I've just had an extension constructed whereby we have an integral garage with a bedroom above and utility to the rear. Garage is unheated, door is non insulated and has an external cavity wall. Partition wall to rear of garage into utility is single skin blockwork with door opening.
Looking at building regs, it suggests I full fill the 200mm ceiling voids with wool. From another job, i've got a couple of 100mm insulation boards spare and wondered what the best way would be to use the boards to prevent the room above suffering cold.
1. Boards on their own should be up against the floor. Should I use some wool alongside it to get a better job? If so, should I put this between floor and PIR board?
2. The blockwork partition between garage and utility needs insulating. I can see a potential cold bridge already as the wall is between joists and pretty much touches the chipboard above it. Building regs says 100mm insulation boards against the wall. If I was to put 50mm either side, would this achieve the same as 100mm on the habitation side? I was hoping that by insulating both sides, then any cold bridge would be reduced upstairs.
Looking at building regs, it suggests I full fill the 200mm ceiling voids with wool. From another job, i've got a couple of 100mm insulation boards spare and wondered what the best way would be to use the boards to prevent the room above suffering cold.
1. Boards on their own should be up against the floor. Should I use some wool alongside it to get a better job? If so, should I put this between floor and PIR board?
2. The blockwork partition between garage and utility needs insulating. I can see a potential cold bridge already as the wall is between joists and pretty much touches the chipboard above it. Building regs says 100mm insulation boards against the wall. If I was to put 50mm either side, would this achieve the same as 100mm on the habitation side? I was hoping that by insulating both sides, then any cold bridge would be reduced upstairs.
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