• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • paul wheaton
stewards:
  • Joseph Lofthouse
  • Jocelyn Campbell
  • Mike Jay
garden masters:
  • Steve Thorn
  • Dave Burton
  • Joylynn Hardesty
gardeners:
  • Carla Burke
  • Pearl Sutton
  • Greg Martin

replacing fireplace with RMH.

 
Posts: 60
Location: Westboro, WI Zone 3.5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Everyone,
After reading more than a little on the RMH I've decided to replace the behemoth of a fireplace in my livingroom. Here is the monster http://homesteadingtechies.com/rocket-mass-heater-the-beginning/. How much would something like this weigh, do I have to worry about the weight?

I've found a formula https://www.facebook.com/groups/rocketmassheaters/814341021942843/ to figure out the stress load on floor.

any thoughts are appreciated.
 
gardener
Posts: 2949
Location: Upstate NY, zone 5
128
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
In very general terms, a RMH will weigh 2 to 4 tons more or less. If you use the ordinary "bench" style, it will be spread out over a large floor area, and depending on the specifics of your floor joist sizes and orientation you might be able to support it without added reinforcement. You will be safer adding support under the floor joists, and it might be truly necessary. If you are trying to follow codes, you may be required to have continuous masonry or possibly steel support from the ground up no matter how strong your joists are.

If you want to build a "bell" style RMH with a profile similar to the fireplace picture you posted, you will definitely need full masonry support from the ground up; it is both more concentrated in the loading and taller so as to present more danger from uneven settling possibly tipping the heater over.

What sort of foundation do you have for the existing fireplace? What are its dimensions, and what is nearby in the basement?
 
gardener
Posts: 3044
Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
134
  • Likes 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Damian, don't touch that chimney, transform it! It already has it's own support i think.

So far, there's only one who followed my advice!

http://donkey32.proboards.com/thread/1274/rocket-heater-fireplace-design

Read this whole thread, i think it's a condensed version of all i posted previously.

When you look at this batch rocket, you realize that you're not far off with your chimney.

http://batchrocket.hostoi.com/html/foto.html


Other links!

http://www.permies.com/t/31382/a/13956/chimneybell2.skp?download_attachment=true

http://www.permies.com/forums/posts/list/40/31382#246585



 
Glenn Herbert
gardener
Posts: 2949
Location: Upstate NY, zone 5
128
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Yes, if you aren't interested in keeping the existing fireplace, reuse it as part of the mass! Depending on what exactly you have and how much heat you need, you could have the whole unit in the current fireplace footprint or add some in front of it.
 
I am a man of mystery. Mostly because of this tiny ad:
All of the video from the Eat Your Dirt Summit
https://permies.com/t/106759/video-Eat-Dirt-Summit
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!