hi all - hope I have posted in the right area
Having just got off the phone to the Celotex technical line I would really welcome your comments on the best way to tackle this problem as I don't really think they understood my query!
We are renovating solid brick property and plan to internally insulate ourselves. We had planned to use Celotex 50mm board on 25mm battens and then counter batten to create a service void. However, we have since revised this after advice from our builders and are now thinking of using 77.5mm insulated plasterboard (PL4000) to save time and avoid issues with cables needing to be in conduits.
My query relates to what to do with the insulation board at intermediate floor level. We have solid timber joists that sit in the solid wall. With the original plan i wanted to bring the boards through the intermediate floor to avoid cold bridging and keep a good vapour control layer by putting sealant around joist ends. That way we can put recessed lights in the ground floor ceiling without worrying about vapour control etc. However, can this be done with pl4000 and is the plasterboard left on or removed? Celotex have advised me against this but couldn't really come up with a reason why not. They recommended using ga4000 between but why create more joints??
Look forward to your comments.
bw
jd
Having just got off the phone to the Celotex technical line I would really welcome your comments on the best way to tackle this problem as I don't really think they understood my query!
We are renovating solid brick property and plan to internally insulate ourselves. We had planned to use Celotex 50mm board on 25mm battens and then counter batten to create a service void. However, we have since revised this after advice from our builders and are now thinking of using 77.5mm insulated plasterboard (PL4000) to save time and avoid issues with cables needing to be in conduits.
My query relates to what to do with the insulation board at intermediate floor level. We have solid timber joists that sit in the solid wall. With the original plan i wanted to bring the boards through the intermediate floor to avoid cold bridging and keep a good vapour control layer by putting sealant around joist ends. That way we can put recessed lights in the ground floor ceiling without worrying about vapour control etc. However, can this be done with pl4000 and is the plasterboard left on or removed? Celotex have advised me against this but couldn't really come up with a reason why not. They recommended using ga4000 between but why create more joints??
Look forward to your comments.
bw
jd