Hairline crack in new plaster - fill or paint?

TomsMom

In our house renovation we had a wall in the lounge rough coated and skimmed over the old wall and a serving hatch to kitchen on the same wall filled in with plasterboard and skimmed. There's been no heating in the room as the work is still ongoing.

Today we noticed a very fine hairline crack around the area where the hatch was.

When we come to paint the room, do we need to fill this with anything (it really is very fine) or do we just paint over it and if so will it show? We've never had newly plastered walls before, always had papered walls, so this is new to us.

KT1985

I would fill it. If it does show through paint as it is it will annoy you forever. Or is that just me...?

misgrace

I have found in my jobs that when I have come across serving hatches that have been plastered over plasterboard they do sometimes crack.
Infact i have just come across this again :rolleyes: in my last job, yes you can fill it, but the chances are it will crack again, so the best way around this I have found, is to fill it as you would normally, then dilute some PVA and apply this over the filler, just over the filler, and not on the actual plaster.
You can either leave it, and paint as normal, but the best way to hold it and stop any other cracks apearing in the other parts of the PB/hatch, is to line.

You would have to line the whole wall where the hatch is to the nearest corner that goes on on to the next wall, but dont paper the othe next wall, just the wall where the hatch is, 1000 grade will do.

If you have on the other side of the hatch wall your kitchen cupboards, or your having any work done like tiling, or even a new kitchen, then the banging will make the pB crack and come loose, then you will get more cracking on the actual skim plaster thats covering the PB, so to avoid this, lfill and line the area.

TomsMom

KT1985 wrote: »

I would fill it. If it does show through paint as it is it will annoy you forever. Or is that just me...?

No, not just you KT. I'm a pedantic, pernickity perfectionist so it would drive me crazy!

TomsMom

misgrace wrote: »

I have found in my jobs that when I have come across serving hatches that have been plastered over plasterboard they do sometimes crack.
Infact i have just come across this again :rolleyes: in my last job, yes you can fill it, but the chances are it will crack again, so the best way around this I have found, is to fill it as you would normally, then dilute some PVA and apply this over the filler, just over the filler, and not on the actual plaster.
You can either leave it, and paint as normal, but the best way to hold it and stop any other cracks apearing in the other parts of the PB/hatch, is to line.

You would have to line the whole wall where the hatch is to the nearest corner that goes on on to the next wall, but dont paper the othe next wall, just the wall where the hatch is, 1000 grade will do.

If you have on the other side of the hatch wall your kitchen cupboards, or your having any work done like tiling, or even a new kitchen, then the banging will make the pB crack and come loose, then you will get more cracking on the actual skim plaster thats covering the PB, so to avoid this, lfill and line the area.

Thanks (again ) for you help Misgrace. Printed off and filed with the other advice. I think we'll do the kitchen stuff first then, there's just floor cupboards and a chimney hood going on that wall but there will be some tiling as the hob is going on that side.