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Afternoon All.
This autumn/winter we hope to start the conversion of an external workshop into an office.
The current construction is single brick and it has two external walls. The remaining two walls are single skin but are internal as they have another room behind them.
The plan is stud work walls with a breathable membrane against the brick face, insulation infill plus seam tape, vapour barrier and then either plasterboard or ply/osb etc.
Floor will be floating with a DPC esque membrane, insulation and then boarded.
We have 200mm (?) joists so enough for 100mm of insulation and an air gap.
Now for the floor I suspect we will end up going with 100mm PIR board and were going to do the same in the walls and ceiling stud but that may be a bit too costly.
Insulation rolls are cheaper but have a higher U value but I'm stuggling to make a real life comparison as to how much better PIR would be - comparing 100mm vs 100mm.
Room is circa 6x3m and will have a window and double doors.
It needs to be habitable all year round and not cost a fortune to heat!
All suggestions, thoughts, musings most welcome.
M
internal as they have another room behind them.
Really internal, as in insulated, heated, lived in daily? If just "other shed rooms" you really need to treat them as external. I've found that insulating between deep joists is really faffy to get every little air gap gone, for the full depth of the PIR board, and if you don't, you are throwing money away. If you have the height to put the insulation, or even half of it, below the joists, do it.