Amazing fast, straight forward and covers all the requirements of UK Building Regulations ISO-BLOCO ONE is the bees knees when it comes to installing new or replacement windows and doors. This video shows a typical installation into a GB double wall construction with cavity closer. "A flash of the blindingly obvious" – there is no simpler and quicker way to install windows and doors and comply with all the requirements of airtightness, thermal and acoustic insulation and weather tight to hurricane force.