also look at the walls, skirting and any signs of past problems, and ask about the age of the floor and any work done. If the reading or the signs point to a problem, we tell you before we quote. The step-by-step process is covered in our guide to moisture testing before LVT in Fenland homes, which applies equally in Peterborough.
What are your options if the floor is damp?
1. Fix the source first
If the damp comes from a leak, a broken gutter, bridged walls or failed damp-proofing, that needs the right trade, such as a plumber, builder or damp specialist. We are flooring fitters, so we do not diagnose or repair structural damp. Once the cause is sorted, the floor needs time to dry before we return.
2. Let a new screed dry
For construction moisture, time is usually the answer. We can fit carpet now and LVT later, or check the floor again when it has had longer to dry.
3. Use a damp-proof membrane or moisture-suppressant system
Where the cause is residual or background moisture rather than an active leak, a surface damp-proof membrane or moisture-suppressant system can be applied before levelling and fitting. This is itemised in the written quote. We do not give a figure in advance, as it depends on the floor.
4. Choose the right type of LVT
Click-lock LVT floats over the subfloor. With an integrated or separate moisture barrier, it can suit floors with low background moisture. Glue-down LVT, including premium glue-down Karndean and Amtico, needs a dry, sound, level subfloor. Our guide to click-lock vs glue-down LVT compares them in full.
| Feature | Click-lock LVT | Glue-down LVT |
|---|---|---|
| How it is fitted | Floats over an underlay or moisture barrier | Bonded to a levelled subfloor |
| Tolerance of low background moisture | Better, with an integrated or separate barrier | Needs a dry subfloor or a suitable membrane first |
| Subfloor preparation | Flat enough for the joints to lock | Smooth and level, often with levelling compound |
| Typical price (supply and fit) | Mid-range click-lock and rigid-core £35–£50/m² | Premium glue-down Karndean and Amtico £50–£70+/m² |
When should you not fit LVT at all?
- Active leaks. Until the leak is repaired and the floor has dried, no flooring should go down.
- Untreated rising damp. A floor with no working damp-proofing and clear damp signs needs treatment first.
- Wet rooms. A level-access shower floor needs a proper wet room system, not standard LVT. See our wet room flooring service.
- Floors still drying after a flood. Wait until the slab has dried and been checked.
What do we do in each situation?
| Situation | What we do |
|---|---|
| Older solid floor, slight background moisture, no active damp | Moisture check, then a damp-proof membrane or moisture-suppressant system where appropriate, levelling and LVT |
| Untreated rising damp, damp walls | Advise you to have it treated by a damp specialist first; we return once it is dry |
| Condensation and mould on walls | Suggest improving ventilation and heating; the floor is usually not the cause |
| Leak under a sink, bath or slab | No fitting until a plumber has fixed it and the floor has dried |
| New screed in a new-build or extension | Check moisture; fit carpet or click-lock with a barrier now, or wait for glue-down |
| Bathroom with damp history but now dry | Glue-down LVT or sheet vinyl on a prepared, dry subfloor |
What does LVT cost on a floor that has had damp?
LVT costs from £35/m² supply and fit in Peterborough. Mid-range click-lock and rigid-core is £35–£50/m², and premium glue-down Karndean and Amtico is £50–£70+/m². Subfloor levelling is £5–£15/m² where needed. As an example, a 12 m² kitchen in mid-range LVT starts at 12 m² × £35 = £420, and levelling that floor would add 12 m² × £5 = £60 to 12 m² × £15 = £180. A damp-proof membrane or moisture-suppressant system is itemised separately in the written quote. Full bands are on our page of carpet and flooring prices in Peterborough.
If LVT turns out not to be right for the room, sheet vinyl is another option. See our vinyl flooring in Peterborough page, or our full range of LVT flooring in Peterborough. We work across Peterborough and the surrounding PE postcodes.
Book a free home visit to check your floor
If you know your floor has a damp history, tell us when you book. We will bring samples, carry out a moisture check, explain your options plainly and send a written quote within 24 hours. Our own team fits every floor, with a 2-year workmanship guarantee. Call 01733 924009, Monday to Friday 9am–5pm, to book your free home visit.
Need a floor fitted?
Book a free home visit — we bring samples, measure up and send a written quote within 24 hours.
Book a free home measurementCan I fit LVT over a damp concrete floor?
Not until the cause is found and dealt with. If only low background moisture remains, a damp-proof membrane or moisture-suppressant system can go down first, itemised in the written quote. Active leaks and untreated rising damp must be fixed by the right trade before any flooring.
Does LVT stop damp?
No. LVT is waterproof from above, so spills will not soak through. It does not cure damp from below, and an impermeable floor can trap moisture underneath, leading to adhesive failure, lifting and mould.
Is click-lock or glue-down LVT better for a floor that has had damp?
Click-lock with an integrated or separate moisture barrier is often more tolerant of low background moisture. Glue-down needs a dry, level subfloor or a suitable membrane first. We advise after a moisture check at the home visit.
How long should a new screed dry before LVT?
It depends on the screed, its depth, the season and ventilation, so we do not guess. We check the moisture at the home visit. If it is still too wet for glue-down, we suggest waiting, a barrier, or carpet first.
Who can check my floor for damp near me in Peterborough?
We carry out a moisture check on concrete floors at our free home visit across Peterborough and Cambridgeshire. For structural damp or leaks, you will need a damp specialist or plumber, and we will tell you if that is the case.
Can you fit LVT in a wet room?
No. A level-access shower floor needs a dedicated wet room system rather than standard LVT. Wet room flooring costs £35–£60/m² installed.
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