Cement boards
- Thread starter zombie
- Start date
Formby plastering
Well-Known Member
I done the inside of a garden room the other day rendered came in to do the outside thought he leave them to it three days later lit on the floor had a giggle to myself
Formby plastering
Well-Known Member
Spell check changing my every word to make me look like a mong
theclemo
Private Member
f**k me zombie I was thinking about this today I s**t u not lol.
theclemo
Private Member
Runswithscissors
Private Member
Hi Guys
You have to be careful when applying a gypsum based plaster directly to a cement board that has a high suction..... I have seen lots of projects where a gypsum skim applied to Knauf Aquapanel Interior has shelled..... I believe that the board soaks the moisture from the skim and effects the bond during curing (cannot comment with regards to other cement based boards)
Knauf's Ready Mixed Plasters are marble based and do not have the same issue, they have a lower water content and bond to lots of surfaces without issues or need for primers
Knauf do have a Knauf Aquapanel Board Primer - not sure what its composition is TBH, but doubt it is a common or garden PVA
You have to be careful when applying a gypsum based plaster directly to a cement board that has a high suction..... I have seen lots of projects where a gypsum skim applied to Knauf Aquapanel Interior has shelled..... I believe that the board soaks the moisture from the skim and effects the bond during curing (cannot comment with regards to other cement based boards)
Knauf's Ready Mixed Plasters are marble based and do not have the same issue, they have a lower water content and bond to lots of surfaces without issues or need for primers
Knauf do have a Knauf Aquapanel Board Primer - not sure what its composition is TBH, but doubt it is a common or garden PVA
Yeah wedi is ok. Pva would do on that fine. Extruded polystyrene core I think.
Cement boards are the heavier aqua panel type or hardi backer. They can be aggro to skim when pva'd.
Topspread16
Well-Known Member
vfr12
MOTORC*NT
These are diferent story mate, nothing to do with cement based boards. Suction is unbelievable and can kill any render if not done right . Remember once I had to render 3 columns in very famous shop in Watford and the air conditioners were on max to dry all the paint etc. I asked you f they can turn them off till I finish, answer was no. I said I have to grit them first then and will come tomorrow- no time has to be done today, shop is opening tomorrow. f**k me never experienced anything like this. Watered the board and you can see how the water disappears right in front of you. The render was just crumbling literally and that was wetherby- some serious sticking s**t. Gave up at the end and went home .
@zombie hope is not too late mate
These are diferent story mate, nothing to do with cement based boards. Suction is unbelievable and can kill any render if not done right . Remember once I had to render 3 columns in very famous shop in Watford and the air conditioners were on max to dry all the paint etc. I asked you f they can turn them off till I finish, answer was no. I said I have to grit them first then and will come tomorrow- no time has to be done today, shop is opening tomorrow. f**k me never experienced anything like this. Watered the board and you can see how the water disappears right in front of you. The render was just crumbling literally and that was wetherby- some serious sticking s**t. Gave up at the end and went home .
@zombie hope is not too late mate
Its on the floor!
I tried to plaster on cement board, but I couldn't get it to work. This resource was very useful to me. If anyone is interested in this subject, you can take a look at this resource.
structotech.com
How to Plaster Over Cement Board (With Tips) - StructoTech
Learn about cement board and its benefits for plastering. Choose the right plaster, apply it evenly, and achieve a perfect finish for a durable surface.
structotech.com