Our Classic Underlay Insulation boards are a cost effective solution for use under Fastwarm® underwood & undercarpet foil heating system. Providing high quality insulation whilst supporting as an underlay.
Classic Underlay is also a perfect choice for use under a laminate & engineered floating floor finishes when underfloor heating hasn't been chosen.
Fastwarm® Classic Underlay Insulation is supplied in 10.2m2 sealed packs containing 20 individual sheets at 850mm x 600mm with each board covering 0.51m2 (Classic Underlay is only provided at a 6mm thickness, if you require a deeper depth of insulation then please refer to our XPS Insulation which comes in a multitude of thicknesses).
Please Note: Classic Underlay cannot be used with electric undertile heating mats & cables or covered with a levelling compound, they are strictly for use with a foil heating mats.
|Board Dimension||850mm x 600mm|
|Material Type||Expanded Polystrene|
|Thermal Conductivity||0.034 W/mk|
|Material Density||32 KG/m3|
|Load Strength||10 t/m2|
|Moisture Absorption||< 0.1 vol%|
|Sound Impact Rating||20db|
|Euroclass Fire Rating||C Euroclass|
Free Delivery as Standard!
As standard we include 2 - 3 working day delivery on all orders delivered to the UK mainland. * A £5 delivery charge will be applied to all orders below £20.
Delivery cut off times
Our final delivery time for Mondays to Thursday is 4:30pm. To give us a bit more time to ensure weekend deliveries are handled and our couriers have time to collect, the final delivery time on Fridays is 4:00pm.
Please note - there may be delivery disruptions from Thurs 24th Nov to Thurs 1st Dec due to planned courier strikes.
2-3 working day delivery
Next working day
Next working day before 10:30
* A £5 delivery charge will be applied to all orders below £20.
Other Delivery Options
Pre 10:30am and Saturday delivery services are available on orders placed before 4:30pm. Any order placed before 4:30pm on a Friday will be delivered on the following Monday (unless its a bank holiday) so please select a Saturday service if a weekend delivery is required.
Delivery outside the UK
Delivery outside the mainland UK may be arranged by prior agreement. You will be notified of the amount of the charge for this service and will at that point have to make a decision whether you wish to proceed wth your order.
Important: Our deliveries rely on third party couriers, so, whilst we make every effort to deliver your order on the specified date and time, unfortunately there may be occasions when this will not be possible due to external influences. Due to this we strongly recommend you ensure you have received your order before any tradespeople/builders are scheduled to commence work.