The underlay for a superior acoustic comfort between floors
insulit Bi+8 is an acoustic underlay designed to limit the transmission of impact and airborne noise between floors. Building on the success of the insulit Bi+7, we wanted to obtain with its successor, the insulit Bi+8, an even easier installation of the product. We also wanted to develop a much more resistant product with an improved acoustic performance.
This new product belongs to our premium range. Recent tests carried out by the BBRI according to EN ISO 717-2 are proving its outstanding performance. If installed on a concrete slab, under a floating screed of ± 6 cm thickness, it is possible to measure a ∆Lw of 28 dB! To achieve even better results, we recommend using a thermal levelling screed.
Foam + felt: unique acoustic performances!
insulit Bi+ 8 is made of an embossed, physically crosslinked polyolefine foam (thickness ≥ 3,5 mm) with closed micro cells, combined to an acoustic felt with a low dynamic stiffness (thickness ≥ 5 mm). A bi-component underlay is far more efficient than a single layer acoustic solution: the foam and the felt altogether are able to cover a much larger frequency range, where the felt absorbs low frequencies and the foam absorbs medium and high frequencies.
- Reduction of impact & airborne noises
- In rolls, quick and easy installation
- Highly efficient
- Tape provided to maintain the overlaps
- Physically crosslinked polyolefin: guaranteed longevity
- Closed microcells
- Thin, light and flexible
- Low dynamic stiffness = better acoustic performance
- Low creep
- Recent BBRI reports = guaranteed good results
Physically crosslinked polyolefin
≥ 8,5 mm under 1,5 kPa
Orange (foam) / Anthracite (felt)
Impact noises insulation:
ΔLw = 28 dB on a bare slab with no pre-screed
s’t = 8 MN/m³ (EN 29052-1)
50 – 50 N (EN 12310-1)
≤10 % under 2 kPa (tolerance 10%)
R = 0,26 m²·K/W (EN 12667:2002)
λ = 0,0356 W/m·K at 10°C (foam) (EN 12667:2002)
30 m x 1,50 m = 45 m²
±320 g/m² (15 kg per roll)
Junction is made with an included kraft tape