wet plastering

[daz1968]

high guys. when undercoat plaster is applied to walls can it be spread in one hit or is it a two coat spread and if so what thickness am i looking for cheers ??? ??? ???

 

[kane]

Depends how bad the walls are,but genrely done in one coat at 10/12mm

 

[nelly]

I think British Gypsum say bonding should be 8 mill which is just stupid. They should say "aprox 10 mill"

Anyway

If you are new, which I guess you are. If you go over the wall with a fairly thin coat first then go back over it imediately with another thin coat you will find it easier than trying to get the full thickness on in one go.

This is the method I use when I have to get plaster on thicker than normal, on nasty horrible walls.

 

[Danny]

What I normally do is first coat then drop back and second coat I find that it rules off easier!

Its also good if the seccond coat is a little wetter than the first.

Danny

 

[spunky]

as f**k**g tight as poss without the block showing through

 

[essexandy]

high guys. when undercoat plaster is applied to walls can it be spread in one hit or is it a two coat spread and if so what thickness am i looking for cheers ??? ??? ???

If your using S&C or Hardwall then you should be aiming for an 11mm thickness everything else being equal (which it rarely is), this gives a cover over cappings and lecy boxes and you get a more even suction than if you try and scrape it on tight in places. I always put it on in one coat at this thickness only two coating when it gets near 16mm.

 

[bodplasterer]

If you havent done any float and set before i would recomend dot n dab which is alot easier than floating plus if you use tapered boards you dont have to skim it and just tape and joint.

 

[oasis]

high guys. when undercoat plaster is applied to walls can it be spread in one hit or is it a two coat spread and if so what thickness am i looking for cheers ??? ??? ???

If your using S&C or Hardwall then you should be aiming for an 11mm thickness everything else being equal (which it rarely is), this gives a cover over cappings and lecy boxes and you get a more even suction than if you try and scrape it on tight in places. I always put it on in one coat at this thickness only two coating when it gets near 16mm.

Andy my man how do you manage to lay 11mil on one pass? i can never get render on thick at all? and if i do it falls off! i push it on hard and then it is on thin? so i over go it with some more and it drops to the floor faster than Mrs spunky knickers?

 

[essexandy]

Crikey I don't really know how to answer that Oasis, I just do what I was taught to do all those years ago.
I suppose the first thing that needs to be right is the muck, obviously it can't be to wet or to stiff. With S&C it needs to be mixed so that it is what I call smooth, not all fluffed up and full of large bubbles, nor can it be what is referred to as short (not enough plasticiser or not mixed long enough).
As a right hander I work from right to left and take comfortable sized trowelfuls of muck and when putting it onto the wall I don't try and spread it to far and pull it into the muck that's already on the wall (if that makes sense). Doing it this way you deffinitely drop less that pulling the muck onto the bare part of the wall.
I can put it on the wall up to about 20mm thick using this method no problem.
I don't know if this helps at all, sometimes when you just do something without giving it any thought it can be hard to explain what it is you do. In the past I've had labourers say "oh you do it like" this or that and I just say "I honestly don't know, I'm thinking about fishing while I'm spreading not how I do it".

 

[richardbrown]

Its all in the mix oasis there is nothing worse than bad gear.

 

[oasis]

thanks Andy ... iv not used muck from a mixer as of yet as iv only done the odd wall or patch's and like that fireplace i mixed by hand in a gorilla bucket. i just did 5 handfull of sand and one of cement and a splash of Feb. dint no if i mix it up to thick or thin.. but i lay it on to old brick work and its only about 5-6mil thick. so its OK to lay another coat on top of this to get a thicker finish?

one day ill go do a day for rich or Andy!

 

[bodplasterer]

Hey oasis you can use your mixing drill to mix s/c it mixes it to a cement mixer standard just keep it on the slower setting.

 

[carlos]

As Andy said only I am left handed. Its all in the mix just having bad gear can make it drop off even when your grinding it on nice and tight. Also if your on old brickwork to much suction will do the same.