Thin brick over polyiso. Window details?
1-4-19 12:05pm MT
The owner of the company reached out to me and there are some clarifications:
1.) The product is EXPANDED polystyrene not extruded. So it is permeable at the appropriate thickness.
2.) DOW 790 and BASF NP-1 are approved sealants
3.) Tyvek stucco wrap (drainwrap) is recommended as the WRB for mechanically fastened systems. Borrowing some research on EIFS they determined the drainwrap would suffice for moisture release.
4.) Their liquid applied barrier is recommended as the WRB if the panels are applied using their adhesive product. No primer required, 20-mil for wood substrates and 10-mil for Densglass.
I was highly impressed after speaking with the owner and the thought behind the product. I will update this thread once it’s installed.
I’m looking at a thin brick application. Photos attached (although the installation looks incorrect). This particular brand is fastened using a 1″ XPS panel with a “moisture channel” on the back. I’m uncertain of the utility of the moisture channel as it relates to window installation
The wall stackup:
2×6 with R21 batt
2″ polyiso (windows flush and flashed with this layer)
1″ XPS brick panel
Should a slight gap be left when butting the brick and panel up to the window (to allow ventilation of the moisture channel) along with a metal sill? Or should the gap be caulked? I’m also considering installing the windows flush with the zip layer, extending peel and stick over the iso, and using metal jamb extensions as the trim. I’m just not sure what further detailing I need to or if the moisture channel is useless. Any other installation recommendations would be appreciated.
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