waterproofing idea?

[kstronach]

ok i've had an idea for a totally waterproof finish for my oven and wanted some opinions of other forum members and what they think.

At work we use a product called decothane, basically its a resin based flat roofing system used on flat roof extensions and the like! its applied in two coats. the base coat is painted on then a fiberglass matting is set into this and painted over. then the top coat is applied the next day and is simply painted over the top.

now this would obviously be a completely sealed finish which wouldn't be breathable so i would have to make certain all the moisture within was out, unless i could leave a couple of vents?

to achieve this finish i think i would have to first vermicrete over my existing render coat as render is prone to cracking, then apply the decothane on top of this, also the extra insulation will be beneficial and make sure the exterior of the dome never reaches the 80 degree service temperature of the product.

also decothane has elastic properties and is tolerant of thermal movement and is easy to repair as you can just paint over the cracks and apply some more re matt over.

here are some links if any one wants a butchers i would love some opinions as i'm seriously considering this!

qaportal.liquidplastics.co.uk/Our-Products-Decothane-Systems

gbr.liquidplastics.sika.com/en/solutions_products/refurbishment/waterproofing-membranes.html - on this link on the right hand side of the page are links to the product data sheets of base coat and top coat!

thanks

keith

[bookemdanno]

Cor, that's a new one! But it just might work. You'd be a pioneer for that one too!

I've got a FG Roof section on my extension which used something like that.

One of the guys on FB used a gearbox breather cap to provide a vent for his oven. You could cut down to the blanket layer or vermicrete layer with a core drill and glass in a threaded bush, into which you could screw the breather cap. This would allow any vapour exchange and a pressure release. The vent may lead to slightly reduced heat retaining quality, but wh knows for sure!?! Its a dome headed version, so its still waterproof. I'll try to find out the details for you Keith.

Like you said, i think you'd have to be happy that your oven is as dry as possible too.
You will need to estimate where you might get hotspots near to the chimney and arch, etc and find a way to reduce them to an acceptable level too.
Its a viable and very good waterproofing system, it'll just need a bit of thought on tailoring it to a WFO. If you have experience of using it, your one step forward. Grab a few bits going spare from a job and start design and heat trials!

I've always thought a rolled steel dome, that simply sits over an insulated oven would be an awesome finish too.

Good Luck!
Danno

[adm]

Maybe not rolled steel....but I have been toying with the idea of copper shingles. Sadly, I can't find a source in the UK, but they look beautiful:

[bookemdanno]

That'd be too much of a pikey magnet round these parts!

[Gaelceltic]

Oct 3, 2013 10:20:14 GMT adm said:

Maybe not rolled steel....but I have been toying with the idea of copper shingles. Sadly, I can't find a source in the UK, but they look beautiful:

Wow, love that look. Think it might be a bit ostentatious in my rural, rustic setting, but would love it above my fire place inside. ;D

[kstronach]

took some temps tonight on the fired up oven and no where gets above the temps decothane can apparently handle so thats a start, i think its going to be next summers jobs now as i can't guarantee they'll be no moisture in the oven at this time of year! i'll try and get it vermied over soon then keep it sheeted through winter when its not in use! i'll also have a word with the boss see if he'll let me have half a tin of leftover as its bloody expensive stuff i think its going on £300 a tin! so if hes not feeling charitable it may be a non starter! a rolled steel dome danno would look awesome that would also be a first! i'd bet it wouldn't be cheap either though to have manufactured although it would last indefinitely! sorry adm i'm not to struck on the copper shingles though!