[GSBN] Plaster detail at Bale/Plywood Interface

Bruce EBNet bruce at ecobuildnetwork.org
Mon Nov 17 16:38:56 CST 2014


There WILL be a crack at that joint.  Flash & detail for it, don’t be in denial.  Articulate when you cannot hide.

Thanks,

Bruce “Been hiding out too long” King





> On Nov 17, 2014, at 2:26 PM, Ian Smith <ian at lopezsmolensengineers.com> wrote:
> 
> Hi everyone,
> 
> I'm currently helping with the design of a one-story SB house with a rectangular footprint and a simple shed roof.  The SB walls will be constructed with a wood bond beam that's in the horizontal plane around the whole perimeter of the house, supported on wood posts.  Prefabricated wood trusses will then bear on top of these beams.  The trusses will have a "right triangle" shape to create the shed roof and a flat ceiling on the interior.
> 
> On the higher side walls of the trusses, the owner would like to have plaster continue all the way up to the underside of the roof (actually, to the underside of the roof sheathing), with minimal trim/flashing, etc. at the interface/transition between the straw bales and the plywood.
> 
> I've already mentioned to him that there's the possibility that that plaster will crack at this interface (due to the differences in substrate material, plaster thickness, etc), and I've suggested that there be a control joint in the plaster, or a piece of trim with flashing or something.
> 
> I'm just wondering how the rest of you prefer to deal with this detail...
> 
> Thanks very much,
> 
> Ian Smith, P.E.
> Boulder, CO, USA
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