AL1 · A1081 / M25 J22 · 0 mi from St Albans
Subfloor Prep for Wood, Vinyl & Tile — St Albans Central
In St Albans Central the three most common subfloor issues we fix are: uneven concrete from 70s/80s extensions, chipboard sub-decks that have loosened over time, and screed that hasn't fully dried before flooring is installed. Each needs a different fix — we quote based on which one you have.
From £420 · Level survey £180 (refunded against booked work). Latex from £14/m², ply overlay from £22/m².
Typical turnaround: 1–3 days including cure time; larger areas 3–5 days.
What you're seeing in St Albans Central
Common signs we diagnose in AL1 subfloor levelling calls:
- Existing floor lifting at joints or edges
- Springy sections when walked on
- Hollow-sounding spots when you tap the floor
- Doors dragging on the floor as it moves
- New flooring installer refusing to lay without prep — first sign the base is out of tolerance
Why St Albans Central clients pick us
- We prep for our own installs and for other flooring contractors — same standard both ways
- We follow BS 5325 and BS 8203 for subfloor preparation — the standards flooring warranties require
- We prep for our own installs and for other flooring contractors — same standard both ways
- We follow BS 5325 and BS 8203 for subfloor preparation — the standards flooring warranties require
What's actually happening
The likely root causes in St Albans Central's georgian townhouse homes and along A1081 / M25 J22:
- 1
Cut floorboards notched for services (heating pipes, cabling)
- 2
Settlement in older {stock} homes causing local dips
- 3
Chipboard sub-deck screws working loose over 20+ years
- 4
Wet-lay screed under UFH that wasn't fully cured before floor install
- 5
Extension floor poured at different height from the original
Our repair process in St Albans Central
Step 1
Level survey
Straight-edge and laser survey across the whole area. We map high and low points, moisture-test the sub-deck, and give you a written spec of what needs doing.
Step 2
Fix loose or damaged sub-deck
Re-screw perimeter, replace damaged boards, packer under joists where levelling is required. Structural first, cosmetic second.
Step 3
Apply DPM if needed
For concrete without a moisture barrier we apply a two-coat epoxy DPM (Bona R540 + R580) or a bituminous membrane, depending on moisture readings.
Step 4
Latex self-levelling compound
Feather in dips with fibre-reinforced latex compound; pour a proper self-levelling layer where the deviation is large. Cures in 24 hours to a flooring-ready surface.
Step 5
Ply overlay where needed
For older sub-decks or where levelling depth would be excessive, we overlay with 5.5mm ply screwed at 150mm centres — the flooring industry standard for a stable base.
Materials & method
Exactly what we use on St Albans Central subfloor levelling jobs — no vague "trade-quality" waffle.
- Ardex A45 or Mapei Ultraplan latex self-levelling compound
- Bona R540 mist primer + R580 moisture barrier — for concrete DPM
- 5.5mm structural plywood BB grade — for sub-deck overlay
- Timbre Turbo-Drive 4x40 screws for perimeter and grid re-fixing
Timeline: 1–3 days including cure time; larger areas 3–5 days. · Price: from £420 · Level survey £180 (refunded against booked work). Latex from £14/m², ply overlay from £22/m².
The straight answer for St Albans Central
For georgian townhouse homes in St Albans Central, subfloor conditions vary hugely. What worked in 1978 doesn't meet modern tolerance. We survey, level, and prep to current standards — so your new floor is on a base that matches what it was designed for.
Subfloor Levelling in St Albans Central — common questions
- How long does the latex take to dry before flooring can go on?
- 24 hours for foot traffic, 48 hours minimum before flooring is laid, 72 hours ideal. Wet compound under a moisture-sensitive floor is a recipe for a failure. We schedule around this.
- Can I DIY the levelling?
- For small feathering, sometimes yes. For anything over 5mm depth or requiring DPM or overlay, we'd recommend against it — the compound and prep skills matter, and re-doing it is more expensive than doing it right first time.
- Can I lay engineered wood on an uneven concrete floor?
- Only with proper preparation. Modern click-together engineered systems need 3mm/2m or better. Beyond that, the click joints stress, then fail. Latex first, floor after — no shortcut.
- Can you level over a chipboard sub-deck?
- Yes — but we usually re-screw the deck first (perimeter and joist centres), and if it's badly out of level we overlay with ply. Feathering latex directly onto chipboard rarely holds long-term.
- Do you cover St Albans Central for subfloor levelling?
- Yes — St Albans Central (AL1) is on our regular St Albans route. We do subfloor prep for our own flooring installs and also for other flooring contractors in the area.
- How much does subfloor levelling cost in St Albans Central?
- Latex self-levelling is typically £14–£22/m² depending on depth. Ply overlay is £22–£30/m². For a typical open-plan AL1 kitchen-diner, £600–£1,600.
Moisture-test your St Albans Central concrete
Free assessment during the quote visit. Numbers, not guesses.
Nearby AL areas we cover
Not all combinations are live yet — where a nearby link 404s, the same team still covers that area.