We have an old bungalow with two rooms in the roof. We are not sure exactly when the rooms were added, but it was done a long time ago. The rooms are uninsulated, and the loft space needs proper insulation, so I'm planning to insulate the remaining loft space and walls.
I'm not sure how to handle the void between the ground floor ceiling and the loft rooms. The rooms in the roof are on metal I-Beams and large wooden joists, with air free to circulate - you can see from one end to the other between the joints, and there is no insulation at all. As a result ground floor has only a lath/plaster ceiling with no insulation and is losing a lot of heat.
My current plan is to use some plastic sheeting to seal the gap between ground floor and then insulate between the joists in the open loft, then have the wall insulation butting up against the joists before adding the extra 170mm layer in the open loft. We will still have to do something for the loft room ceilings, but this should be a good start.
However I have some concern about potential condensation in the void space between the floors. It should be a warm space, but not very well ventilated, and I would appreciate any advice if this is likely to be an issue, or if I should simply omit the plastic sheet to allow some breathability.
I'm not sure how to handle the void between the ground floor ceiling and the loft rooms. The rooms in the roof are on metal I-Beams and large wooden joists, with air free to circulate - you can see from one end to the other between the joints, and there is no insulation at all. As a result ground floor has only a lath/plaster ceiling with no insulation and is losing a lot of heat.
My current plan is to use some plastic sheeting to seal the gap between ground floor and then insulate between the joists in the open loft, then have the wall insulation butting up against the joists before adding the extra 170mm layer in the open loft. We will still have to do something for the loft room ceilings, but this should be a good start.
However I have some concern about potential condensation in the void space between the floors. It should be a warm space, but not very well ventilated, and I would appreciate any advice if this is likely to be an issue, or if I should simply omit the plastic sheet to allow some breathability.