ThermalSheet Insulating Underlayment (2’ x 3’) - 6 Sq. Ft. - 1 Sheet
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Notices
Quebec Repairability Notice
Avis important pour les consommateurs du Québec:
WarmlyYours n’offre pas de services de réparation pour ce produit. Les seules pièces de rechange disponibles sont les kits de raccordement (splice kits) ; l’élément chauffant lui-même n’est pas offert comme pièce de rechange. Si votre système de chauffage par le sol intérieur tombe en panne pendant la période de garantie, nous remplacerons l’unité complète conformément à notre politique de garantie. Notre équipe d’assistance technique est disponible 24h/24 et 7j/7 par téléphone pour toute aide à l’installation ou au dépannage. Pour plus de détails, consultez notre politique de retour. Cet avis est fourni conformément à la Loi sur la protection du consommateur du Québec, article 39 (telle qu’amendée en 2025).
Important Notice for Québec Consumers:
WarmlyYours does not provide repair services for this product. The only replacement parts available are splice kits; the heating element itself is not available as a replacement part. If your indoor floor heating system fails within the warranty period, we will replace the entire unit according to our warranty policy. Our technical support team is available 24/7 by phone for installation and troubleshooting assistance. For full details, see our Return Policy. This notice is provided in accordance with Québec’s Consumer Protection Act, section 39 (as amended in 2025).
Support Questions
Showing all 6 questions
No, for the installation of an Environ heating system with a floating floor like laminate, it is not necessary to adhere the ThermalSheet underlayment to the subfloor. The underlayment should instead be allowed to float freely on the subfloor. Make sure to stagger adjacent sheets of underlayment and tape them together to prevent any overlaps, ensuring a flat and even layer beneath your flooring. This method helps accommodate the natural expansion and contraction of the floating floor.
ThermalSheet Insulating Underlayment is a synthetic cork, a lightweight thermal barrier made of hemi-crystalline thermoplastic.
WarmlyYours recommends ThermalSheet underlayment when installing a floor heating system over a concrete slab to prevent heat loss and protect against moisture. It will not rot, support mold and mildew, or absorb moisture.
- ThermalSheet synthetic cork underlayment (6mm) has a 1.5 R-value, crack isolation up to 1/4“, reduces sound by up to 22 dB, and is Robinson tested (TCNA) and rated for residential loads.
- Cork (6mm) has a .72 R-value, crack isolation up to 1/32“, reduces sound by up to 23 dB, and is Robinson tested (TCNA) and rated for residential loads.
Documents
Technical Information
Installation
- ThermalSheet Insulating Underlayment Installation Instructions (English)
- ThermalSheet Insulating Underlayment Installation Instructions (Spanish)
Sell Sheets
Specifications
Insulation Specification
| Acoustic testing on 6" slab, no ceiling | IIC 52 wood construction. FIIC 59 - 7.5″ concrete slab. ΔIIC 20 - 6″ concrete slab |
| Compressive Strength | 41 psi at 25% strain, 54 psi at 50% strain, and 110 psi at 75% strain |
| Material | Expanded Polypropylene (EPP) |
| Thermal Insulation | 1.5 R-Value |
Product Dimensions
| Coverage | 6 ft² |
| Depth | 0.2362″ |
| Length | 36″ |
| Weight | 0.4 lbs |
| Width | 24″ |
Identifiers
| SKU | TS-SH6MM-24x36 |
| UPC (GTIN-12) | 881308077037 |
Warranty / Certifications
| TCNA Robinson test | Residential |
| Warranty | 5 years |