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

We are currently out of stock on that item.

RRP: £7.99

Our Price: £5.99 inc VAT

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

Coronavirus Delivery Update

We are working closely with our delivery providers and can confirm all deliveries are unaffected by recent events. All orders you place on our website will continue to receive the same high standards of delivery you have come to expect from Underfloor Heating Direct.

Call us today on 0800 141 2643 to place your order.


Our delivery charges are calculated based on the weight of your entire order. Below is a table illustrating the cost for each weight bracket, please note we cap our delivery costs to a maximum of £50.

Weight From (kg) Weight To (kg) Cost
0 39.99 £10
40 59.99 £20
60 79.99 £30
80 99.99 £40
100+   £50

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 £5
  • Saturday - Additional £20

We can also arrange for pallet delivery on a three-day delivery, but costs vary depending on the size of the order, so please contact us for details.

Please Note: Wetroom Shower Trays will have 2 - 3 day delivery times and cannot be provisioned under our next day delivery policy.

When will I receive my order?

Orders placed before 3pm on any business day (Monday – Friday) excluding Bank Holidays should be delivered on the next business day (Excluding Saturday, unless the carriage is met) anytime up to 7.00pm.

Our standard next working day delivery does not guarantee next day delivery; however every effort is made by us and the courier to achieve this goal.

Orders taken on Friday after 3pm, Saturday or Sunday will be dispatched on Monday (excluding Bank Holidays) for delivery on Tuesday up to 7.00pm.

Orders placed on Friday before 3pm will be dispatched on Friday for delivery on Monday up to 7.00pm unless the Saturday delivery charge is met (This excludes Bank Holidays).

Please note: We rely upon the services of third party couriers and, whilst we endeavor to always deliver in a timely manner, there are unfortunately a few occasions when the couriers fail to deliver on the appointed day. This happens rarely, but because it does occur, albeit occasionally, we cannot be held responsible for the late delivery of an item, or any costs incurred by customers tradesman unable to work, please ensure you have your materials before booking in any trades.

Shipments sent outside the European Union may be subject to import duties and taxes, which may be levied once a shipment reaches your country. For details of Customs charges please consult your own Customs authorities for the latest rates.

Additional charges for customs clearance must be borne by you; unfortunately we have no control over these charges and cannot predict what they may be. We are unable to reimburse any costs incurred regardless of the circumstances.