Is it best to plaster straight onto the concrete wall or put plasterboard onto the concrete first then plaster
Question:Hi there, we are in the middle of renovating our house and have new concrete walls downstairs and studded walls upstairs. We have been told to plasterboard the concrete walls first then skim over the top, but is this the best thing to do? We are told many different things. Obviously upstairs we will get plastered. thanks
Answers:
either put a bonding coat up first or you can stick the walls and then plaster but these are not generally diy jobs
render then skim.!!
What shape are your walls in, you should be able to plaster straight on, but if they aint great put up plaster board!
hi there,if you want to plasterboard the walls first known as dot & dabbing,this would be the option you should take if you are doing your self.otherwise i would personnelly float & skim the walls for a more solid finish.
Nothing I can really add, except to say that you don't plaster over plasterboard - the clue is kind of in the name, you see.
If you are not a good plasterer and wish to do it yourself. I would suggest opt for dry lining, that is fixing taper edge plaster board to the walls with plaster dabs, which is as it says. mix up a bucket of dry lining adhesive slap a load of dabs on the wall then push your sheet of plaster board onto the dabs straighten the face with a long straight edge up, across and diagonal both ways. then when dry tape over the joints with jute scrim and fill out with joint filler using a wide spreader
i think the concrete will hold to much moisture for you to plaster directly on it . you could probably do it though. but i wuold think you wuold have problems with it at some piont. stud the walls insulate then put up sheetrock. i was thinking you may want to put plastic as a vapor barrier before you rock check into that
I am querying what you say about new concrete walls downstairs. You may also
want to consider other factors to enable the correct wall finish to be applied.
I assume your walls downstairs are old and that for some reason you have built some new walls in concrete or are the walls made using concrete blocks? Perhaps you are in mainland Europe not UK. or you are in a commercial building where walls might be concrete? It is unusual to have concrete walls in UK in domestic buildings although there are some with "No-fines "concrete walls and partitions.
You may want to consider the following:
If the walls are external, it may be that they require to be plasterboard finish to comply with your Building Regulation Consent.(I assume you have the relevant approvals ?)(Plasterboard contributes to heat insulation as part of an external wall construction)
Plasterboard can also contribute towards sound insulation and towards fire protection for separating floors and walls or for fire protection of structural members.
If you are accommodating services such as power and water you may need to chase out the concrete if you are plastering directly on to the concrete. Beware of reducing the effectivenesss of steel reinforcement which may be embedded in concrete columns and beams.If the walls are concrete blockwork , deep chases may affect the strength and stability of the wall depending upon the wall thickness and its performance requirement in terms of compressive strength (Are there any loads on the concrete walls such as beams, floors, loadbearing timber partitions above?)
Plaster "Dot & dab" (Go to British Gypsum website or Redland Lafarge web site) or better still walls framed with timber or metal frame with cables in /or behind protective conduits conduit might prove to be the best solution.
Another consideration may be the damp situation and the intended use of the area.
For example plasterboard in a bathroom might be less effective than cement render on concrete or blockwork with a tiled finish.
There are many proprietary cement render
systems which are used in solid wall construction where damp penetration could be an issue.
I wonder what your architect /designer /surveyor specified as you seem to be seeking an answer to a question that should be directed to your building design professional who has an overview of the whole project criteria.
I suggest you gIve him a call.
My own preference generally is to design using thick block of a compressive strength
appropriate to loads imposed thereon with mesh re-inforced joints, to chase out the block for services and give a 2 coat plaster finish. This gives a hard durable finish that you can hang shelves, pictures, cabinets ,coat hooks etc on in any location
Good luck
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