pent roof

I have a small workshop from a pent shed, it's all wired up to the consumer unit and certified. However it is really to small and two low to work in. I want to build a bigger workshop around 4m x 4m. I will keep it pent and frame will be 6 x 2 C16/C24 timber. The issue I'm having is I can not...

building a 12x8 shed using SIPs and now I need advice on the pitch of a pent roof for it please