AKW Tuff Form8 Buyer's Guide: Sizes, Waste Options & Installation Explained

The AKW Tuff Form8 is the UK's most flexible level-access wet floor former — the successor to the original Tuff Form, which alone has clocked up over half a million installations. If you're planning a wet room on a timber or concrete floor and want a former that fits around your joists rather than forcing you to fight them, this guide covers everything: how the rotating waste plate works, every size AKW make, which waste option suits your floor, and how it compares with the other AKW formers.

What Is the AKW Tuff Form8?

The Tuff Form8 is a 22mm-thick wet floor former made from compression-moulded SMC-GRP (Sheet Moulding Compound – Glass Reinforced Plastic). It sits within your floor build-up to create a completely level-access showering area, finished with either vinyl safety flooring or tiles (with a tanking kit). Despite being light enough for one person to handle, it supports up to 60 stone (381kg) on timber joists — with unlimited support on concrete — and carries AKW's lifetime warranty. It's UKCA, CE and BS EN 14527 approved.

The Rotating Waste Plate: Up to 25 Waste Positions

The headline feature is the octagonal rotating drain plate. Each 45° turn moves the waste outlet to a new position, which means:

• Rectangular formers offer 15 waste positions — eight from rotating the plate, plus another set from rotating the whole former 180°.
• Square formers (900x900, 1000x1000, 1200x1200) offer up to 25 unique positions, because the former itself can be rotated 90° three times.

In practice, that means the Tuff Form8 fits every UK joist pattern without notching or moving a single joist — and it's the reason installers love it. It also allows the increasingly popular central waste position for design-led wet rooms, with the octagonal plate maintaining a continuous 1:16 fall to the waste so water never pools.

Tuff Form8 Sizes and Product Codes

AKW make nine sizes, from compact 900x900mm squares to a generous 1800x820mm walk-through:

None of the sizes quite right? Every Tuff Form8 can be trimmed to within 150mm of the octagonal plate with standard tools, so custom sizes for alcoves and awkward rooms are easy — just remember cut edges must go against a wall and be fully supported.

Which Waste Option Do I Need?

The former is supplied without a waste, and choosing the right one comes down to two questions: what's your floor finish (vinyl or tiles), and can gravity drainage physically run from the waste to your soil pipe?

Vinyl Safety Flooring (Gravity)

• GW50 with Tuff Form Adaptor (25124) — the standard choice: a 50mm water-seal trapped waste for most installs.
• GW19 with Tuff Form Adaptor (25129) — a 19mm shallow trap for tight floor voids.
• TF75 One-Part Waste (25106) — clamping design for the fastest possible fit.
• TF75 Bottom Outlet (25408) — for straight-down vertical pipe runs.
• CTW01 Gravity Shower Trap (08CTW01) — an economical trapped option.
• McAlpine TSG52 Gully (08GT52NSC) — a premium two-piece 50mm water-seal gully.
• GW90-2 Low Height Dry (25419-UK) / Wet (25499-UK) — low-height wastes with TF vinyl adaptors for the shallowest voids.

Tiled Floors (Gravity)

• DW90 Low Depth Dry Waste (25418-UK) — with tiled-floor adaptor, ideal for shallow voids.
• TF75 Tiled (LB00101) — one-part waste with a stainless tile-ready grate.
• GW90-2 Low Height Wet (25498-UK) — with TF tiled-floor adaptor.

No Fall Available? Go Pumped

• Silentflow+ PGTF 22mm (25414) — a quiet pumped waste for concrete floors, flats and any install where gravity simply can't run.

All twelve options — and the former-only route — can be configured directly on our AKW Tuff Form8 Wet Floor Former (All Sizes) listing, with every size and waste combination priced individually.

Installation Highlights

A few points from AKW's official fitting instructions worth knowing before you order:

• Timber floors: support all four edges with a bearer every 350–400mm, and add noggins within 110mm of the waste centre. When routing pipe through joists, drill a hole — never cut a notch.
• Concrete/screed floors: the ribbed underside keys into the screed bed and eliminates slippage or float during installation.
• No underboarding needed, and the removable plate gives easy access for pipework.
• Underfloor heating: fully compatible — just allow a slightly deeper recess for the heating elements.
• Tiled finishes need a waterproofing membrane sealing the former-to-wall interface — see AKW's FormSafe tanking kits.

Tuff Form8 vs Tuff Form, TriForm and ShowerDec

AKW make four wet floor formers, and each earns its place:

• Tuff Form8 — the flexibility champion: up to 25 waste positions, 60st capacity, nine sizes. The default choice for most installs, especially where joists are awkward.
• Tuff Form (original) — the proven classic with an offset fixed waste position; over half a million installed.
• TriForm — the designer option: a linear gulley waste draining up to 78 litres per minute through up to three outlets, with reversible tile-in or brushed stainless covers. See our AKW TriForm (All Sizes).
• ShowerDec — the strength champion: 24mm thick with a 100 stone (635kg) capacity, the highest in the range. See the AKW Contour ShowerDec (All Sizes) or read our ShowerDec buyer's guide.

Frequently Asked Questions

Can the Tuff Form8 be cut to size?

Yes — any side can be trimmed to within 150mm of the octagonal drain plate using a circular saw or jigsaw, letting you create custom sizes. Cut edges must sit against a wall and be fully supported.

Does the Tuff Form8 work with underfloor heating?

Yes, electric underfloor heating can be installed on top of the former — allow a slightly deeper floor recess for the elements.

Can I tile over a Tuff Form8?

Yes. It takes both tiles (with a tanking membrane) and vinyl safety flooring, and there are dedicated tiled-floor waste options with stainless tile-ready grates.

What's the weight capacity?

Up to 60 stone (381kg) on timber joists, and unlimited on properly screeded concrete floors.

Is a waste included?

The former is supplied without a waste so you can choose the right one for your floor — our listing offers twelve genuine AKW-supplied waste options across vinyl, tiled and pumped installs, or the former alone.

Ready to Order?

Configure your size and waste on the AKW Tuff Form8 Wet Floor Former (All Sizes) — with next working day delivery available. Then complete the wet room with a screen: read our complete guide to AKW wet floor shower screens, or jump straight to the Silverdale toughened glass range or standard PET screens.