skimming spongy plaster and lath wall

2 Nov 2007
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United Kingdom
Am about to skim the upstairs hall/landing. The party wall is no problem but the other, internal wall is old plaster and lath. There are only a few small holes but a couple of areas are quite spongy, particularly on a narrow bit of wall between two door frames where I think the laths are loose after replacing the side of a rotten door frame.

Do I need to chop out spongy bits and plaster board or will skimming straight on top stabilise the dodgy bits? I don't want to start ripping loads of it out, but need to make sure it survives!

Any tips very gratefully received!
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Skimming over the 'spongy' bit is not advisable. The plaster will just crack very easily. You need to secure behind the old plaster, that either take down the plaster and secure the lathes or better still take the lathes out and plasterboard it. You may need a layer of bonding to make up the existing plaster thickness however.

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