Warmup Insulated Underlay

Code: WIU
  • From £30.60 (inc. VAT)
  • (FREE UK Delivery)
Available   |   Usually dispatched within 24 hours

Warmup Insulated Underlay - Available In Different Sizes

A thin polystyrene insulation barrier with effective acoustic properties to reduce contact noise.

It sits between the cold subfloor and foil heater reflecting heat upwards, making the underfloor heating system more efficient and effective. The foil backing acts as an effective moisture barrier. The Insulated Underlay has been specially developed for installation under the Dual Overlay as part of a complete stable system.

It is the ideal duo combination for installation of soft and resilient floor coverings such as carpet and vinyl, under foil underfloor heating.


Roll Size 1200mm(W); 2.5sqm, 5sqm, 10sqm and 25sqm (L)

Thickness 6mm

Composition Top Layer: Grooved polystyrene

Bottom Layer: Silver foil with adhesive overlap

R Value 0.19 m��K/W

Contact Sound Reduction 25dB  �������Lw when used in conjunction with the Warmup Dual Overlay System

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Many of our items have free delivery and where next day delivery is shown we will endeavor to achieve this, as long as the order is placed before 1pm, is within the UK mainland and subject to stock availability 

We will email you an estimated delivery date on receipt of your order and on the day of delivery endeavour to send you the carrier’s details.

Unfortunately, we currently do not deliver to addresses outside the United Kingdom, but you can arrange for a courier to collect from our premises.

Medium and large items incur a delivery charge. If more than one medium or large items are ordered only one delivery charge will be applied. This will be displayed in the basket during checkout. Medium items are £17 and large items are £30 including VAT. The delivery charge for the largest products - eg wall panels and worktops - is £59.99.

We want all our customers to be happy with their purchases. Returns may be made within 14 days of delivery for unwanted goods or 30 days for faulty/damaged goods.

Please either email us at sales@plumb-warehouse.co.uk or click on the link below for a returns form.

Please ensure that the goods returned are intact, unused and in the original packaging.

Returns Cancellation Form

For our full Delivery & Returns - please see here.

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Claydon House Business Centre

1 Edison Rd



HP19 8TE