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Frequently Asked Questions
Answers to common questions about SOPREMA Korea products.
Product
What is the difference between TECSOUND and ordinary soundproofing materials?
TECSOUND is a high-density synthetic acoustic membrane at 2,010 kg/m³ — 2–3× denser than ordinary materials (400–800 kg/m³). Per the mass law, higher density means better insulation even at a thin profile (1.75–5 mm). Sound reduction (Rw) is defined by the assembled system, not the membrane alone — e.g. a double-plasterboard partition with TECSOUND SY reaches about Rw 55 dB. It is also bitumen-free, odourless and environmentally friendly.
Product
What is the difference between TECSOUND SY and standard TECSOUND?
TECSOUND SY adds a self-adhesive layer. Peel off the release liner and apply directly — no separate adhesive needed, greatly reducing installation time. It bonds directly to plasterboard, plywood, metal sheet and other surfaces.
Product
What is VELAPHONE (TEXFON)?
VELAPHONE (TEXFON) reduces floor impact noise (footsteps, dropped objects, etc.). Laid over a concrete slab with a floating screed poured on top, it effectively blocks impact noise from transmitting to the floor below, providing ΔLw 22 dB of impact-noise reduction.
Installation
How should the surface be prepared for TECSOUND SY?
Clean off dust, oil and debris from the bonding surface and keep it dry. A wet surface or condensation reduces adhesion. For concrete, install only after full curing (minimum 28 days).
Installation
Why is TECSOUND BAND needed when installing VELAPHONE?
TECSOUND BAND blocks the acoustic bridge between the floating screed and the wall. If the floating floor contacts the wall directly, impact noise transmits through the wall structure and sharply reduces performance. Always install TECSOUND BAND around the perimeter before pouring the screed.
Installation
How are TECSOUND joints treated?
All TECSOUND joints must be sealed with the dedicated aluminium tape. Sound leaking through joint gaps significantly degrades overall performance. Overlap joints by at least 5 cm and seal them completely with tape.
Order
Is there a minimum order quantity?
The minimum order quantity varies by product. Products are generally available by the roll; for small quantities please contact us. We provide exact quantities and pricing with your quote.
Order
How does delivery work?
Delivery takes 3–5 business days after order confirmation. Shipping cost depends on order quantity and delivery region and is included in the quote. Direct-to-site delivery is available for large orders.
Order
Can I receive a sample?
Yes, we provide free product samples. Select 'Sample request' in the inquiry form or contact us by phone. We recommend confirming suitability for your project after receiving the sample before ordering.
Technical
What is Rw (weighted sound reduction index)?
Rw is a single-number rating of airborne sound insulation, measured per ISO 717-1; the higher the better. Rw is normally quoted for an assembled wall/floor system rather than a lining alone — e.g. a double-plasterboard partition with TECSOUND SY reaches about Rw 55 dB.
Technical
What is ΔLw (weighted impact sound reduction)?
ΔLw indicates the performance of a floor impact-noise underlay, measured per ISO 717-2; the higher the number, the better. VELAPHONE (TEXFON) is ΔLw 22 dB, reducing impact noise by about 22 dB.
Technical
Is TECSOUND fire-certified?
Yes. TECSOUND membranes hold a Euroclass B-s2, d0 reaction-to-fire classification (self-extinguishing), meaning they resist burning, produce little smoke and do not release flaming droplets. It meets the fire requirements of building regulations.