Thursday, September 8, 2011

Re: Old Structural Mesh BF912

        If all else fails you could cut a small hole in the slab (say 2 feet square, perhaps smaller) and remove a sample for testing.  That way you would have the wire diameter, the spacing, and the yield strength, all with virtual certainty.  Of course, you then have to fill in the hole; but there are several well known procedures for that.
        The last time I went through this we had to install a new elevator and new exit stairs in the building to meet current code exit requirements.  We, therefore, had lots of samples available in the rubble; but you probably aren't that lucky.
H. Daryl Richardson
----- Original Message -----
From: Martin Li
Sent: Thursday, September 08, 2011 1:21 PM
Subject: RE: Old Structural Mesh BF912



Thanks for reply.  I did try WRI.  However, no any info or data about BF912 Mesh found.  I might try Linda Hall Library.


Thanks again,




From: []
Sent: Thursday, September 08, 2011 1:30 PM
Subject: RE: Old Structural Mesh BF912



Have you tried contacting the Wire Reinforcement Institute (WRI)?

Thomas Hunt, S.E.

From:        "Martin Li" <>
To:        <>
Date:        09/07/2011 02:37 PM
Subject:        RE: Old Structural Mesh BF912

We are working on a project that involves an existing reinforced concrete building with the drawings dated 1937.  The reinforcing specified for 3" slab over joists is BF912 Mesh.  Does anyone know BF912 Mesh?
Martin Li, P.E.
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