Aluminium Spreader Plate 390mm x 1000mm - 3 Groove (133mm Centres)

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RRP: £7.99

Our Price: £5.49 inc VAT

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Product Details

Product Details

Aluminium spreader plates are used with water underfloor heating systems for laying across floor joists. The items have measurements of 390mm X 1000mm X 0.5mm, with a groove depth of 16mm.

The diffuser plates are designed to be used with floor joists with centres of 400mm. The aluminium spreader plates can also be fastened down to joists with the aid of a hand stapler, making installation even simpler.

The void below the plates is filled with insulation to prevent heat from being lost into this space. This can also help to spread warmth evenly across the floor above. The multi-layered barrier pipes are fitted into the grooves, or channels, of the plates, which have been produced for use with piping measuring 15mm or 16mm in diameter.

Underfloor Heating Direct


When installing the spreader plates, allow a minimum of 250mm from the walls to allow for the bend and return of the fixtures in the other direction. The aluminium items should be secured as you work along the space using screws, nails or a stapler, which should lie flush with the spreader plate's surface.

Before securing the second plate, remember to leave a gap of 10mm, which allows room for any expansion. To make sure that the spreader plates are aligned correctly, place a small piece of pipe into the meeting channels of the items, before finally securing. Don't remove the length of pipe from the channels until the spreader plate is firmly secured.

The metal plates should not overlap at any stage, as this could result in a noise being produced as they heat up to reach the selected temperature, or when they cool down. These items are made of high-grade aluminium, which is light weight and designed to be used with wooden joists.



This high grade aluminium plate is designed for use with 15mm or 16mm pipework.

  • Width: 390mm (0.39m)
  • Length: 1000mm (1.0m)
  • Depth: 0.5mm
  • Weight: 0.56kg / 22.4kg for a box of 40
  • Groove spacings: 133mm centres
  • Total floor coverage: 0.39m2
  • The high grade aluminium creates an even spread of heat across the floor
  • Designed for wooden joists @ 400mm centres.
  • Light weight
  • Quick installation


Our delivery charges are calculated based on the weight of your entire order. Below is a table illustrating the cost for each weight bracket.

Weight From (kg) Weight To (kg) Cost
0 19.99 £0
20 39.99 £5
40 59.99 £10
60 79.99 £15
80 99.99 £20
100+   £25

Please note all orders under £20.00 will incur a £5.00 delivery charge.

In addition to our standard delivery service, we can also arrange for delivery on a Saturday or before 10.30am on any working day. This level of carriage comes at an additional cost:

  • Next working day before 10.30am - Additional £9.99
  • Saturday - Additional £24.99

When will I receive my order?

All efforts are made to ensure your qualifying order reaches you on the next available working day before 7.00pm, as long as you place your order with us by 4pm (Monday to Friday).

All orders received after 4pm on a Friday (including weekend orders) will be despatched on Monday for a Tuesday delivery. Bank holidays are treated in the same way as a non-working day.

Please note that we cannot guarantee delivery at a certain time and occasionally, circumstances beyond our control or that of the courier’s may mean your delivery is delayed. Though a rare occurrence, sometimes a delivery arrives late, meaning that tradesman are unable to continue with a project.

We cannot be held responsible for any costs incurred as a result of a delayed delivery, and we would always recommend that customers ensure the materials required by their contractors are on site prior to the commencement of any work. We take pride in the prompt despatch of our products, but we do rely on third-party couriers to deliver on our behalf. There are occasions when traffic, weather or unusual events can cause delays.

If your product has been delayed, we will do our best to keep you informed using our tracking service, and advise you of any estimated time and date of your delivery.