March 18, 20215 yr Hi all. I'm just in the process of laying the upstairs floor joists and this detail is giving me a headache. Buildup is blown EPC beads in cavity. @ overhang between joists /steels will be glass fibre/wool with 75mm sheet of PIR underneath (under boarded with cement board probably). Note the red airtightness/vcl membrane (ignore where it laps into tray - no need for this as wet plastered wall), whilst this is fine I wonder whether there should be a secondary external membrane such as protect vp400 to protect against windwashing and vapour release, or is this unnecessary in my scenario (drawn in blue). The attached link whilst for a timber suspended floor suggests there should be, but is this unnecessary where I have impermeable PIR underneath that I can tape? Note I would run the VP400/Pro Clima Solitex Plus straight under rather than draped to pickup insulation under the 1st storey cavity wall. A Best Practice Approach To Insulating Suspended Timber Floors | Ecological Building Systems Thanks in advance. Edited March 18, 20215 yr by sean1933
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