Can underfloor insulation cause damp?

Only if installed incorrectly. Always pair underfloor insulation with proper damp-proofing and adequate ventilation to prevent moisture buildup. When fitted as recommended, underfloor insulation keeps your floors warm without causing damp issues.

How to install underfloor insulation?

For timber floors, fix the panels tightly between joists. For concrete or solid floors, lay the boards over the surface or under a screed. The insulation should be flush, with no gaps. Include any required damp-proof membranes as specified by Building Regulations.

What is underfloor insulation?

This is an insulation material specially designed for installation under floors. It is effective in reducing draughts and minimising heat loss. The specific underfloor insulation slab to use depends on the type of floor.

Which underfloor insulation is best?

The best underfloor insulation depends on your floor structure and project goals because what works for one floor may not suit another. For example, mineral wool boards work best on timber floors, and rigid insulation boards work great on concrete floors. So always consider the floor type first.

Underfloor Insulation at Low Wholesale Prices

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Products in Underfloor Insulation

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90mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 24 (69.12m2)

90mm Unilin Thin-R PIR insulation is a foil faced, high-performance insulation solution that offers exceptional thermal efficiency and durability. This polyisocyanurate insulation board, formerly known as Xtratherm, is ideal for a range of applications, such as floors, pitched roofs, and walls.

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125mm Mannok PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

125mm Mannok PIR Insulation Board is an excellent choice for anyone looking for a high-performance insulation solution that provides superior thermal efficiency. It is ideal for use in any construction project, such as commercial and residential, in wall applications as well as roofing and flooring applications.

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110mm Celotex XR4110 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

110mm Celotex XR4110 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£49.34£59.21 Ex VATInc VAT
£17.13£20.56 Per M2 Get restock alert
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130mm Celotex XR4130 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

130mm Celotex XR4130 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£63.64£76.37 Ex VATInc VAT
£22.10£26.52 Per M2 Get restock alert
130mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

130mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.

£56.17£67.40 Ex VATInc VAT
£19.50£23.40 Per M2 Get restock alert
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20mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 15 (43.20m2)
All three models 20mm Kingspan Therma PIR Insulation Board:
- 20mm Thermapitch TP10
- 20mm Thermafloor TF70
- 20mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.

No longer in production.
£326.73£392.08 Ex VATInc VAT
£7.56£9.07 Per M2 Get restock alert