Rendered Dome Finish - Waterproofing

[Poops]

Re: Rendered Dome Finish - Waterproofing

That's right, still some work to go. The photo is not the best angle, but the brick skin has been filled with vermiculite around the dome to within about an inch of the top of the last course. The first coat of render is flush with the top course, and was a rough coat to hold the vermiculte insulation onto the dome.
I still need to finish the render, which will direct any rain down the sides (hopefully ....)

[brickie in oz]

Re: Rendered Dome Finish - Waterproofing

HI
It looks like the way the oven is at the moment that it will catch all the water, you still have to do some work I take it?

The waterproof additives work just fine, but you wont be able to paint the dome with water based paint after if you use it.

[Poops]

Hi All

Looking for some advice on the finish for my dome. I have insulated the dome with vermiculite/cement 10:1 and a single coat (so far) of 3:1 standard plaster sand/cement render. I have another coat of render and then a final finish coat which I was planning to colour using oxide powder.

My question is whether a standard 3:1 render will provide adequate protection from the elements during the winter months (Adelaide Hills, South Australia). I don't want water getting through and soaking the vermiculite between the dome and brick outer skin, or soaking the render enough for it to steam up and crack during firings,

Has anyone used any of the waterproofing additives around, or painted the rendered dome? Still early stages of curing for me, so don't know how hot the outer skin is going to get yet.

Appreciate any advice.