Flashings

Best Practices: Decks - Flashings


DFLeavitt

This is a bonus section of the “Best Practices” pages on this site. Flashings are NOT specifically addressed in the JLC series, so I thought I would create my own version of what should have been part of the article. The 2012 International Residential Code has several important references, but many more details can also be found at the exterior cladding manufacturers as they give specific directions as to how to integrate the deck with their cladding.

2012 IRC

R507.3.3 Flashing.

Flashing shall be corrosion-resistant metal of minimum nominal 0.019 inch (0.5 mm) thickness or approved non-metallic material.

R507.9.1.1 Ledger board to band board.

A ledger board shall be attached to a nominal 2x lumber band board with ½ inch (13 mm) diameter lag screws or through bolts with washers at a spacing specified in Section R507.9.1.4 and as shown in Figure R507.9.1.1. The exterior finish material shall be removed prior to installation of the ledger board. Flashing at a door threshold shall be installed to prevent water intrusion from rain or melting ice and snow.

 R507-9-1-1

A big issue is the flashings used at a deck to door threshold. Look at the IRC definition for “Pan Flashing”.

Def-Pan-Flashing

Let’s take a look at the general flashing requirements found in Section R703.

R703-8A

R703-8B

R703-8C

 

 

 UNDER CONSTRUCTION - PLEASE RETURN BACK SOON

 

WHAT ARE YOUR THOUGHTS THESE BEST PRACTICES?


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