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    H M Linehan's Avatar
    H M Linehan Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 8, 2007, 11:16 AM
    Joining 2 concrete slabs
    I own a 1000 sq foot home in New Hampshire. It was built in 1963 on a concrete slab with no footings or frost walls. We are about to add 896sqft off the back of the house. NH now requires slab on grade's to have 4' frost walls. After speaking to a builder we are concerned about how to join the new slab to the old one and not cause cracking and other problems...
    glavine's Avatar
    glavine Posts: 895, Reputation: 87
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    #2

    Oct 8, 2007, 02:25 PM
    We install rebar 1/2 thick into the existing slab and let them span out into the new slab
    flooring's Avatar
    flooring Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Oct 26, 2013, 10:33 AM
    Our add on room slab is separating from the existing house and we want to install glued down hard wood flooringover the whole area. What is the best way to bond both slabs together?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #4

    Oct 26, 2013, 05:01 PM
    Quote Originally Posted by flooring View Post
    Our add on room slab is separating from the existing house and we want to install glued down hard wood flooringover the whole area. What is the best way to bond both slabs together?
    A bit too late now. About the only thing to do is cut the slab, install bolted steel plates across the joint, fill in with sand mix and hope for the best . They should have tied the slabs with rebar before pouring the addition.
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