I have a bungalow which when I moved in had the attic converted. I now have 2 bedrooms with a small hatch door on one of the walls which provides access to the rest of the roof space. These rooms are freezing and as its an older property there doesn't seem to be any insulation. There has been some insulation laid on the floor space but that appears to be it. I was looking to purchase and install some airtec double insulation as I thought it the easiest and most effective for me but after reading up on it there is a lot of focus on vapour and condensation...im now clueless. Initially I was going to cover the slopes of the roof but given I don't intend to use the space other than for storage I thought best to do the walls of the bedrooms. As you stand in attic and look towards wall there is just the joists with the plasterboard from the room walls there at the moment. If I install this airtec over the joist leaving the gap would this be sufficient enough? I'm concerned that as I have no clue what I'm doing this airtec will reflect heat and create condensation onto the plasterboard. Can anyone help please and recommend suggestions