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Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall

 
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Old 03-13-2016, 12:02 PM   #1
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Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Hey guys,

Doing a basement addition on a home that is perpendicular to an existing CMU block wall. I had planned on doweling and epoxying the old foundation to the new but am struggling with the best strategy for joining the block foundation walls together.

I am reading of a few options:

1) No tie in at all and just one elastomeric isolation joint
2) Wall ties tacked into the old block wall and mortared in between the new block
3)Filling the old wall solid and doweling into the new wall
4) Angle iron attaching the old wall to the new wall

Any thoughts or suggestions would help
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Old 03-13-2016, 01:04 PM   #2
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


My suggestion would be let an engineer spec what's best. Nothing on the plans?

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Old 03-13-2016, 01:14 PM   #3
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Could you use some of these?
http://www.insulationexpress.co.uk/P...FcrjGwod1IQA9A
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Old 03-13-2016, 01:40 PM   #4
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


sorry , that link does not work
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Old 03-13-2016, 01:56 PM   #5
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Are the footings doweled together? If so option 3, if no option 1
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Old 03-13-2016, 01:59 PM   #6
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Sorry, how about this one.

http://www.screwfix.com/p/sabrefix-w...ss-steel/56037
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Old 03-13-2016, 05:17 PM   #7
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


neat product
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Old 03-13-2016, 05:39 PM   #8
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Is the existing block wall filled with grout? If so i would drill some rebar and epoxy it in every couple of coarses. If its hollow i would cut some matching openings in the new and the old block every couple of coarses and fill them both up with grout and pieces of rebar to lock the new and old together.... I dont know if its the proper way engineering wise but i dont like cold joints. They always seem to have issues and it's amazing how frickin strong grout and rebar is.....i get to demo walls all the time that is filled with grout
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Old 03-13-2016, 05:55 PM   #9
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Here is another way to skin the cat.Page 286 shows tie bars. I would break holes in existing block to install,along with holes to pour grout.


For the footing,I would dig under existing footing to allow new one to lock around it along with re-bar and epoxy.


I would run these ideas past engineer,let them sign off. Why assume the mantel of responsibility. Design is truly their bailiwick.
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Old 03-13-2016, 05:57 PM   #10
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Forgot to post connection.



https://books.google.com/books?id=ET...gether&f=false
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Old 03-13-2016, 06:22 PM   #11
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Pour the cell when done, as you build hollow out a course, put corner steel into the cell and into a deadman beam . Do that for 30-50% of the courses.
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Old 03-13-2016, 06:26 PM   #12
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Forgot to add, pour adjacent cells o/c, if you pour 1 its good , if you pour 2 adjacent cells, or 1 whole block its better.
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Old 03-14-2016, 01:33 PM   #13
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Why do the walls have to be tied/laced at all?
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Old 03-22-2016, 06:19 PM   #14
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


I am doing this on a indoor basement project at the minute.
We are tying the new 6" block wall into the existing with 15m rebar every 16" and filling the first block solid, the rebar is 12" long 6in 6 out. It will be epoxied into the existing. All engineer spec's.

Also on the same project we have to build a 6" block wall Parallel to the existing basement wall addition at the back of the home. The homeowner wanted to top up his little single story bump out but when the previous owner had the foundation walls built they contractor used 6" block.
We have had to underpin (my first time) the entire addition and over pour the underpin to allow for a new 6" block wall to be built.
The new parallel wall is to tied into the existing with 10m rebar every 16" both ways, epoxied into the existing and cells filled solid, have to also allow 1/2"-1" gap between the 2 walls and fill solid.
Nice little project, except the underpinning part the boys hate it, they better get used to it gonna do more of it espically in the winter,
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Old 03-23-2016, 06:58 PM   #15
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


6" foundation walls??? And the house is still standing? Must be some free draining soil or something
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Old 03-25-2016, 10:49 AM   #16
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Quote:
Originally Posted by stuart45 View Post
Excellent things the wall starter kits used them loads of times
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Old 03-25-2016, 11:12 AM   #17
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Re: Tie In New CMU Block Wall Perpendicular To An Existing CMU Wall


Quote:
Originally Posted by dom-mas View Post
6" foundation walls??? And the house is still standing? Must be some free draining soil or something
Just little timber frame addition in top, we found in Wednesday one of the walls is only 4" in one corner.

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