Was going to be use airtight membrane (siga or isover) under the insulation on all my ceilings but then heard of these multifoil insulations (Gen-x, Aluthermo, Xfoil) that improve the overall u-value while also having the ability to provide airtightness if installed correctly (i.e. overlapping of joints and taped to the walls).
Would anyone recommed the follow@
rafter roll between 175mm joices as I need to keep my attic space, Gen-x attached to bottom of joice, counter batten the joices to leave an air gap of at least 25mm and the apply your insulated slab.
Will this work? Both to improve u-value and provide airtightness.
Any caveats associated with this type of installation.
Also what would people recommed doing in the attic to ensure a bit of warth to prevent condensation and mould growing on items stored there.
Would anyone recommed the follow@
rafter roll between 175mm joices as I need to keep my attic space, Gen-x attached to bottom of joice, counter batten the joices to leave an air gap of at least 25mm and the apply your insulated slab.
Will this work? Both to improve u-value and provide airtightness.
Any caveats associated with this type of installation.
Also what would people recommed doing in the attic to ensure a bit of warth to prevent condensation and mould growing on items stored there.