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I cut diamond shaped wedges from cedar shims and used them along with double sided foam tape to join pieces of foam together:
I then added Great Stuff in the cracks and inside corners to fill in and help hold it together
(I always spray water on GS while it is curing to speed it up, hence the spray bottle)



I then added Great Stuff in the cracks and inside corners to fill in and help hold it together

(I always spray water on GS while it is curing to speed it up, hence the spray bottle)