270mm insulation & raising joists for boarding (loft legs / timber on top?)

16 Sep 2013
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United Kingdom

Recently moved into 70's detached build. Current loft insulation is awful. British Gas are going to (hopefully) top-up existing to the 270mm standard.

I want to lay boards on top for storage only.

Current joists are 1.5" x 3"; with 50cm centres.

I need to add an extra ~7" of height to lay boards over top of new insulation and give a small airgap between boards and insulation.

Q1: What's the best way of achieving this?
a/ Lay full lengths of timber on top of existing joists? (Needs to be 7" in height!) (Would be getting a joiner in to do this)

b/ Use loft legs (DIY)

c/ Other?

Q2: My loft is aprox 6.5m x 5m (around 15 joists)
Any ideas of a ballpark cost for time & materials for option 1a above?
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