Advice for insulating and boarding old bungalow loft (2x4 joists)

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Hi there.

I am thinking of properly doing my loft up (at last) but would be really grateful for some initial advice.

It is a 1930s bungalow with 2x4 joists.

There are patchy bits of fibreglass in areas and other parts filled with vermiculite - there are various bits of boards in parts and areas which are just bare.

I am thinking of just putting down fresh fibreglass everywhere and then putting some interlocking chipboard loftboards over the top.

The current regulations seem to suggest that 270mm is the norm, which is not really going to be an option for me.

Further, you apparently need a 50mm airgap between the top of the insulation and the top of the loft board.

Any advice on what to do would be much appreciated.

My initial thought is to run some (2x2, or even 2x2) timbers perpendicular to the current joists and just put some 100mm insulation down - seems the best I can do, but allows the airgap as well. Can then fix the loftboard to the new timber on top.
 
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