Guide · East Sussex · BN7
Microcement with underfloor heating — Lewes specification
For new-build microcement with underfloor heating in Lewes, the questions are about programme integration and screed compatibility — the visual finish is confirmed at sample stage. That's why the spec sheet below matters more than the aesthetic on this brief. The Lewes catchment we work across covers BN7, BN8 — reached via the A27 / A26, 15 min from brighton via the a27. Nearby coverage includes Ringmer (2 mi), Kingston near Lewes (2 mi), Firle (5 mi). Site conditions matter here: chalk substrate — dry, stable, easy to prime. That shapes the primer and sealer specification below, not just the visible finish.
Substrate and preparation
Microcement is one of the most UFH-compatible floor finishes on the market — 2 mm thickness gives fast thermal response and low resistance (0.02 m²K/W). But the screed must be commissioned to a slow heat-up schedule first, cracks resin-injected, and expansion joints honoured through the finish.
How to make it read as designed, not applied
A continuous microcement floor across a large open plan with UFH is the single most requested combination in modern-build interior design. Colour the microcement 1–2 shades darker than the joinery for the room to read as bright without going stark; sealer matt for domestic, satin for hospitality.
What we're actually installing
On-site programme
- Screed commissioningWeek 1–4
UFH commissioned to a manufacturer schedule — typically a slow ramp to 55°C then back to ambient. Cannot be skipped.
- Substrate prepDay 1–2
Cracks resin-injected, screed skimmed flat to SR2, moisture tested (below 75% RH).
- Base coat + meshDay 3
Fibreglass mesh embedded in reinforced base coat, honouring the substrate joints.
- Colour coatsDay 4–5
Two 1 mm colour coats, hand-trowelled.
- SealerDay 6–7
3 coats polyurethane floor sealer. UFH re-commissioned at 1°C per day increment after 7 days.
What to watch for on quote comparison
- ✕Firing the UFH before microcement cure — the finish crazes.
- ✕Missing substrate expansion joints — cracks telegraph through.
- ✕High-conductivity floor with a rug — creates a stress line at the rug edge.
- ✕Ambient-only cure — UFH schedules matter for both the screed and the microcement.
What's specific about Lewes for this brief
ufh-ready floors in Lewes — Q&A
Other guides for Lewes
Microcement with underfloor heating — other Sussex towns
Related products & services
The short version
Lewes ufh-ready floors in one line: mineral finish, single continuous surface, hand-applied by our own team, £90–£160 per m², 6–10 working days on site. Free survey with a written spec back inside 3 working days.