125mm Kingspan Thermafloor TF70 delivers outstanding thermal performance as a floor insulation board, with a thermal conductivity rating of 0.022 W/mK. Suitable for both solid and suspended floor applications, this product works equally well in new builds and refurbishment schemes. The 125mm insulation boards are straightforward to cut and position, making installation efficient and straightforward. Multiple thickness options are available to match your specific project needs.
Among the most thermally effective 125mm floor insulation boards, this lightweight product offers excellent transportability and ease of installation. It integrates seamlessly with most underfloor heating systems, potentially lowering expenses associated with ground preparation and service routing.
Brand: Kingspan
Thickness: 125mm
Length: 2400mm
Width: 1200mm
Weight: 1.84kg | Thermafloor TF70 has an approximate weight of 3.50 kg/m2 at a thickness of 125 mm.
Model: 125mm Thermapitch TF70
Dimensions: 2,400mm x 1,200mm x 125mm
Compressive Strength: The compressive strength typically exceeds 140 kPa at 10% compression.
Density: 32 Kg/m3
Length: 2400mm
Material: Polyisocyanurate (Kingspan PIR Insulation)
R-Value: 5.65m2K/W
Size: 1200mm x 2400mm
Thermal Conductivity: 0.022 W/mk
Finish: 125mm TF70 is faced on both sides with a low emissivity composite foil, autohesively bonded to the insulation core during manufacture.
Applications: High performance floor insulation.
Fire Resistance: Under System 4 AVCP, 125mm Thermafloor TF70 has a Euroclass rating of F.
Water vapour resistance: 110 MNs/g
BBA Certified: Yes, No. 14/5133
Features: Improves the Thermal Resistance | Unaffected by air infiltration | Resistant to the passage of water vapour
The 125mm insulation offers versatile installation options across concrete slab floors, beam and block construction, suspended timber ground floors, and battened timber floors.
Throughout manufacture, Kingspan 125mm PIR receives a low emissivity composite foil facing on both surfaces. This reflective layer boosts thermal resistance in any unventilated cavity space adjacent to the board.
125mm Kingspan Thermafloor TF70 employs Nilflam® technology, a premium fiber-free rigid thermoset polyisocyanurate (PIR) material. Production utilises a blowing agent with zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP).
When assessed under BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior), 125mm Kingspan PIR insulation typically achieves compressive strength exceeding 150 kPa at 10% compression.
Testing to BS EN 12086:2013 (Thermal insulating products for building applications. Determination of water vapor transmission properties) demonstrates this product typically delivers resistance well above 100 MNs/g.
Longevity of 125mm TF70 Floor Insulation depends on correct installation, adequate structural support, and appropriate usage conditions. With proper installation, the product can perform reliably for many years.
125mm Kingspan Insulation TF70 achieves an F Euroclass rating under System 4 AVCP. When installed in pitched roof applications beneath appropriate roof covering, it meets national standards for external fire exposure.
Browse our full Kingspan range and narrow results by thickness or coverage using the filters on the left. For project-specific advice or bulk pricing enquiries, contact us on +4402038839057, email sales@insulationbee or use Live Chat - Lowest UK Insulation Prices.














