can you advise i have just move into a my new house build .1946 i have a nice size loft ideal for a converion roof cut on site out of < 4 * 2 > @ 400 centres steep pitch what i would do on first fix is bolt new 4*2 <c24> to exstin rafters to make them 4*4 put .them add new 4*2 PFC BOLTed toget...