Your opinions on my floor dilemma

[Russtavo]

I've had a chimney breast and hearth removed, resulting in what you can see on my uploaded pic. I'd like Quick-step laminate fitted on top of floorboards, but need to sort this bit of floor out and not really sure what to do, appreciate your opinions

Obviously I can fit 2 small pieces of floorboard to the exposed joists, leaving small voids either side - what to fill with? Celotex insulation board? That would leave the (uneven) concete base - I really don't know whether I should be smashing this up or levelling with compound

It doesn't feel damp but that is also a concern, do I need a DPM? The two damp patches you see are where the plasterboard were touching brick and drawing moisture up through it. Hopefully that is sorted now there is a gap, although I don't know how long the plaster will take to dry.

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[Russtavo]

Bump, no one brave enough to comment on this thread then?

 

[ladylola]

Wbp ply would be your best bet here. Fixed to the joists where you can and bedded on a gunnable adhesive above the old hearth.I wouldn't worry too much about a dpc as any moisture is going to find its around it anyway.

 

[Russtavo]

Thanks for the help, actually I decided to bash it up in the end. Think I will span some new joist across the gap, overlapped and fixed to the existing joist and put down an 8x4" sheet of WBP ply as you suggested. I will put some DPC roll between new joist and brick though. Hopefully this will work, soon find out!

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[ladylola]

As you have gone to all that trouble there is the option of fitting the ply lower and running floorboards over the top should you decide to sand up the floor as opposed to fitting carpet.