K Rend on a clay oven

[Byronius Maximus]

Hi oh wise pizza oven builders,

After a fun summer of spending too much time making pizza and not working on my oven, I am finally going to render it. Most of the threads I've seen on here abotu rendering are for doing so to a brick oven; I am assuming that there is nothing inherently wrong with rendering a clay oven?

I have never done any rendering or plastering (or anything similar) before but this thread by Danno has encouraged me to use K-rend: ukwoodfiredovenforum.proboards.com/thread/1492/rend

Looking at local suppliers, I find this: www.travisperkins.co.uk/K-Rend-Champagne-Silicone/p/536007
I will send K-rend an email, but I assume this is the right product to be using, as there is quite a choice. e.g. this one doesn't require a base coat, but many others that they produce do need one. Any advice on this would be appreciated, before I splash the cash. Looks like I'll need 4 bags, based on the exterior of the dome being around 1300mm diameter.

Any suggestions away from K-rend are welcome. I'm not keen on building a roof as I don't want the oven covered up like that, I'd much rather render it instead.

Thanks,

Byron

P.S. my oven build thread from a year ago is here: ukwoodfiredovenforum.proboards.com/thread/2711/start-clay-build-derby?page=2

[downunderdave]

Sept 26, 2017 19:44:58 GMT Byronius Maximus said:

Hi oh wise pizza oven builders,

After a fun summer of spending too much time making pizza and not working on my oven, I am finally going to render it. Most of the threads I've seen on here abotu rendering are for doing so to a brick oven; I am assuming that there is nothing inherently wrong with rendering a clay oven?

I have never done any rendering or plastering (or anything similar) before but this thread by Danno has encouraged me to use K-rend: ukwoodfiredovenforum.proboards.com/thread/1492/rend

Looking at local suppliers, I find this: www.travisperkins.co.uk/K-Rend-Champagne-Silicone/p/536007
I will send K-rend an email, but I assume this is the right product to be using, as there is quite a choice. e.g. this one doesn't require a base coat, but many others that they produce do need one. Any advice on this would be appreciated, before I splash the cash. Looks like I'll need 4 bags, based on the exterior of the dome being around 1300mm diameter.

Any suggestions away from K-rend are welcome. I'm not keen on building a roof as I don't want the oven covered up like that, I'd much rather render it instead.

Thanks,

Byron

P.S. my oven build thread from a year ago is here: ukwoodfiredovenforum.proboards.com/thread/2711/start-clay-build-derby?page=2

There are basically two kinds of render that sit on a scale. One one end is the cement based renders and on the other acrylic renders. To complicate things there are others in the middle that are cement based but contain acrylic. Basically the cement renders come ready mixed dry in bags, just add water. Acrylic renders come ready mixed, wet in buckets. Other products,dry in bags, sometimes labelled Acrylic Render are actually "acrylic modified cement renders". Acrylic can also be added to cement based renders when mixing, usually in the ratio of 1 part acrylic to 3 parts water, but you can do less or more, 2:1 is common for renders applied to previously painted substrates. Most renders are also partially waterproof, when mixing water with it you'll find it difficult to get the water to soak in when you first start mixing. Adding acrylic will also increase the waterproofing of the finished render. The cheapest is cement render without added acrylic. The most expensive is the ready mixed acrylic render.

[Byronius Maximus]

Thanks for the tips, Dave.
Is K-rend waterproof then? I was under the impression it was, but could be mistaken. I'm trying to remove the need to have the ugly blue tarp over the top of the oven - I expect I'll keep it on there for prolonged periods of non-use, but it would be nice to not have to worry as much about whether it's going to rain!

[downunderdave]

Sept 27, 2017 21:38:57 GMT Byronius Maximus said:

Thanks for the tips, Dave.
Is K-rend waterproof then? I was under the impression it was, but could be mistaken. I'm trying to remove the need to have the ugly blue tarp over the top of the oven - I expect I'll keep it on there for prolonged periods of non-use, but it would be nice to not have to worry as much about whether it's going to rain!

K rend have lots of different products. Like I said most cement based renders are partially waterproof. The 100% acrylic render is totally waterproof.

[dave36]

Sept 27, 2017 21:38:57 GMT Byronius Maximus said:

Thanks for the tips, Dave.
Is K-rend waterproof then? I was under the impression it was, but could be mistaken. I'm trying to remove the need to have the ugly blue tarp over the top of the oven - I expect I'll keep it on there for prolonged periods of non-use, but it would be nice to not have to worry as much about whether it's going to rain!

Byronius

I used Krend silicone FT, which is the same stuff as your TP link. It’s described as water repellant and it seems to be fine, the water runs off it and I can’t see that it’s being absorbed. I cover it with a tarp for the winter, but left the tarp off for much of the summer. Be sure to seal where the dome hits the base surface as that’s where the water ends up (I used a silicon sealant designed for outside use, worked fine).

D

Ps- I used the HPX base too, but not worth it, would go one layer if I did it again

[Byronius Maximus]

Thanks very much. Will probably do it next weekend if the weather is dry enough. I am between K rend and just going with a cheaper render plus masonry paint.