20mm EPS 400 Overfloor Board

Lifetime guarantee included

EPS 400 20mm Overfloor Board. Suitable for Tiles – no backerboards or intermediate layers required.

Available with four options:-



From: £5.99 Exc. VAT

Aluminium Thickness
Single / Box / Half Pallet / Full Pallet Clear

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Our EPS boards offer optimal heating performance   20mm Boards use High Output 16mm Pipe. EPS400 - Approved for Tiling directly onto - without the need for a backerboard. Wunda's low profile EPS 400 Overfloor boards are 400KPa, the strongest available. Available with a choice of Plain Board, 50 Micron, 100 Micron and Rapid Response® 200 Micron aluminium. 200 microns will give optimum system performance, aluminium any thicker than 200 microns offers no performance gain and system performance will plateaux. Wunda's EPS400 Overfloor boards are lightweight, super strong, easy to fit and designed to be fitted over any existing or new floor. No specialist tools are required, they can be simply cut to shape using a fine toothed saw or craft knife. MAPEI & INSTARMAC approved for tiling directly onto - NO intermediate layers or levelling screed required! MAPEI & ULTRA approved for tiling   Suitable for Laminate, Wood, Carpet Vinyl and even TILES.

Beware when comparing Overfloor boards - although they may all look similar that is where the comparison ends. Our competitors supply EPS100 or EPS150 which is a soft packing grade material.

Quick to install using Wunda Spray contact adhesive ready for use straight away. EPS400 - Fully approved by Mapei & Instarmac for tiling directly onto.
  • EPS 400 - the strongest EPS board available (400KPA)
  • 20mm board for 16mm pipe; also available in 16mm size
  • Available as Plain, 50 Micron, 100 Micron and 200 Micron Rapid Response®
  • Mapei & Instarmac approved for tiling directly onto
  • Easy to cut to shape with basic tools
  • Eliminates the moisture, weight, mess and lengthy drying times of a screed Underfloor system
Laminate and engineered wood can be laid directly on top or tiles can be fixed to the boards using Mapei or Instarmac  approved adhesive (available from Wunda). If you wish to carpet or lay vinyl a suitable backer board will need to be laid on the Overfloor boards. Recommended maximum linear loop length of 100m.

Bulk Pricing

  • 200 Micron Rapid Response®
    • Bulk x 168 @ £8.99 each
    • Bulk x 84 @ £9.49 each
    • Single @ £9.99 each
  • 100 Micron
    • Bulk x 168 @ £7.99 each
    • Bulk x 84 @ £8.49 each
    • Single @ £8.99 each
  • 50 Micron
    • Bulk x 168 @ £6.99 each
    • Bulk x 84 @ £7.49 each
    • Single @ £7.99 each
  • Plain (No foil)
    • Bulk x 168 @ £5.99 each
    • Bulk x 84 @ £6.49 each
    • Single @ £6.99 each

Rapid Response® and maximum heat is only possible with 200 micron aluminium

Aluminium thickness in microns Board heat up speed Heat output Under Wood, Laminate or Engineered Heat output Under Carpet
200 Micron Super Fast 100w/m² 80w/m²
100 Micron Fast 60w/m² 55w/m²
50 Micron Slow 40w/m² 35w/m²
A micron is simply a measurement of thickness where 1000 microns is equal to 1mm. 200 Microns gives the best performance with Rapid Response® in all property types. Suitable for all Refurbishments and Renovations. 100 Microns is a medium foil covering offering good response in well insulated properties where rapid response is not required. 50 Microns is a thin foil covering giving slower performance and is only suitable for New Builds where rapid response is not required. Plain boards with no foil are only suitable for brand new highly insulated properties.

Please note: Output and system performance is dependent on insulation standards and environmental conditions.


Download Factsheet

Maximum Pipe Loop Length100m
Pipe Spacing150mm
pa_single-bulk1118, 1377, 1378, 1401, 1402, 1763, 1764, 1771, 1772
Material400KPA Polystyrene
Guaranteed forLIFETIME
Aluminium ThicknessPlain Board, 50 Micron, 100 Micron, 200 Micron Rapid Response®
Single / Box / Half Pallet / Full PalletSingle, Half Pallet (x84) @ £6.49 each, Full Pallet (x168) @ £5.99 each, Half Pallet (x84) @ £7.49 each, Full Pallet (x168) @ £6.99 each, Half Pallet (x84) @ £8.49 each, Full Pallet (x168) @ £7.99 each, Half Pallet (x84) @ £9.49 each, Full Pallet (x168) @ £8.99 each, Box (x12) @ £9.79 each, Box (x12) @ £8.79 each, Box (x12) @ £7.79 each, Box (x12) @ £6.79 each

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