Plastering brickwork on Edwardian house?

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firstly, are you a plasterer? have you any experience of cement rendering and materials?
A plasterer would normally screed your floor, but not so much these days , it’s a dying skill.
 
bennymultifinish said:
firstly, are you a plasterer? have you any experience of cement rendering and materials?
A plasterer would normally screed your floor, but not so much these days , it’s a dying skill.
Click to expand...
I've decided not to try to do the screed myself and will hire a plasterer to do it
 
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With the age and construction and your given skills I wouldn’t plaster it. i’d batten the externals with 2x1 roofing battens (with a dpc behind each one) and insulated pb. and dot dab the internals, providing there’s evidence of a dpc and no signs of dampness low down in the internal walls.
 
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bennymultifinish said:
With the age and construction and your given skills I wouldn’t plaster it. i’d batten the externals with 2x1 roofing battens (with a dpc behind each one) and insulated pb. and dot dab the internals, providing there’s evidence of a dpc and no signs of dampness low down in the internal walls.
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Is it better to put plaster on the bare brick?
 
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not necessarily.
you could waterproof cement render and skim inside which should keep the wall dry largely. but moisture will build up inside the wall.
or you could lime render it which will allow it to breathe and allow moisture to pass through it and harbour behind your units.
the batten option covers all bases , its diyable allows evaporation and ventilation of the brickwork and will outlast you if you do it properly.
that’s just my opinion.
 
bennymultifinish said:
not necessarily.
you could waterproof cement render and skim inside which should keep the wall dry largely. but moisture will build up inside the wall.
or you could lime render it which will allow it to breathe and allow moisture to pass through it and harbour behind your units.
the batten option covers all bases , its diyable allows evaporation and ventilation of the brickwork and will outlast you if you do it properly.
that’s just my opinion.
Click to expand...
Is solid plaster which is breathable is a good solution and could the non external walls be done in ordinary plasterboard?
 
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teaboyjim said:
Do you think solid plaster which is breathable is a good solution?
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not particularly behind kitchen units and wall units. maybe 100 years ago when kitchen units were mainly free standing and air could pass between and around .
Ordinary pb on internal walls.
just my opinion like i say .
someone will be along shortly with a different idea.
 
I would do what Benny says, unless the external wall is sealed/rendered. IMHO if you internally insulate a solid wall, there is a risk of interstitial condensation (because the wall fabric is colder because of the insulation) and if it is sealed/rendered there is less possibility for it to dry out.
 
mrrusty said:
I would do what Benny says, unless the external wall is sealed/rendered. IMHO if you internally insulate a solid wall, there is a risk of interstitial condensation (because the wall fabric is colder because of the insulation) and if it is sealed/rendered there is less possibility for it to dry out.
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So if I put up battens and insulated plasterboard then there's a risk of interstitial condensation but is this only if the exterior face of the wall is sealed/rendered?
 
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Yes. have a read. https://www.heritage-house.org/ but also read the installation instructions e.g. https://www.siniat.co.uk/en/product...nternal-boards/gtec-thermal-k-board#downloads

If you install internal insulation, inevitably the wall fabric stays colder. Probably cold enough to have some internal condensation. This has to be able to evaporate and dry. In a solid wall, this can be through the external surface. If you seal this, it can't.

This is only my opinion. I have extensively used insulated PB, but only on an early cavity wall (1902) - but it has been very successful for me.
 
By insulation in the batten gap you end up causing a temperature differential in the sold brick wall which then could cause condensation on the inside
 
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