I appreciate the great comments.
Why would I need to fill at all? 70% of the sill is in tact.I figured some type of covering like paint,polyurathane, maybe tyvec or something to prevent further damage.
It might be dry rot?????? it is only locatd where the wood meets the foundation on the exterior foundation.
I also want to make the wood undesirable to insects.
I want to take opportunity now that everything is exposed.
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