Questions about weather sealing

[jet]

Re: Questions about weather sealing

I think that Dave (asudavew) did the contoured vermiculite/concrete mix under his oven.

[thebadger]

Re: Questions about weather sealing

Ken,

I actually used the Sani Tred product to seal some cracks in my basement. very interesting stuff. Sort of like "liquid" rubber. I think this might be an option. It's not cheap but you wont' need much. They sell a "sample" batch which may be enough for your needs. After you "paint" it on you could just pour the concrete. Only issue to think about is would the wet concrete adhere to the sani tred.

IM me if you want more infor.

Good luck,
thebadger

[Ken524]

Re: Questions about weather sealing

Hi Ken, I know you're looking for a solution making it water-tight at the front edge of the vent landing but since I'm going to build my WFO on FB board (just like you did with super isol) I want to address it earlier.

Dino,

Actually, I didn't use the SuperIsol/FB board. If I had, this would be a non-issue .

Ken
(President of the "Stay away from Kaowool Board" club)

[Ken524]

Re: Questions about weather sealing

cutting the insulating board 1" short of the front edge, leaving your firebrick landing overhanging 1" over it and filling that 1" deep by the width of the landing with Heatstop or Refrax and then doing whatever granite-tile etc right up to it?

That's actually one of my options. I think it's a good idea.

[sjmeff]

Re: Questions about weather sealing

In addition to the front edge, it seems like the first several inches of the landing floor would be susceptible to rain water (especially if the rain is falling at an angle). Since the plans call for there to be no mortar in between the floor bricks, I'm concerned water would go between the cracks and onto the isol board.

Is this a real concern and if so, how have others dealt with it?

Thanks,
Stephen

[Ken524]

Re: Questions about weather sealing

Stephen,

I haven't done anything about it (yet). My arch work and roof seem to overhang enough to keep 95% of the direct precip off the landing bricks. One of these days I'm going to make a vinyl/elastic cover to fit over the decorative arch bricks to protect the landing.

[sjmeff]

Re: Questions about weather sealing

Hey Ken - that's great that the majority of the water doesn't hit your landing. I'm planning to have an igloo enclosure without any kind of roof above it (we have a view in the back of the oven that we don't want to obstruct), though perhaps a similar vinyl/elastic cover over a decorative arch would work for me, too.

How important do you think it is to have the isol board extend to the end of the landing? Another idea I had was to have 2" lenghtwise cut brick for the last 4-5 inches instead of the isol board (so that the landing floor would still be level above it). I suppose water could still build up below and seep into the isol board. I'll have to think more about this...

Cheers,
Stephen

[Ken524]

Re: Questions about weather sealing

Maybe some others will chime in. I don't think it a really big deal to have a bit of water get into the SuperIsol board. Next fire you have will dry it back out.

I made the mistake of using Kaowool board under my oven; it turns to mush when wet. So, I have to be a bit more careful about moisture.

[Bandrasco]

Re: Questions about weather sealing

There are many options to solve this problem. The one that first comes to mind would be to use a waterproofing trowel-able cementicious membrane used for setting tile in and around heavy water areas like pools, shower pans, etc. I have used them in my past career and they work absolutely fantastic. Since they are cementicious you can bond mortar to them (as long as you use an acrylic/latex admix or premixed latex modified mortar). I would definitely use this method if it were me since this is it's function. Heck, you can even set tile with some of these products. I believe C-Cure, Mapei, and Custom all make waterproofing trowel-able mortars and they're available at most tile distributors. Most are multi-purpose meaning that they can be used as crack isolation membranes as well. I'm going to use this to waterproof my dome once insulated. I can then use my nice Chicago brick I just picked up and not worry about water intrusion!

I hope this helps.

Bill

[sjmeff]

Re: Questions about weather sealing

Thanks, Bill! Do you know if such products are well suited for high heat? I'm assuming the landing doesn't get too hot, but I'm nowhere near that point in my project to really know. I just finished the base, but am obsessing about this issue for some reason. : )

Cheers,
Stephen

[Wiley]

Re: Questions about weather sealing

sjmeff, I would think that keeping water out of the insulation would be a good idea in any region that is subject to extended periods of freezing during the winter. I can't imagine that water intrusion and subsequent freezing would be good for the insulation board. It might be a worth considering the idea of putting a temporary light (60 watt or better) in your oven and closing her up during the winter months if you are not using her.
Wiley

[egalecki]

Re: Questions about weather sealing

I was wondering about sealing where my metal chimney meets my stucco. I have the double-wall insulated chimney, so while it does get hot, I can still touch it. What could I use like caulk? I just don't want water to get in there, but I'd rather use something white or clear. Is silicone ok or will it get too hot? Does anybody know?

[Wiley]

Re: Questions about weather sealing

Elizabeth, 100 % pure silicone caulk is good for any temperature that you can still touch with your bare hand. I would recommend masking off well before caulking and using the soapy water trick for making a smooth fillet. Silicone is great stuff but be careful about getting overage anywhere you may want to paint or attach something in the future as it is hard to remove all traces. You can buy if in white or clear or colors and it's widely available.
Wiley

[dusty]

Re: Questions about weather sealing

I can still touch it. Is silicone ok or will it get too hot? Does anybody know?

Elizabeth,
Silicone is VERY heat resistant. If you can touch the pipe and not get burned, then silicone will work great.

dusty