Originally Posted by GBR in WA
If no sill sealer there, use either-or. Some bugs go through foam after crawling under the p.t. sill plate because the concrete sub never rodded (scrapped smooth) the top of the wall after pulling the forms.Or they "hand" troweled the wet concrete rather than using a float tool. Or the p.t. plate dried out and cupped and bowed up between the required spacing of the fasteners. The moisture will still come through as long as contact is made without a sill sealer: http://www.greenbuildingadvisor.com/...-building-code
Thanks for link. Haven't checked it out, but will. No sealer on the sill. House built in '56. Not that well maintained either which puts me in a continuous state of DIY projects. Upon further review, I'm not even sure the gap between sill and block foundation is wide enough to make foam a good option. Think I'm just going to fill the big gaps with scraps of rigid foam and caulk the perimeter, but will use foam around the rigid foam I'm putting in the box. Understand the insect conern though.