I will need to plaster some of my homebrew thermal tile backer boards
- the fibreglass mesh is stuck on with Mapei flexible adhesive - Can
I just skim plaster over it?

(If i were tiling over plaster I believe Mapei would recommend their
Primer G to promote adhesion - would this be needed t'other way
around? presume they thinking of weight of tiles, adhesive, agro
factor?)

TIA
Jim K

In article ,
Jim K writes:
I will need to plaster some of my homebrew thermal tile backer boards
- the fibreglass mesh is stuck on with Mapei flexible adhesive - Can
I just skim plaster over it?

(If i were tiling over plaster I believe Mapei would recommend their
Primer G to promote adhesion - would this be needed t'other way
around? presume they thinking of weight of tiles, adhesive, agro
factor?)

I have no idea what your backing looks like, but you can skim over
anything if you PVA it. Of course, if it moves or gets wet, the plaster
may fall off. If the backing isn't flat, you should use a scratch coat
first (bonding coat will stick to most things, but again it will come
off if it moves or gets repeatedly or continuously wet).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Mar 14, 10:31 pm, (Andrew Gabriel)
wrote:
In article ,
Jim K writes:

I will need to plaster some of my homebrew thermal tile backer boards
- the fibreglass mesh is stuck on with Mapei flexible adhesive - Can
I just skim plaster over it?

(If i were tiling over plaster I believe Mapei would recommend their
Primer G to promote adhesion - would this be needed t'other way
around? presume they thinking of weight of tiles, adhesive, agro
factor?)

I have no idea what your backing looks like, but you can skim over
anything if you PVA it. Of course, if it moves or gets wet, the plaster
may fall off. If the backing isn't flat, you should use a scratch coat
first (bonding coat will stick to most things, but again it will come
off if it moves or gets repeatedly or continuously wet).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

OK I'll give it a go Ta.

NB the areas I plan to plaster are not likely to get wet (perhaps
condensation from a shower) they will be areas above tiles, or areas
next to the tiled shower cubicle,sink, bog etc that are not tiled.
Background:- As an experiment I've lined the two solid external walls
with 50mm insulation homemade into "tile backer boards" a) to avoid
using plasterboard behind tiles in/around the shower area b) to avoid
wasting internal space (small room) on plasterboard c) to see if it
works ;)

Cheers
Jim K