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RE: Inverted Key vs Starter Wall[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Inverted Key vs Starter Wall
- From: "Sherman, William" <ShermanWC(--nospam--at)cdm.com>
- Date: Fri, 31 Mar 2006 13:29:28 -0500
Although I haven't used the inverted keyway myself, my understanding is that it has been used in walls that have adequate thickness such that the keyway width can be designed to resist the shear. It is also my understanding that some structures have in fact experienced cracks that circumvent the waterstop with inverted keyways where detailing was not adequately designed. So you have a valid concern.
I typically show a starter wall. In some cases, I increase the top cover on slab rebar to 4-in and eliminate the starter wall (e.g., where the slab thickness is dictated by other requirements).
I have also sometime used expansive waterstops without a starter wall - usually in small structures such as junction boxes.
William C. Sherman, PE
CDM, Denver, CO
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