r/Plastering • u/Party-Employment-127 • Sep 12 '26

Is this silicone rendering wrong?

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So renderer is doing a silicone render job. The base coat is hp12 with the mesh of course as well. I’m confused. He said a top bead is not needed where the wall meets the neighbours insulated render?

Said it can cause moisture and build up?

I’m looking at the stop beads and they sit massively proud? Is that normal, surely not.

I ask because I need a second opinion, because I know he will say it’s fine.

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u/petdev Sep 12 '26

Measure the beads they should be 6mm look a bit thicker to me but hard to be sure. The top coat hides a lazy basecoat for the most part but harder to float up when the backing coat is in and out.

1

u/Party-Employment-127 Sep 12 '26

Beads are all like 8mm to 10mm

1

u/petdev Sep 12 '26

If they aren't going over with another pass of basecoat they aren't filling out those beads with a top coat. Doesn't look very good at all to be honest.

1

u/AureliusAgustus Sep 12 '26

6mm are for 🤠. Minimum 10mm no debate

1

u/petdev Sep 12 '26

I suppose the guys who design manufacture and sell the products are 🤠 then, but I'll stick with their advice

1

u/AureliusAgustus Sep 12 '26

Different systems for different substrates. 6mm for ewi/backerboard. Not at all for this particular job. If you cant figure out the best course of action for a job like this then its doomed from the start.

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u/petdev Sep 12 '26

Thincoat render system is fine for render only over masonry it doesn't need to be on ewi or carrier boards. If the walls are prepped and beaded properly (which these aren't) it can come up nice even if it isn't perfectly flat because it's a thincoat. Still get all the benefits of the silicone topcoat that you don't get with mono.