In Tennessee we have many basements, so our subfloors are exposed from there. If possible in your home, it’s a great idea to seal wood cracks with construction glue. You don’t need to use the strong stuff however that’s obviously better. A construction crew will tell you it’s a waste of time, and for what you are paying them – it probably is. But homeowners who don’t mind a little DIY can do this, and it has a few benefits. It keeps the wood together, over time wood rots and cracks – this is another connection made in the cracks. Secondly, if you can seal all the cracks you will have much less problems with crawling insects. Ants, spiders, and other pests enter your home in places you don’t even know exist. But if you trace an ant trail in your home to the source it’s always through a crack. Ants cannot walk through walls, although it seems like they can sometimes.
You can get a glue gun and glue in any Lowes, Home Depot, or hardware store. See image below: