DIY Doctor UK DIY Forums

Having been saved from making the mistake of creating an occasional room in my attick I have decided to just board it out for storage. I would like to do it myself to save pennies. I have got three questions.
1. I need to re-enforce the floor / first floor ceiling. Will I be ok to screw extra timbers on top of the joists (i.e. Screwing 4*2 timbers on top of the 3*2 existing ones) or is it better to run full depth beams (assume 7*2inch)adjacent to the old ones but keep them independant?
2. Thinking about insulation under the new attick floor. I'm guessing that 150 mm of rockwool is a bit thin for insulating the house so would I be right in saying that i need to splash out on some insulating boards (e.g. kingspan)? If there is a more cost effective product it would be really good to know about it.
3. I want the storage space to feel easily accessable as there is very little storage in the rest of the house. From what I have read I cant put boards under the eves but is there something I can put up to make the space look better and be less draughty and cleaner than just having the tiles?

3x2 on top of existing ceiling joists does not strengthen, lay 7x2 alongside and bolt through, that strengthens. kingspan is very expensive for a boarded out storage area. 150mm fibre glass is perfectly ok, as you appear to be aiming for a 175mm void, and to make the roof area look cleaner, try fibre board, lightweight, and does give a degree of insulation too.

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