Underlay for underfloor heating aimed at improving heat transfer and reducing impact noise beneath floating floors. Grandismo Underfloor Heating Underlay promises straightforward installation for vinyl, laminate and wood, making rooms feel warmer and quieter. Is it the right choice for a retrofit or new-build installation?
⚡ At a Glance
- • Thermal Efficiency: TOG 0.35 lowers thermal resistance so heat from underfloor systems passes through efficiently
- • Best for: Homeowners fitting LVT, vinyl, laminate or engineered wood over underfloor heating or floating subfloors
- • Not ideal for: Rooms that require specialist acoustic treatment beyond approximately 17dB of impact noise reduction
Roll covers 10m² (1m x 10m) and suits click, vinyl and laminate floors. Low TOG rating helps heat transfer while offering about 17dB of impact noise reduction.
Faster room warming – thanks to a low TOG rating
TOG 0.35 indicates a low level of thermal resistance, allowing heat to pass from the heating element through the underlay to the floor surface. Lower thermal resistance means underfloor systems reach target temperatures with less loss through the underlay.
More effective heat flow helps rooms reach comfortable temperatures sooner and supports efficient operation of underfloor heating systems.
Quieter floors – with measured impact-noise reduction
Approximate 17dB sound reduction reduces the transmission of footsteps and light impact noise across floating floors. The material compresses slightly under load to break the vibration path between floor and subfloor.
Livelier rooms feel less echoey and footsteps become less intrusive, useful for living areas, bedrooms and multi-storey homes.
Quick to lay – thanks to the 1m x 10m roll format
Supplied as a 10m² roll (1m x 10m), the underlay cuts down on joins compared with many short-strip products and suits standard room dimensions. Compatibility with click, LVT, vinyl and laminate flooring reduces the need for alternative underlays.
Single-roll coverage simplifies installation for DIYers and installers, saving time when preparing floors for floating finishes.
✨ The 4 Key Reasons for Grandismo Underfloor Heating Underlay
- Quick-roll format – Covers 10m² for faster, more efficient installation in most rooms
- Multi-surface compatibility – Works with vinyl, LVT, laminate and engineered wood floors
- Designed for heated floors – Low thermal resistance helps underfloor heating perform better
- Noticeably reduces impact noise – Helps make living spaces feel quieter and more comfortable
📋 Technical Details at a Glance
- Category: Underfloor heating underlay
- Brand: Grandismo
- Coverage: 10 m² (1m x 10m roll)
- Compatible flooring: Wood, Laminate, LVT, Vinyl, Click Floors
- TOG rating: 0.35
❓ Frequently Asked Questions
Q: Is this underlay suitable for underfloor heating?
A: Yes, the underlay is specified for underfloor heating use and has a TOG rating of 0.35, which supports efficient heat transfer.
Q: Which floor types can be used over the underlay?
A: Compatible floor types listed include wood, laminate, LVT and vinyl, and it is suitable for click-fit floating floors.
Q: Is it easy to install for DIY projects?
A: User feedback notes that the roll format is easy to lay, and the 1m x 10m size reduces joins, simplifying DIY installation.
🏆 Our Verdict
Well suited to homeowners and installers who want efficient heat transfer beneath vinyl, laminate or engineered wood while cutting impact noise. Low TOG rating and a single 10m² roll make it practical to fit under underfloor heating and floating floors. While upfront cost varies, long-term value comes from improved heating performance and quieter rooms.
