Originally Posted by concretemasonry
That is a very common construction detail and it has been done for decades and to also to provide a good means to provide support and a good construction schedule in all climates.
Normally, it is allowed to provide movement space between the slab and the walls. That is why flexible sealers are used instead of rigid sealers. The cracks is there from the long term shrinkage of the concrete slab over the first year or so. Any change in the slab dimensions (shrinkage and expansion are due to temperature and moisture contents of the slab and the subgrade.
If you have worms, you must have moisture and loose soil around the footings.
Fill it at you choice, but most are never filled.
It is a three years old house. I see thin strand like worms(not earthworm) under cover of cupboard around the walls, some say they are from the door, I am not sure, but the basement is pretty dry, not damp at all.
I bought a can of quckrete grey concrete crack seal, like below, are you saying it is not suit for to use to fill here? any product you can suggest?