After you've determined your decks design bolt spacing, it’s also important to make sure the ledger board-to-house connection is watertight. You’re not going to be smiling if you go into the basement a month after the decks design is finished to find black mold starting to form where water is getting in.

A good decks design flashing detail will ensure you’re house is leak free and will prolong the life of your deck. Ultimately, none of this is rocket science, but you’re going to be wishing a big rocket would fly down and blow up your decks design when you discover the ledger board pulling away from the house and/or a nasty water leak. Read this section and get your decks design right.

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