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I’ve seen this done lots of diferent ways. I need to know the correct and best way to do this.
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Is the wall brick or wood?The only proper way to make this flashing work is to have the flashing under the siding or tucked and mortared into the brick. There are usually 2 pieces of flashing in this application. The first piece is usually a "Z" or an "L" bend, nailed(go easy on the nails) to the wall and capping the ledger. The next piece is an "L" bent a little taller, nailed over the base flashing.This is your counterflshing and if it is on a brick wall this is the piece that you would need to fold the top edge to slip into the mortar.(After you have removed some) If it is on a wood wall, I will usually run a strip of icegaurd over it to cover any possible gaps and nail heads.I then run my deck over being careful to not screw into my flashing. I also backcut the board or boards that are on top of the flashing to help water roll out.You can also put the counterflashing ontop of the deck but this doesn't always look so hot.Some people may feel this is overkill, but it is the proper way and I have never had a deck fail due to rotted out ledgers or rusted lag bolts.What's a few bucks worth of metal?Reinhard