Flashing Deck Ledger Pic

Swanny

If you don't want to worry about water sitting in the notch just tape up the notch with membrane before bolting the beam in. A run of membrane on top will keep water out of the lamination as well.

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RobertCDF

For those who think sandwich beams are a good idea try this to prove a point.

1. Take 3 sawhorses and 1 12' 2x4.
2. Mark 12", 120" and 123 1/2" on the 2x4.
3. Set a sawhorse under each mark.
4. Apply a direct load to the center of the 2x4.
5. Watch as the 2x4 only rests on the 12" (end or ledger) and the 120" mark. Skipping the 123 1/2" sawhorse.

This is of course more drastic than the real thing but the concept is the same. All joists are going to bow slightly in the center of its span when a load is applied. Plus nailing 2 members together is stronger than 2 members close together.

__________________
Robert Shaw
Colorado Springs Custom Decks
Colorado Custom Decks
Custom Composite Decks

B. Whitmore

Hi gentlemen,

Sorry to resurrect an old thread, but I came across this discussion while searching for a good deck flashing diagram.

I am still searching for a good construction detail showing the termination at the ends of the galvanized sheet metal atop the ledger. What I am hoping to find is some type of detail that includes a sheet metal end dam, so that water can not run sideways and seep into the wall at the outside ends of the ledger. (such as you should see with a brick veneer detail).

If anyone is interested, the American Forest and Paper Ass. has published a based on the '09 IRC. I am unable to post the URL since I am a new poster.

concretemasonry

B. Whitmore -

The flashing and moisture durability problems will never go away.

A ledger installation is always asking for problems down the road.

__________________
Dick

Engineer, designer and consultant recently active domestically and internationally on construction and design in about 35 countries.

B. Whitmore

A free standing deck would be ideal in most cases. ( shear, rot, etc.)
When specifying repairs, I like to provide diagrams showing best practice.

Morning Wood

If the deck has no trim on it, you are sort of stuck to having a visible flashing. Why not just cap the end of the ledger with more ledger flashing?

B. Whitmore

My concern is not with the finished look, but with the outside edges of the GSM flashing that sits atop the ledger board. With most horizontal flashing, it is supposed to be installed with a slope for proper drainage; in the case of a ledger, this isn't really possible. Water can run in at these outside ends, which is a weak point in the system. I'm hoping for an end dam detail, or something similar I can provide to the installer (may just give him an end dam detail drawn up from BIA.org showing a brick veneer end dam and tell him to copy). I would post a picture/ diagram to help explain my concern, but I am required to have a min. of 15 posts on this site in order to do so.......