naf123

Thanks . Will try liquid but may not be possible for practical reasons as some part of it (the extension part !) is sand blinded . Is there an ideal way to join a sheet dpm to a liquid dpm? Maybe will do some kind of taping around the edges .

Thank you so much ! How does one screw battens through the DPM into the concrete ? Surely that punctures the DPM? I guess there is special plugs for this ? Thank you !

So just to double check , So on top of the insulation (and VCL) I have two options 1. A floating floor of 22mm t+g and lay whatever flooring on top of that . Or lay engineering timber direct into VCL. 2. Lay a floating batten on top of the VCL and then lay solid timber flooring on top of that ? But would that introduce an air gap under the solid timber ? Thanks !

Thanks . But battens to the floor will probably damage the DMP. I thought the concept of a floating floor was no battens. Thanks !

Yes we do need to pour thin screed on the garage floor to make it 100% level then dpm then double PIR then 22mm t+g - thanks for the suggestion of caberdeck . I may actually use EPS under the PIR if it saves some money . Thanks for advice !

Correct , it will be a living space - an area of very low use eg office or bedroom .

Hello 225mm difference between garage and house (garage is lower) Planning to double up on 100mm celotex insulation followed by t+g. Is there any reason not to do that ? The other option which I don't want to do is 100mm celotex and 100mm screed . Thank you !

I'm thinking of moving away from screed toward t+g boards (22mm moisture resistant) especially as it's a small room . Does the same principles above (re liquid dpm to wall joints with dpc) also apply to a t+g floor? Thank you !

Sorry it's a garage conversion . The house was replumbed few years ago and there are radiator pipes on one wall of the garage to go upstairs etc anyway that garage will become a room soon .

Reason why I asked because lot of pipes (radiator etc ) on that internal side , it wouldn't be possible to seal .

Thank you ! What about internal walls of the garage - Do they need sealing ?

Thank you . I'm a novice so still struggle to understand details in depth . So the dpm will run up the wall . Pour the slab. Let the slab dry. Pull down the dpm away from the wall and paint few coats the gap in there with liquid dpm....Then trim the dpm just above floor level . Is that correct ? Appreciate your reassurance.

Doing some sort of self building a porch extension / garage conversion . Painful process for a complete novice like me but I'm grateful to this website for the help and advise easily available on the forums !

I'm in a similar situation . My garage conversion has an existing dpc and I need to work out how to connect the dpm to the dpc after the floor slab is poured . I think after trimming the dpm around the screed perimeter , apply few coats of liquid dpm (or silicon mastic) between the floor wall joint should do the trick . Is that correct ?