Help....again !!

[MartinH]

Morning folks ...sorry to ask yet again, but I feel more confident with the answers provided on here than at the local tiling store.....where sometimes I walk out thinking "did I actually get an answer there??"

Job is Bathroom Wall tiles

Size : 320 mm x 450 mm - 2.4k in weight
Depth : 8mm
Type : Ceramic
Surface : Polished

Wall Surface - Part skimmed stud wall/Part Solid Wall

Job will include tiling within a shower enclosure
Questions are :

1. Best trowel to use for job ?
2. Will the plastered areas need to be primed ?
3. Assuming powder based adhesive ?
4. Would I need to back-butter given size of tiles?

...any other advice, as always gratefully appreciated ...many thanks all

[diamondtiling]

You are fixing heavy tiles so re-boarding the skimmed areas would be a good idea.
Use an 8mm trowel and check for 100% coverage on a regular basis.
Powder adhesive is always best.

Using aqua panels in wet areas should be considered, this will give you total peace of mind for preventing water damage at a later date.

[jwatson]

as diamond says. and gypsum plaster needs bonding with acrylic.(bond everthing and u will be covered) gypsum plaster and cement based adhesives react chemicaly together and create a expanding crystal which in time will delaminate the tiles. search ettringite on your search engine and you can read up on this subject.

[tilerjason]

go on joe,

no more need be said lol