Roof insulation query
Discussion
I'm about to make a loft in my place habitable.
Head height is marginal (partly as I'm 6'4") so I want to give as much a feeling of "space as we can.
Right now the room has plasterboard attached to the roof rafters, along with a plasterboard ceiling (leaving a void above to the ridge).
What I'm thinking of doing is stripping out all the plasterboard exposing the beams etc and plastering between the rafters - the house is very old so this would look "right" and, I think, give more of an impression of space even if the practical head height isn't much changed (maybe a few cms).
There's absolutely bugger all in the way of insulation up there at the moment. All that's above/around the plasterboard is void and even the odd bit of daylight. I can see a rough black textured shiny plastic material which I suspect is the backside of some felt under the clay tiles?
So the question is...I'm hoping some sort of insulating board could be put between the rafters, against/near the black material, ahead of plastering to give a bit of insulation? I'd want it to be breathable and would likely use lime plaster over the top of it. There's also not much depth to play with - I've seen similar done, but with much deeper rafters. Pretty sure I have less than 70mm. Possibly less than 50mm.
Does anyone have recommendations of the sort of thing I should be looking at? And whether this is a dumb idea...
Head height is marginal (partly as I'm 6'4") so I want to give as much a feeling of "space as we can.
Right now the room has plasterboard attached to the roof rafters, along with a plasterboard ceiling (leaving a void above to the ridge).
What I'm thinking of doing is stripping out all the plasterboard exposing the beams etc and plastering between the rafters - the house is very old so this would look "right" and, I think, give more of an impression of space even if the practical head height isn't much changed (maybe a few cms).
There's absolutely bugger all in the way of insulation up there at the moment. All that's above/around the plasterboard is void and even the odd bit of daylight. I can see a rough black textured shiny plastic material which I suspect is the backside of some felt under the clay tiles?
So the question is...I'm hoping some sort of insulating board could be put between the rafters, against/near the black material, ahead of plastering to give a bit of insulation? I'd want it to be breathable and would likely use lime plaster over the top of it. There's also not much depth to play with - I've seen similar done, but with much deeper rafters. Pretty sure I have less than 70mm. Possibly less than 50mm.
Does anyone have recommendations of the sort of thing I should be looking at? And whether this is a dumb idea...
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