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[Cob] Marlin's rubble trenchYun Que yunk88 at hotmail.comWed Nov 2 09:04:00 CST 2005
Cat here! Keep it simple keep it natural and it will last oh about 500 years then if it falls down build another one! :) for the good of all C. ______________________________________________________________ From: "Peter Ellis" <dukegavin at hotmail.com> To: Coblist at deatech.com Subject: Re: [Cob] Marlin's rubble trench Date: Tue, 01 Nov 2005 17:15:38 -0500 >It seems to me that the material in that trench isn't chosen just >for its loadbearing character - in fact, might even not be primarily >for loadbearing qualities. I would expect that if it's not going to >be a monolithic waterproof block (say poured concrete with a >waterproofing coating) that it is very important for water to flow >through it readily. > >No matter how well the material can withstand compression, water >freezing and thawing within it *will* break it down. > >I would go along with Marlin on this one. > >Peter > > >>From: Marlin Nissen <marlin_nissen at yahoo.com> >>To: Mary Lou McFarland <louiethefifth at hotmail.com>, >>Coblist at deatech.com >>Subject: Re: [Cob] Marlin's rubble trench >>Date: Tue, 1 Nov 2005 08:21:38 -0800 (PST) >> >>We used 'river stone' or washed stone - 1 , 1 1/2 >>inches usually...it's actually from glacial drop >>around here. >> >>I have read (and it made sense based upon experience) >>that crushed limestone (finds etc.) packs down and >>actually becomes a type of lime/mud. If you drive on >>country roads (and I know you do, you're probably >>happy that it's not just dirt roads where you live!) >>you see the limestone and fines break down into finer >>and finer particles on the gravel roads. >> >>I assume underground that small limestone particles >>pack down into this same fine mud. While that may be >>'weight bearing' for awhile it also concentrates >>water, possibly heaves and can become a mud flow >>instead of foundation. Eventually, even if it's >>decades, a foundation of crushed limestone/fines seems >>like it would become indistinguishable from the mud >>around the foundation. That's what road base becomes >>as it breaks down if you dig into it with backhoe. >>I've seen the underlayers of a gravel road and it >>didn't look like a good foundation to me. Potholes, >>ripples, trenches, heave cracks ..... >> >>UNcrushable glacial washed stones will never (in our >>short lifetimes or human span) breakdown, drains water >>around them very well and supports and distributes >>weight very well. We even put landscape fabric around >>the sides of the trench to try to keep all >>organic/compactible matter out of the rubble trench >>itself. On a house I'd try bentonite or another >>barrier as a skirt going out from the foundation to >>make it dry and better insulated as well. >> >>BTW, a sandy/fines subfloor seems very different as >>it's not expposed to outside water (different drainage >>and temp shifts) so it's main function is to allow >>floor blocks to be layed or a thin layer of cob on top >>of it. When it's exposed to mud it becomes ONE with >>the mud. Sand still seems better then limestone as it >>too doesn't really ever breakdown and is excellent of >>nestling something into it like concrete or >>flagstones. >> >>Marlin >> >>--- Mary Lou McFarland <louiethefifth at hotmail.com> >>wrote: >> >> > Marlin you mentioned in your post that you like the >> > washed gravel over the >> > crushed limestone. Just wondering why you had that >> > preference. Hadn't >> > thought about it before but had assumed that I would >> > use the crushed stuff >> > because of it's greater stability when taking on >> > weight or impact like >> > floor or arena base or shoulders on secondary >> > highways. For clarification, >> > when you say crushed limestone, I am assuming that >> > you mean what we call >> > base gravel around here and it has all the fines in >> > it and that is what >> > gives it it's strength. Also wondered what size you >> > usually go with. >> > >> > >> > >> > _______________________________________________ >> > Coblist mailing list >> > Coblist at deatech.com >> > http://www.deatech.com/mailman/listinfo/coblist >> > >> >> >> >>__________________________________ >>Yahoo! FareChase: Search multiple travel sites in one click. >>http://farechase.yahoo.com >> >>_______________________________________________ >>Coblist mailing list >>Coblist at deatech.com >>http://www.deatech.com/mailman/listinfo/coblist > > > >_______________________________________________ >Coblist mailing list >Coblist at deatech.com >http://www.deatech.com/mailman/listinfo/coblist
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