





GreenStuf® Thermal Underfloor Blanket
Thermal insulation blanket that reduces heat loss through floors.
GreenStuf® Thermal Underfloor Insulation Blanket is designed to insulate residential and commercial spaces with exposed joist floors in new and existing homes.
GREENSTUF® THERMAL UNDERFLOOR BLANKET
Product Name | R-Value | Thickness | Standard Width | Type | Nominal grams per m2 (GSM) | Nominal Density (kg/m3) | |
---|---|---|---|---|---|---|---|
Thermal Underfloor Blanket | ✔ | R1.5 | 100mm | 450 / 500 / 550 / 600 / 650mm | Roll | 750 | 7.5 |
Thermal Underfloor Blanket | ✔ | R1.8 | 100mm | 450 / 500 / 550 / 600 / 650mm | Roll | 1025 | 10.3 |
Thermal Underfloor Blanket | R2.0 | 115mm | 450 / 500 / 550 / 600 / 650mm | Roll | 1150 | 10 | |
Thermal Underfloor Blanket | ✔ | R2.6 | 140mm | 500 / 600mm | Roll | 1650 | 11.8 |
Thermal Underfloor Blanket | ✔ | R2.9 | 140mm | 380 / 500 / 580 / 600mm | Roll | 1850 | 13.2 |
Thermal Underfloor Blanket | R3.4 | 140mm | 500mm | Roll | 2850 | 20.4 |
- No need to cut or trim to fit, simply staple into place between the joists.
- Available in a wide range of pre-cut rolls to fit standard exposed timber joist floors.
- Reduces heat loss through floors and drafts caused by gaps in the floorboards.
- Thermally bonded without harmful chemicals
- Safe and easy to install without PPE
- Made locally in New Zealand
Data Sheets
Install Instructions
Warranties & Manufacturers Guarantee
Brochures & Product List





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GreenStuf® 100% polyester insulation doesn’t just comply with strict building standards, it’s also non-toxic and safe to touch without PPE—ensuring a hazard and itch-free installation.
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