getting away with dot & dab ?

Question

On our new "Old" house the pre-victorian bathroom-extension type thing is having a much needed new toilet/sink etc.

Anyway. the construction of this area is a single-skin red brick with a red-mud type mortar. The original plaster literally dropped off all round so we need to replace the covering.

Space is very limited, so not enough space to batton/membrane/p.board

Should we be looking at just re-skimming the brick-work with conventional materials or could we get away with foil-backed p.board dot&dabbed to the block work?

there is no sign of any damp penetration as it stands.

The building _is_ grade II listed, but this is an emergency reovation as original (60's) bath,sink,toilet were all cracked. Plaster that fell off was not lime & hair like the rest of the property, just pink & powdery.

Any thoughts welcome

Pete.

Phil L · Accepted Answer

D&D isn't suitable for a single brick wall, neither is plaster really as it becomes soft and powdery as you have discovered...render is possbily the worst thing you could do and tiling is also a no-no, so you don't have many options left...the batten idea was your only real option but you say space is limited, although you would only lose about an inch and half more than you would with D&D,(tannalised 'roof' battens instead of 3X2) is space really that tight?

Jim Alexander · Answer

and the battens infilled with Celotex so the space used usefully.Jim A

PeTe33 · Answer

Thanks Phil.Then that's really my only option then.At least it won't interfere with the older construction materials.There are a few patches of cement render which I'm not going to attempt to remove.Here's a pic. of the bathroom as it was green on the window wall and the wall on the left are what's now removed. Bottom left by the sink is the House wall 18" stone/rubble so a big pillar whick makes one side of the doorway. the bath is level with the R/H side of doorway.It's also not noticeable but the L/H wall runs in towards the door end so front of pan is much closer to the wall than the cistern end.I'll re-asses this w/end to see what we can get away with.CheersPete

funtwo · Answer

Why?You could attach insulted plasterboard to prevent condensation / keepthe room warmer on that single brick wall. You could use dot and dab,I can see no reason not to.

Phil L · Answer

Because it will get dampAdhesive will absorb water through the brick and into the PB, try it on a 4in wall if you don't believe me - it never really dries out.

funtwo · Answer

If he has a penetrating damp problem maybe, otherwise he'll bealright. His biggest risk of damp is from condensation in a bathroomwith a half brick thick wall, insulation should prevent that.

The Natural Philosopher · Answer

Isn't there a foam backed plasterboard? That might be the best compromise..simply screwed into the brick?

Stuart Noble · Answer

That's what I'd do, with the d&d as a bit of a leveller maybe. Doesn't save space over the batten idea but less work, and better insulation

getting away with dot & dab ?

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