On my oven build i have rendered the outside with a clay/sand mix and then a finish coat of lime mortar for waterproofing .There has been some cracking , mainly due to high ambient temperatures during the work and firing the oven too soon.More of a problem is the thin face of firebrick above the oven opening , below the lintel , about 3.5 cm deep.In normal , non heat exposed construction i would use some metal mesh that's available for corners or edges when plastering but i think that expansion due to heat will just crack the mortar . Has anyone come up with another fix ?
Yess. 1.-Rated up to 500 celsius continuum or 800 short time. it isbasalt fiber mesh if you want to have only supperficial layer. Is about 10$/sq. meter 10/10 mm mesh. or if you want to replace all basalt fiber dispersable. This for mixing direct in plaster.About 9$/ kg. You can order sample pack or buy from smarter-building-systems.com I already contact them and orderd sample pack. 2.- linseed oil direct over the plaster.3-4 layers . This will polimerize in time and made a watreproof surface.
I do know a mason specialized in traditional ovens. he used a glassfiber mesh used for rendering mortar and is not satisfied with that mesh because is coated with some resin and when oven is hot is giving away bad smelling odours. those are phaenolic resins ( organic compounds) that are not good to have around you family the render is not cracking but smells bad. Smells bad= health problems in future. I do try to avoid such products because one never knews how it will be affected. thats why I did speak about uncoated mesh and dispersible fiber. Those are pure stone. I did a small scale experiment with alumina cement from Kerneos mixed with rockwoll for blowing(not plates) and mixed them with foam from a foam generator( used for making aircrete) I got it a heat rezistan ligtweight plate. I did test the plate over the riser of a 200mm BBR when I tested the core before buliding the stove. I do know that Rockwoll is coated with som oils for moisture reppelling. No craks no nothing. Maybe u can mix Rockwoll with clay/sand and it will not cracking no bad smells If you have no problem with that maybe you can try.
it's outside the oven dcp , on the outer face where the door sits so not exposed to high temperatures.I think it's the different rates of expansion - the brick and the mortar that's covering it - that is the problem .
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
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mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
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topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
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anounaki: Hi, why I cant upload photos when I make new tread to this forum?
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deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post email@example.com..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8