I found these weird dirt tunnels running up the support beams in my basement. I poked one and it crumbled, but it looks like they go all the way to the subfloor. Is this serious?

the materials required.

To prevent termites from returning, maintain a dry and well-ventilated basement, as termites thrive in damp environments. Keep woodpiles, mulch, and other cellulose materials away from your home’s foundation.

Regularly inspect your home for signs of termite activity and consider scheduling annual professional inspections to catch any potential infestations early. Installing physical barriers and using termite-resistant building materials during renovations can also provide long-term protection against termites.