Using external render beads

[DIYedboy]

I'm uncertain as to whether 2 sets of beads have to be used...............The thermalite walls are up, the scratch coat needs to go on, so I presume render beads are nailed on and the scratch coat can then be applied and levelled to the edge of those beads.

when the second coat is to be applied, does another set of corner beads etc have to be fixed over the scratch coat so that the second coat can be ruled and rubbed up?

 

[London Mike 49]

The best place for advice is The Plasterers Forum .com, they are a bit rough and ready on there but always helpful.

 

[vinn]

You dont say what materials are being used or who is doing the rendering?
Follow roughcaster's render posts (or steve's) on here to get an idea of whats what.

 

[roughcaster]

You only use 1 stop bead.
When you scratch coat, you only come out to half the thickness of the bead, so if you're using, say, a 10 or 12mm bead, only come out half way,, ish. Once the scratch coat has set and cured, and you're ready for the top coat of render to go on, then you can bring the render out flush to the edge of the bead.
Don't forget to put a measured amount of waterproofer/plasticiser in the scratch coat, otherwise, the suction will be a nightmare, when rubbing/floating up the top coat.
You never use 2 beads at all.

 

[roughcaster]

If you're using bell cast beading along the bottom, you can apply the scratchcoat a little thicker, where the bead kicks out, but still leaving room for the "top coat" render/roughcast.

 

[DIYedboy]

Many thanks RC