A fast, clip-free way to lay warm-water heating pipe across new screeded floors.
AD-TRAY uses recycled-plastic castellated panels to hold 16mm heating pipe at consistent 200mm centres. The pipe presses between the raised castellations, giving installers a clear, repeatable layout before the screed is poured.
Plan the panels, pipe circuits and screed as one floor construction. Follow the project design and current installation instructions through each stage.
1Confirm the heat loss, flow temperature, manifold position, circuit lengths and screed specification.
2Prepare the structural base and install the specified rigid floor insulation and perimeter edge insulation.
3Fit any vapour-control layer or membrane required by the floor design.
4Lay the AD-TRAY panels across the heated area, cutting neatly around walls, openings and fixed obstacles.
5Press the pipe between the castellations at the designed 200mm centres and connect each circuit to the manifold.
6Fill, flush and pressure-test the complete system before it is covered.
7Lay and cure the specified screed, then commission the heating gradually in line with current instructions.
Working with the castellated panel
How the Tray Guides the Pipe
The raised castellations create a repeatable route for straight runs, smooth returns and neat transitions between rooms.
Use the castellated pattern to keep long pipe runs straight and evenly spaced.
Form smooth return bends without kinking the multilayer pipe.
Cut panels to suit room edges and obstacles while keeping the circuit route accessible.
Inspect and photograph every circuit before the screed is installed.
Plan the complete installation
Where AD-TRAY Works Best
Consider AD-TRAY where the project includes rigid floor insulation and a new screed. The cuttable panels work especially well across larger floor areas and around changes in room shape.
New builds and extensions with a new screeded floor.
Major renovations where the solid floor is being rebuilt.
Suitable solid or beam-and-block floor constructions.
Open-plan and irregular rooms where cuttable panels simplify setting out.
Typical AD-TRAY Floor Build-Up
From the structural floor upwards, a typical arrangement includes the layers below. The exact specification must follow the project design.
1Prepared structural floor
2Specified damp-proofing or membrane, where required
3Rigid floor insulation with perimeter edge insulation
4AD-TRAY panels with 16mm heating pipe
5Specified pumped or sand-and-cement screed
6Compatible final floor finish and preparation layers
16mm
PERT-AL-PERT heating pipe
200mm
Designed pipe centres
≈1m²
Coverage per full tray
100%
Recycled high-impact plastic
Real AD-TRAY installation
See the System Before the Screed Goes Down
These installation photographs show how the trays guide long runs, return bends, room edges and transitions across a real renovation project.
Whole-Room Coverage
Castellated panels create a continuous fixing surface across open-plan spaces and room transitions.
Controlled Return Bends
The panel pattern helps keep repeated turns smooth, tidy and easy to inspect before screeding.
Neat Edge Details
Panels can be cut to follow walls and fixed features while preserving the planned circuit route.
Flexible Room Planning
The same press-fit layout works in compact rooms as well as larger connected floor areas.
AD-TRAY project advice
Frequently Asked Questions
Clear answers about panels, pipe spacing, insulation, screed and planning an AD-TRAY installation.
What is the AD-TRAY system?
AD-TRAY is an in-screed warm-water underfloor heating system. Recycled-plastic castellated panels retain 16mm PERT-AL-PERT pipe at consistent 200mm centres over suitable rigid insulation before the screed is installed.
Does AD-TRAY replace the floor insulation?
No. The trays position and secure the heating pipe; they are installed over the rigid floor insulation specified for the building and floor construction.
What pipe spacing does AD-TRAY use?
The current kit is designed around 200mm pipe centres. The final circuit layout and flow temperature must be checked against the room-by-room heat-loss design.
What screed depth is required?
Current guidance uses a typical minimum of 50mm for a suitable pumped screed or 65mm for a sand-and-cement screed. The screed manufacturer and project designer must confirm the actual depth and complete construction.
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Can AD-TRAY be used on beam-and-block floors?
Yes, it can be used within a correctly designed beam-and-block floor build-up that includes the specified preparation, insulation, membranes where required and screed.
Can the trays be cut around obstacles?
Yes. The lightweight panels can be cut to suit room edges, openings and fixed obstacles. Keep the pipe route and minimum bend radius in mind when planning each cut.
Which floor finishes work with AD-TRAY?
Tiles, suitable engineered wood, vinyl and carpet can all be considered over the completed screed. Follow the floor-finish, adhesive and screed manufacturers’ requirements, including any preparation layer, underlay and temperature limits.
How do I choose the correct AD-TRAY kit?
Start with the usable heated floor area, excluding fixed furniture, kitchen units, baths and other areas where pipe will not be installed. Then check the room layout, circuit design, manifold position and zoning.
