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Discussion Starter · #1 ·
1. A practical question:

With the chimney and house being on separate foundations with a gap in between, what measures can be taken to prevent the entry of water through the gap and subsequent damage behind the building wall?

2.The Smithsonian had an exhibition on the work of the mud masons of Mali awhile ago. If you haven't seen the masonry work of these artisans from various cultures spanning a variety of locales, these articles offer an entertaining vista:

http://www.environmentalgraffiti.com/featured/mud-structures-citadel/2227

http://www.touropia.com/amazing-mud-brick-buildings/

http://www.kuriositas.com/2010/08/in-land-of-dogon.html

http://www.amusingplanet.com/2012/05/manhattan-of-desert-shibam-yemen.html
 

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Discussion Starter · #4 ·
How big of a gap? Less than 1" you could backer and caulk. Any larger than that and you might want to make sure the chimney isn't settling.
Great question. Let me do some pronto digging to give you a full report that I won't have to update tomorrow. Back in awhile.
 

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Discussion Starter · #5 ·
Digging done, the gap tapers from about 3/4" or 5/8" at the top to contact/near contact on one side. Crawling under the house today showed water had been working on the bricks on the wall through soil that had infiltrated the gap.

On the other side, the separation of the foundations is very little but there is a low spot in the house foundation pour at the junction to the chimney foundation pour that would harbor moisture.

I've used backer rod and Loctite PL S10 polyurethane before. Any other caulk nominations?

Thank you.
 

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Discussion Starter · #8 ·
The caulk suggestions are appreciated.

I liked the feathers and wedges avatar. The bent ears of my feathers have wires fitted in drilled holes in the ears that prevent me chasing them down the hole when the rock heaves. I've always loved the progressive, musical increase in tone the feathers and wedges make with each hammer blow.

If it is any inspiration to anyone, here are some pictures from some of the URLs first cited on mud masonry:

Landmark Historic site Architecture Tree Place of worship

Bobo Dialousso Mosque
Burkina Faso (The Country name literally means "Land of the Upright Men", morally speaking.)

Historic site Sand Building sand castles Spire Landscape
Djenne Mosque masons doing yearly restoration.

Landmark City Urban area Human settlement Sky
Shibam, the Manhattan of Yemen since the 1500s.
 

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In my opinion a chimney/fireplace and it's footing should always be separate from the rest of the house unless the rest of the house is mass masonry. I usually see this small void pointed up with regular mortar, caulking would do as good or better job
 
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