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Flashing a Deck Ledger: Keeping Water Out of the Walls

Leaks are common around deck ledgers but may not evidence themselves for years. Leaks lead to mold and rot in the walls and deck collapse. Ordinary flashing doesn't provide complete protection. Learn options for flashing a deck ledger that sheds water and resists even storm driven rain. See what products to use and how to install them for a weathertight connection. Typical flashings that fail and why Wall preparation Using waterproof flashing tape for backup and storm protection Fabricating and installing drip caps Directing water out on top of the siding

Presented by Mike Guertin

Building Safe Durable Decks

Decks are one of the most popular improvement projects that homeowners have added to their houses ­ and one of the most profitable for remodelers. Deck construction is scrutinized by owners and building officials more than ever before, and for good reason. Catastrophic failures in the news and recent reformulations of lumber treatments have raised the level of concern. It is estimated that there is one major deck failure each week in the US where people are injured or killed. Learn the issues, the answers and the solutions to inspire confidence from your client and ensure that your decks will be problem free.

© Michael R. Guertin, Inc. 2006

Flashing a Deck Ledger

2007 Supplement to 2006 IRC (also 2009 IRC)

Table R 502.2.2.1 Footnote `c' "Ledgers shall be flashed to prevent water from contacting the house band joist"

Primary Flashing Materials

Issue: corrosion resistance Copper Aluminum Mill finish Painted Vinyl coated Galvanized Steel

Good ­ Better ­ Best Flashing

Common Details (Good) Housewrap behind ledger Drip cap flashing over ledger Issues: Wall leg height on flashing (not high enough) Drip edge drop on flashing (doesn't drop far enough down. Water can be wind driven beneath. Decking over flashing ­ fastener penetration (fasteners driven to secure the first deck board can penetrate the flashing, corrode and leak. Better Detail Housewrap behind ledger Adhering membrane 6 in. on wall, over joist top, ½ in. down face of ledger Drip cap flashing over membrane [6 in. to 8 in. wall leg. ½ in. down face of ledger] Housewrap lapped over drip cap Issues: Penetrations through ledger can leak through housewrap Best Detail Self adhered membrane applied to wall before ledger 1 in. below ledger ­ lapped onto siding or flap of housewrap (apron) 1 in. above ledger Adhering membrane 6 in. on wall, over joist top, ½ in. down face of ledger Drip cap flashing over membrane [6 in. to 8 in. wall leg. ½ in. down face of ledger] Housewrap lapped over drip cap © Michael R. Guertin, Inc. 2006

Cantilevered Joist Flashing Flexible Flashing seals joist to housewrap / building

Alternative Ledger Attachment Systems

Maine Deck Bracket Deck 2 Wall Spacer Attach-A-Deck Spacer Off the Wall Deck Spacer

Additional Protection for other deck elements:

Joists Posts Beams Metal connectors Use: Self adhered membranes Caps Applied membranes

© Michael R. Guertin, Inc. 2006

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