Two Good Ways to Keep a Deck Attached to a House
U.S. Government's Forest Projects Laboratory System, developed by researchers at the U.S. government's Forest Products Laboratory, will keep a deck from prying loose—and it will help prevent rot.
Inspecting your own deck
To check the attachment between a house and a deck, go beneath it and look at the main beam: "If you don't see bolts and flashing, it's because they're not there," says Tom Carty, the building director for Peachtree City, Georgia. Adding lag bolts may make the connection more secure, but often either the beam or the house has begun to rot. Carty suggests sticking a pocketknife into the beam and the wall; if the blade penetrates easily, the wood is rotting and the entire deck-to-house-joint may need rebuilding. If bolts are in place but a gap at the joint appears, it could be a sign they are working loose—or were never attached to anything structural in the first place.
Ask TOH users about Decks

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