Win a copy of 5 Acres & a Dream this week in the Homestead forum!
  • 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 skip 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
  • Anne Miller
  • Pearl Sutton
  • r ranson
  • Mike Haasl
  • James Freyr
stewards:
  • paul wheaton
  • Joylynn Hardesty
  • Burra Maluca
garden masters:
  • Steve Thorn
  • Greg Martin
gardeners:
  • Kate Downham
  • Jay Angler
  • thomas rubino

Rubble Trench Options

 
Posts: 16
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I've been looking at various options for what to use in a rubble trench foundation. One thing available locally at a fairly low price is asphalt millings. Now I really don't know much of anything about asphalt millings, so I'm wondering if anyone can fill me in....any chance of using this for a rubble trench foundation?

Thanks!

Tom
 
Posts: 8
Location: Western NY
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
A primary function of a rubble trench foundation is it's ability to act a drain for any water. Without knowing exactly what asphalt millings are like, but knowing what asphalt is like, I would be concerned that the material would not remain "loose" enough to function as a drain. Over time would it compact into one large wad of asphalt? It seems with rubble trench, the key is have large enough material to promote fast drainage, but small enough to compact effectively, eliminating settling. I have only done one rubble trench, so I am by no means an expert.
 
pollinator
Posts: 325
Location: Victor, Montana; Zone 5b
91
hugelkultur forest garden food preservation
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I would steer clear of the asphalt trimmings. They seem to be most useful for driveways due to their ability to fuse together, harden and compact in hot conditions. I doubt without direct sun exposure they would ever do this, but the compacting might lead to a rubble trench that won't drain properly. It might be a good resource to mix with gravel if you are hard pressed and you can really get it that cheap. It is supposed to be more freeze resistant than gravel which is a plus.
 
Posts: 64
4
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It is soft, a primary use of the trench is to distribute the loads in the structure to the ground, so if you use a material that is soft it will not do that well. You need an engineering type answer, as some footings are placed over foam, and others over rock, depending on the loads it may be OK either way. I don't like the idea of asphalt because it is sorta yucky chemical stew.
 
Posts: 77
Location: Maryland, USA
5
tiny house solar woodworking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Millings is the stuff that gets scraped off the top of an asphalt (black top) roadway when they are scraping it to provide a rough texture for the new top layer of asphalt to stick to when repaving.

I agree with the post above. It is too soft and will compact over time.
 
Don't listen to Steve. Just read this tiny ad:
Permaculture Technology Jamboree: June 29th-July 10th, 2020, Wheaton Labs
https://permies.com/wiki/permaculture-tech-2020
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!