APX-RG/01·Single-ply & flat-roof systems·Reading & the M4 corridor EST 2007·BS 8217 / BS 6229 compliant·£10m PL / £5m PI
Currently on site · Wokingham · 412 m² single-ply

Flat roofs that outlast their warranty.

A specialist flat-roof and single-ply contractor based in Reading. TPO, EPDM, single-ply mech-fix, GRP and lead-warm systems for commercial and high-spec residential work across the M4 corridor. Every detail to BS 8217 / BS 6229. Twenty-year insurance-backed warranty as standard.

2,140 m² shipped last month 20-year IBG warranty BBA-approved systems only
Systems we fit TPO single-ply EPDM Mech-fix PVC GRP cold-applied Lead-warm hybrid Sedum & biodiverse Mastic asphalt
// Signature build-up

The bit you can’t see does the heavy lifting.

Most flat roofs fail at the deck or the vapour barrier, never at the membrane. We design every system from the substrate up — tap a layer to see what we’d actually spec on a 400 m² warm-roof refurbishment.

TopDeck
// Layer 03 of 06

PIR insulation, taper-cut

Polyisocyanurate boards cut on a 1:80 fall and bonded to the vapour layer. We’d specify Recticel Eurothane or equivalent BBA-certified board, lambda 0.022 W/mK. Boards are staggered to break the joint pattern and reduce thermal bridging at every edge.

Thickness
120 mm
U-value contribution
0.18 W/m²K
Standard
BS EN 13165
Certification
BBA 17/5379
// Why Apex

Five things every tender we win has in common.

We don’t do everything. We do flat, single-ply and lead-hybrid — on commercial buildings, high-spec extensions, and the occasional listed-building refurbishment that needs a modern warm-roof solution.

// 01

In-house designed, never copied off the spec sheet.

Every roof is drawn up by our own technician before a single board is cut. Falls, edge details, abutments, pipe penetrations — all to scale. You see the drawings before we order materials.

100%
Jobs drawn in-house
// 02

Twenty-year insurance-backed warranty — the kind that survives us going bust.

Every full re-roof carries a HomePro IBG that’s independent of our trading status. If we’re no longer here in nineteen years, your warranty still is. The membrane manufacturer covers the next ten on top of that.

20years
IBG, every system
// 03

Trained installers — not the agency lad whose name nobody remembers.

Six fitters, all manufacturer-accredited on the systems we fit. Sika, Bauder, Sarnafil cards re-tested every year. We don’t carry a single subcontractor on the books; every man on your roof is on our payroll.

6
Manufacturer-cert’d fitters
// 04

Photographed handover, every detail, in writing.

We take 60+ build photos per project — deck, VCL, insulation, every overlap, every termination — before they’re covered up. You get them on a USB at handover along with the as-built drawings, manufacturer certificates and warranty paperwork.

60+
Build photos per job
// 05

Fall design that drains, even after the deck moves.

We over-design falls (1:60 minimum, 1:80 typical) and use taper-cut insulation rather than relying on deck firrings alone. Outlets are sized for a 50-year storm event, not the 1-in-25 most contractors get away with.

1:60
Minimum fall, designed
// Recent project · 2026/Q1

Caversham Park, Reading — 1,840 m² warm-roof refurbishment.

A 1990s office block whose original mech-fix PVC had reached end-of-life. Stripped to deck, full warm-roof rebuild, edge details to current Building Regs, photographed handover.

CAV-RG/4 Two contractors installing a roofing system on a commercial building under a clear sky.

Stripped Friday, watertight Tuesday, signed off in four weeks.

Original deck had survived twenty-eight years and didn’t need replacing. New vapour barrier and taper-cut PIR brought the as-built U-value from 0.42 down to 0.16 — well past current Approved Document L minimums. Sika Sarnafil S327 mech-fix membrane terminated to a new edge trim profile, with stainless-steel disc fasteners on a 600×600 grid.

Building was occupied throughout. Zero working-hour disruption to the tenants — we worked 6:30am to 2:30pm and finished cleaning down before reception opened.

Building
Caversham Park, RG4
Programme
22 working days
Area
1,840 m²
System
Sarnafil S327-12EL
Insulation
Recticel PIR 140 mm taper
U-value
0.16 W/m²K achieved
Falls
1:60 designed in 3D
Outlets
Wade 4″ × 14
Warranty
20yr IBG + 15yr Sika
Photos
92 on the handover stick
// Coverage

The M4 corridor, within 40 miles of the yard.

We work between Bristol and Slough. For larger commercial projects we’ll travel further on an arranged basis — but our default is to stay close enough that the supervisor can be on site within an hour.

ReadingRG1–6
WokinghamRG40
BracknellRG12
HenleyRG9
NewburyRG14
BasingstokeRG21
MaidenheadSL6
SloughSL1
WindsorSL4
MarlowSL7
High WycombeHP11
OxfordOX1–4
AbingdonOX14
DidcotOX11
SwindonSN1–5
ChippenhamSN15
// Get a quote

Site visit within the week. Fixed quote within ten days.

If you’ve got drawings, send them. If you haven’t, we’ll measure on the survey. Most projects we’ll have a fully drawn-up specification and a fixed-price quote in your inbox within ten working days — quoted properly, not estimated.

Call us Get quote