Structural Adhesive Wood-to-wood[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Structural Adhesive Wood-to-wood
- From: "Jeff Flansburg" <jeff(--nospam--at)johnwparkin.com>
- Date: Wed, 16 May 2001 13:14:06 -0700
- Delivered-to: fixup-seaint(--nospam--at)seaint.org@fixme
Here's the SHORT story:
We are looking for a structural adhesive conforming to ASTM D2559 or D4689 for a field-constructed shear connection from plywood-to-plywood or OSB-to-OSB (face-to-face).
Here's the LONG story:
Our firm performs many Lateral-Force-Resisting System (LFRS) designs for single family residences in Washington and Oregon States utilizing the 1997 UBC.
A standard detail that we include is a shear transfer at the roof eave. This detail transfers roof diaphragm shears to the shearwalls:
Occasionally (more often than we would like) a contractor will ignore this detail. Upon inspection by the local building official (always AFTER the roofing material has been applied) it will be discovered that the nailing through the roof sheathing to the bird blocking has not been completed, then we are contacted for a 'fix'.
The two obvious options we come up with;
1.) Remove the roofing and add the nails, the replace the roofing. This can be very expensive and time consuming, especially if the roofing is tile.
2.) Provide the contractor or owner with a retrofit detail.
Obviously the client never wants to tear the roofing off.
We would like to provide a retrofit detail to our clients for this shear transfer. The retrofit detail utilizes a structural adhesive rather than nails to transfer the shear from the roof diaphragm to a retrofitted wood assembly as follows:
In the past we have specified a 3M adhesive,ScotchGrip 5230, which is no longer available. According to the APA technical note Number Y391C Structural Adhesives for Plywood-Lumber Assemblies, we are looking for a glue that would meet ASTM D4689 Standard Specification for Adhesive, Casein-Type or ASTM D2559 Standard Specification for Adhesives for Structural Laminated Wood Products for Use Under Exterior (Wet Use) Exposure Conditions.
Does anyone have any recommendations of a structural adhesive that would meet either of these ASTM specs?
Jeffrey T. Flansburg, EIT
John W. Parkin Engineering
500 Washington St.
Vancouver, WA 98660
(360) 694-8378 ext. 104
(360) 694-3376 fax
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