new video low resHouse builders and window installers can now take advantage of a step-by-step instruction video to install ISO-Chemie’s ISO-BLOCO One multi-purpose foam sealing tape.

The three-minute video with accompanying voiceover instruction can be viewed at It shows installation of a standard PVC double-glazed window in a double skin wall with cavity closures, using ISO-BLOCO One as the window sealant.

The demonstration also includes handy hints and tips such as creating a small lip of tape at the corner of the window unit to allow for expansion into the window apex and pre-drilling the window unit with the tape in place before installation.

ISO-BLOCO One tape, which comes with a 10 year performance guarantee and provides up to 70% cost savings when compared to other three component systems, enables windows and doors to be quickly and easily sealed from inside the building. This avoids the need to use time consuming and costly external access systems like scaffolding and ladders, and provides guaranteed high performance sealing for the lifetime of the window.

Installation of the foam sealant can be can be undertaken regardless of external weather conditions, avoiding time consuming and costly delays.
ISO-BLOCO One offers a single product ‘fit and forget’ solution for fast and effective sealing based on the European RAL principles of three level sealing – the inside seal area is more airtight than the external one, allowing any trapped moisture inside the joint, or within the wall, to escape outwards rather than into the building.

Quick and easy-to-apply, the self-adhesive ISO-BLOCO One provides a high performance seal for window and door joints up to 30mm wide and is impermeable to driving rain at a minimum of 1,000 Pa – 66% higher reliability than most conventional joint sealing tapes.

The external seal area provides weather resistance and breathability, while the intermediate seal area provides extra thermal and acoustic properties and the internal one air tightness and humidity regulation. All three levels are designed to accommodate movement between the adjacent materials.
The internal air tight seal has been tested at 1000 Pa pressure difference (20 times more than UK Building Regulations.) and found to give less than 0.01 m³ of air loss. At the same time, depending on tape width, it will also supply a U-Value of 0.55 and reduce sound by 45 dB, straight from the box.
The product is suitable both for refurbishment and new build. Due to the guaranteed performance characteristics for each size tape, ISO-BLOCO One fills the “Performance Gap” between ‘as designed’ and ‘as built’ products, highlighted in the recent Zero Carbon Hub reports.

ISO BLOCO One complies with all the relevant UK Building Regulations, the European energy saving regulations (EnEV) on windows and doors as well as the RAL quality assurance association and is able to accommodate extremes of temperature changes, from – 30°C to + 80°C.