Hi all,
I have just got my plans back from control with a note stating that because my window area is more than 25% of the floor area I need to suit U value calls. I know they are insulation values but how do I calculate them and what do I need value wise??
I am doing a 4*4 single story extension with a vaulted hip roof and two sky lights.
Many thanks,
Graham
I have just got my plans back from control with a note stating that because my window area is more than 25% of the floor area I need to suit U value calls. I know they are insulation values but how do I calculate them and what do I need value wise??
I am doing a 4*4 single story extension with a vaulted hip roof and two sky lights.
Many thanks,
Graham