Hello All,    I suppose I should let you all know who I am. My name is Craig and I've been in the passivhaus industry now for nearly 10 years and built up my knowledge and understanding from friends, colleagues and learning about the methods and different construction methods etc. I've mainly been involved in the supply of windows and doors and Im basically the tech guy at Ecowin/Gaulhofer Windows & Doors in the UK.   I'm not here to self promote or claim we are better th