The Bottom and sides of my house are brick with cavity which is insulated. The top half, being dormer style is wooden construction. It seems beyond the plasterboard there is a 4inch or so gap then felt and tiles on the outside. I must be losing a huge amount of heat through this.
The obvious thing (to me at least) would be to put Celotex or similar sheets next on the outside of the plaster board between the joists, but it would mean that all the tiles and wood they are nailed on plus felt would have to come off. Given that it's all in small sections, it would be a hell of a job and the cost of paying someone to do it would likely take a long time to break even on what I save in heating cost.
So I'm wondering, seeing as I'm about to decorate the upper rooms whether there is the option to make some small holes at the top of the plasterboard and drop or blow in some insulation. My main concern though is that filling the void completely might lead to moisture problems. Could someone please comment on that ?
The things I'm thinking of are:
Cavity insulation ( is there a way of blowing it in DIY ? )
Loose lay rockwall insulation dropped through holes
Polystyrene beads, blown or dropped in
Polystyrene packing chips
Canned foam, though would probably be difficult to measure right.
What do people think of these ideas, or is there a better way ?
The obvious thing (to me at least) would be to put Celotex or similar sheets next on the outside of the plaster board between the joists, but it would mean that all the tiles and wood they are nailed on plus felt would have to come off. Given that it's all in small sections, it would be a hell of a job and the cost of paying someone to do it would likely take a long time to break even on what I save in heating cost.
So I'm wondering, seeing as I'm about to decorate the upper rooms whether there is the option to make some small holes at the top of the plasterboard and drop or blow in some insulation. My main concern though is that filling the void completely might lead to moisture problems. Could someone please comment on that ?
The things I'm thinking of are:
Cavity insulation ( is there a way of blowing it in DIY ? )
Loose lay rockwall insulation dropped through holes
Polystyrene beads, blown or dropped in
Polystyrene packing chips
Canned foam, though would probably be difficult to measure right.
What do people think of these ideas, or is there a better way ?