brian

Thanks for all your reply, It sounds like I'm on the right track.

Hello, I'm going building a house in the South West of Ireland with the fabric first approach. I have purchased PHPP and trying to DIY it. Is it Ok to have more Insulation in Floor and Roof than the walls? Floor = 0.108 Walls = 0.15 Roof = 0.117 Or should the U-value's be more even?