|
|
Post by matthewwalker on Aug 27, 2013 6:04:46 GMT -8
I have not heard. I'll inquire and try to post an update.
|
|
|
|
Post by byronc on Sept 14, 2014 5:08:06 GMT -8
Hi Matt,
How did you join the half barrels, i.e. to keep the loose fill from working through the seams?
In the half barrel ducting system for the bench, is there any concern for thermal cracking of the fill (non-loose material such as cob/cobcrete/claycrete) due to expansion differences between the fill and the steel?
To join the half barrels, I was thinking about overlapping them at their seams an inch or so, and use fiberglass woodstove gasket tape sandwiched in the seam for a gas tight seal, and bolt the barrels together. I'm thinking in terms of the best approach for an indoor system.
|
|
|
|
Post by matthewwalker on Sept 15, 2014 18:43:23 GMT -8
Hey Byron, I'm traveling right now and this tablet sucks to type on, so please excuse my brevity. In the case of the outdoor system, we taped em and called it good. Once warm, it's pulling in rather than leaking out.
Cob will make an excellent, flexible seal. I know it seems unlikely, but it works. Use your best mix at the joins and don't overthink it. You won't need bolts or fiberglass, just build up adequate mass over the top and any leaks will be minuscule if they exist at all. All mass heaters leak, but when warm they are pulling in.
|
|
|
|
Post by byronc on Sept 16, 2014 2:31:03 GMT -8
No sweat man, I know how it is typing on anything smaller than a full size keyboard. By all means, don't feel pressed to reply to my stuff during your travels. No hurry at all on this end.
Very good on joining the half barrels. Got to thinking about it, and with 4 to 6 inches of "claycrete" over the top of the half barrels mine is going to be pretty much monolithic.
At present I'm contemplating an indoor system consisting of a 10 foot long straight bench of about 3.5 half barrels, into about 15 feet of vertical chimney at the far end, and driving it with a classic 8" J straight out of "the book", with its exposed 55 gallon drum and all. The sides of the bench will be constructed of brick, which will double (obviously) as forms for the "claycrete" fill over the half barrels.
|
|
|
|
Post by DCish on Sept 16, 2014 2:52:46 GMT -8
What recipe are you planning for the claycrete?
|
|
|
|
Post by byronc on Sept 16, 2014 5:06:52 GMT -8
Made plenty of DIY concrete but this will be my first go at "claycrete".
I'm thinking Lincoln 60 Fire Clay to masons sand, 1:3. That'll be used for the first inch or so to seal the half barrels. Then more of about the same mix, maybe a little more clay added in, and some half inch rock, for the remainder of the thermal bench fill. I'll make some test bricks first, to see how the mix "stacks up".
Addendum: from my notes, and this is probably from either Ianto Evans RMH book or from E&E Wisner, clay to sand "cobcrete" should be composed of about 30% clay to 70% masons sand. So the first few inches, the "sealing layer" over the half barrels, will actually be this mix.
|
|
|
|
Post by DCish on Sept 16, 2014 6:28:54 GMT -8
Cool, thanks!
|
|
