Garage conversion help

themoneyguy

I have decided to convert the garage and I need a little help on the best way to raise the floor to house level.

I need to raise the floor by 200mm from concrete slab.

I am considering 2 options :

1. Lay dpm and secure with battons directly into concrete. Lay 7x2 frame over battons and secure to walls. Lay joists between constructed frame and place rigid insulation between joists. Finish with 18mm ply.

2. Secure wall plate to walls and lay joists with joist hangers. Place insulation inbetween. Finish with 18mm ply.

Is there anything wrong with the above ? Any suggestions ?

Also have to batton walls for new drywall. Should I do wall frame before floor or floor first and then screw base plate directly onto floor ?

Thanks in advance

Rabbo

Option 1 would be preferable than trying to bolt a timber to the wall.


If it was me I would lay radon barrier, install services, install 125mm PU board insulation (kingspan/xtratherm), pour 75mm screed with fibre reinforcement or 1 layer A142 steel mesh

More solid structure, less chance of problems with rodents and draughts and continuity of insulation

themoneyguy

themoneyguy wrote:

2. Secure wall plate to walls and lay joists with joist hangers. Place insulation inbetween. Finish with 18mm ply.

Rabbo wrote:

More solid structure, less chance of problems with rodents and draughts and continuity of insulation

Thanks Rabbo

Your suggestion sounds better but the back half of the garage was converted before we bought and that floor is raised on timber joists. If your way I think I would have to do the whole floor.... which I am trying to avoid.

If I went with my option 1 should I do floor and stud wall out after or the other way around ?

Rabbo

I would do the stabbing after the floor, don't see the benefit of doing the walls first

Calahonda52

Planning Permission ?
whats the remaining head height, after u do roof?
Either timber floor option: ventilation?