plastering after tile removal

[billozz]

i have just removed some old tiles and now want to have a go at plastering the walls, is it possible to just skim over the old adhesive or do i have to re-render, never plastered before onto a wall , be gentle please

 

[brist]

Knock off any loose fragments and plaster away. Good luck your gonna need it

 

[makitaman]

PVA the wall prior to skimming it over though.

 

[billozz]

hey guys decided to put bonding on the wall first as there were a few deepish holes to fill went on okay and i pva'd the wall first, however i have noticed some cracks appearring is this a problem and what has caused it
thanks
Bill

 

[Richard C]

Plaster will craze & even crack if you try & lay it on too thick; total thickness depends on the type of plaster you’re using - Bonding is supposed to be OK up to 8mm but I always build up the total thickness in 2 stages. Bonding also prefers low suction backgrounds &, again, will craze if the water gets drawn out too quickly. I use a water bottle on both Bonding & Hardwall several times after the final trowel & this helps stop crazing as it cures. You should still be OK if it’s only surface crazing, tap the area to see if it’s adhered; hollow sounds are not good news.

 

[billozz]

another couple questions guys, btw thanks very much for the help so far.
do i have to scratch the bonding before applying the finish and will a corner trowel help me get a better internal corner, they look a bit uneven at the moment, im sure the guys that do this for a living dont need one, but would it help a novice

 

[Richard C]

You don’t need to scratch the bonding before applying the finishing skim, give everything 2 very good coats of PVA, the second after the first has dry (I always apply the 1st coat the night before) & the 2nd just before plastering. I don’t use a corner trowel & have my own method of getting the corners nice & straight; to be honest, I think using one may be more hindrance that help to a beginner. If you’re not confident about the result, I would use a stop bead but if the wall is already uneven, it may be of limited help. I always use a stop bead on window reveals against the frame as they are fiddly & it guarantees you a nice straight edge where it’s very noticeable.

Plaster one wall at a time, don’t attempt to work a wet corner; & do a wall that you won’t see much of first to see how you get on. Good luck, your gonna need it but you never know, you might be a ‘natural’!