Home Improvement Questions? Ask a Handyman for Answers
Hi. My fist guess would be Powder Post Beetle: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7418.html
Those usually get in with the woods comming from non treated lumber. Humidity will activate them, so they might come from that patio and extended to all the house. they are really hard to erradicate and require the help from a pest management technician.