08 Jun '11, 4pm

Flashing a window in concrete block (no ext foam insulation, no housewrap) #green

I'm looking around for good detail for flashing a window I'm installing in 12" concrete block (with a 2x4 buck). There's no exterior foam or housewrap there. Do I just extend a layer of Grace Vycor across the gap from the buck to the concrete on every side below the nailing flange, lapped for positive drainage, tape again at the sides and top and leave weep at the bottom, then double up using heavy beads of watersealing adhesive behind trim boards, and foam from inside? That's a whole lot of tape by the time I'm done.... That corner of the house exterior has never seen a drop of water, so I'm not otherwise worried in the least about rain. Am I on the right track? Advice appreciated. Thank you.

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