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walkereng
walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 2410
Experience:  Over 30 years of Structural Engineering experience.
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How do you install expantion joints into and existing core

Customer Question

How do you install expantion joints into and existing core filled block wall.
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.
Why do you need to install expansion joints in an existing wall?
Customer: replied 1 year ago.
the wall is approxamatly 40 meters long with no exspantion joints.
Expert:  StructuralEng replied 1 year ago.
Do you mean control joints?
Customer: replied 1 year ago.
Yes ,control joints
Expert:  StructuralEng replied 1 year ago.
How old is the wall?
Customer: replied 1 year ago.
The wall is only 1 year old.I have just terminated the builder and had a full building report by an indipendent building consultant .
He has listed the boundry wall has no control joints in it at all.
The VBA require one every 10 meters
Expert:  StructuralEng replied 1 year ago.
At this point, you'll need to sawcut the wall vertically.
Customer: replied 1 year ago.
Do i need to saw cut the wall all the way through the block ?
Customer: replied 1 year ago.
If i was to saw cut the block wall vertically,what is going to hold the wall together?
Customer: replied 1 year ago.
are you still there
Expert:  StructuralEng replied 1 year ago.
I apologize for the delay. It was 2 am here and I fell asleep
Expert:  StructuralEng replied 1 year ago.
This will depend somewhat on the design of the wall. Generally, CMU control joints are full depth, so you should saw cut all the way through. If, however, they would need to have bars continuous across the control joints then you will need to reduce the depth of cut to not cut the horizontal bars.
Expert:  StructuralEng replied 1 year ago.
If the wall is a year old, most of the shrinkage cracking has already happened, so cutting control joints at this point will probably not provide much benefit.

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