Zip R bottom detail
spenceday
| Posted in General Questions on
I remember seeing a sealing detail for ZIP R panels at the panel to foundation intersection. The detail had a piece of treated lumber pinned to the foundation below the panel then the the seam was taped or liquid flashed. I cant seem to find it again. Can someone point me in the right direction?
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Seems fussy. Our preference is to keep the sheathing in the same plane as the foundation. There's a good photo here: https://www.buildingscience.com/documents/building-science-insights-newsletters/bsi-096-hot-and-wet-dry
John,
I agree. The detail only become necessary because they didn't adjust the plane of the framing to compensate for the Zip sheathing.
I am checking with tech contacts at Huber for this detail. I think termination of the bottom course of any sheathing--in terms of flashing and sealing--is a detail often not treated with the import it has to taking all the water load and terminating its management right at the bottom edge.
There are a number of wall termination details here (http://www.huberwood.com/assets/user/library/R-Sheathing_Jobsite_Poster.pdf) but I don't think they comprehensively deal with water and air control layer continuity.
More soon - Peter
The link below will take you to Huber technical library web page with a list of installation details for typical transitions, terminations, and penetrations on ZIP-R panels. I would recommend to check details #1 and #11, cause they probably address your question the best. My favorites in both of these details are Scenario 2 which both give you a little overhang of ZIP sheathing only over the slab edge, which can easily be treated either with tape or liquid flash. It is probably better idea to use a liquid flash over concrete, and protect it from exposure to sun and UV by adjusting the height of base flashing that comes over it. This approach will also eliminate a pathway for pests to chew through the foam, although you will pay the price by loosing few inches of interior space by setting the ZIP-R panel this way.
Hope this helps.
Link: http://www.huberwood.com/technical-library/48/355/360
P.S. Peter, thanks for chiming in on this one.
Spenceday, I believe the you were watching an NS Builders video--about 5 minutes in:
https://www.youtube.com/watch?v=MGk2i4QiU-8
Great detail!
Thanks for the replies! No doubt I saw it on that NS builders video while only half watching and filed it away in my head then forgot where it came from.
I did look at the Huber literature before posting here. I’ll probably use metal flashing in conjunction with liquid flash as the detail.
Spenceday, I came across the "better" NS building video on the Zip R detail. At about the 8:15 minute:
https://www.youtube.com/watch?v=IFdxRNsdcZ0