Filling gap in plasterboard

stuart45

GDB2222 said:

Why am I wrong to think I would just fill with bonding plaster? 

You aren't wrong, just another method of doing the job. It depends on what materials he has lying around.

FreeBear

stuart45 said:

The hole looks like the back of a Catnic lintel.

Agreed. Shoving a bit of Celotex type insulation in there will help to avoid a cold spot. Even better if the whole wall could be insulated, but that is extra work/cost/mess.

stuart45

FreeBear said:

stuart45 said:

The hole looks like the back of a Catnic lintel.

Agreed. Shoving a bit of Celotex type insulation in there will help to avoid a cold spot. Even better if the whole wall could be insulated, but that is extra work/cost/mess.

I would guess that house is a late 70's or 80's build and the old Catnic boot lintels had no insulation. Plus the joints back then weren't rubbed up to be airtight. Not such a problem if plastered,  but with Dot and Dab the air pushes through the joints behind the boards and causes cold spots on the wall.

Gavin83

stuart45 said:

FreeBear said:

stuart45 said:

The hole looks like the back of a Catnic lintel.

Agreed. Shoving a bit of Celotex type insulation in there will help to avoid a cold spot. Even better if the whole wall could be insulated, but that is extra work/cost/mess.

I would guess that house is a late 70's or 80's build and the old Catnic boot lintels had no insulation. Plus the joints back then weren't rubbed up to be airtight. Not such a problem if plastered,  but with Dot and Dab the air pushes through the joints behind the boards and causes cold spots on the wall.

It's mid 90s. To be honest we haven't really had an issue with this, the house heats up quickly and stays hot for a while and no obvious cold spots. The exception is the poorly converted garage which I need to deal with at some point.

And yes, it's a Catnic lintel.

Thanks for the advice everyone, lots to consider!