The drain tile installation includes placing foam insulation on the walls…drilling holes in the blocks…placing the floor edge at the footing…and covering the rock bed in fabric. The first photo shows the foam insulation going up on the walls and the system elements in place on the footings. The silvery stuff is Thermax brand insulation, R-9.8, and flame resistant; it can be used in crawlspace without thermal protection. Joints are covered with foil tape; voids in corner are filled with spray-can foam insulation.
The second photo shows a close up of the water drainage holes drilled into the cores of every block and the corrugated plastic water channel that directs potential water from the block wall into the gravel bed containing the perforated pipe. The corrugated plastic channel sits on the footing and extends out over the rock bed.
The foam wall insulation sits right on top of the plastic floor edge strips holding it in place.
The whole system is wrapped in a gray fabric to isolate the backfill from the gravel bed. The rock bed is being held in place with a temporary wood dam that will be removed as the fill is added.
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