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Posted By: betterroofwhy do you want the floor to be vapour permeable? for the cellar or the living room?you shouldn't need much in the way of ventilation unless your house is airtight, in which case you can go for some kind of mrhv system.
Posted By: WatchItHi RogerA form a wool between the joists, underlined with a breather membrane is exactly what I did to my cellar.My joists are 175mm and I had some 170mm Glasswool I used to top up the loft insulation, so I used that between the joists. I went for a breather underneath for a couple of reasons, vapour permeability, some level of airtightness and also too keep the fibres away. Installing the wool above my eyes was a nightmare so using a net and allowing more fibres to fall was something I wanted to avoid!!Also picked a breather membrane with a white underside called Web UV10 so that it gave a lighter apprearance down there. All the walls are now white too and it looks much better.
Posted By: betterroofYou can fill any cavities with some rokwool or equivalent. then a vcl over everything, sealed to the walls, then your plasterboard
Posted By: WatchItMy cellar is fairly dry. The walls were plastered and this was VERY damp, it was holding loads of water. I knocked it off, re-pointed and used some treacle like paint instead. Didn't exepect it to do as well as it has but it the walls are always dry now. The floor was already pretty good so I didn't touch this. We have a window in there which is left open 365 days, this really helps with the ventilation.
Posted By: squowseis the water vapur presuure a result of relative or absolute humidity? I know th RH is much less upstairs.
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