Avoid Disasters: How To Properly Flash A Deck || Dr Decks

I've seen so many examples of deck rot because some carpenters don't flash their decks. It's relatively simple and inexpensive to do and will save you tons of money in repairs in the future. In this tutorial I'll go over the best ways to do it to keep your deck, and your home, waterproof.

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#drdecks #deckbuilding #diy #homeimprovement #howto #tutorial #howtoflashadeck #waterproofdeck #howtoflashahouse

[pennybergmen]

You’re very generous to share what you know to so many people!

[pcatful]

Thanks! Great variety of approaches shown! Alternately I prefer to leave the deck ledger spaced off the wall and let the wall be the weather barrier instead of interrupting the weather barrier. I like how you use of flexible flashing bemeath the metal flashing. The metal protects the flexible flashing from UV and secures it better. The flexible flashing at the top is good as well for remodel to make sure the weather barrier is continuous. There's always differences, whether this is new construction or deck addition, and what the siding is. Your decking board will be going parallel to the wall. I"d notch the first board at intervals on the bottom so the water isn't trapped at the flashing.

[alamedajon]

Informative good video, I'm subscribed. I am about to pull a deck away from the wall because of rot. bracing first, the deck is at a height of 7 ' no bracing under the deck. It was attached to the house. I'm hopefull the wall above will not crumble as i need to reclace a 4x6 x 12' header.

[deeparker]

Just the video I needed, in the UK we usually have brick exterior walls, but just replacing a deck on a timber building and the person who built it in 2010 didn't flash it so the OSB sheathing and about an inch into the joist behind it had rotted, can't really find any profiles like you have but I'm going to rip a square section of UPVC downpipe along its length to create the profile. Great tips, thanks.

[brentdreamer]

The perfect video for my deck project. I am building a log cabin and the deck is mostly covered by the extended roof but I learned quite a bit about styles of flashing in addition to the tape I am already using. Thanks again and keep the videos coming Jason.

[jeremysawesome]

Much appreciated! I'm working on a deck project right now and just finished flashing the ledger, this just uber boosted my confidence that I'm doing it right. I'm very curious about that next video you mentioned in which you re-trim/side over the waterproof membrane, that's likely going to be something I have to do soon.

[knoxsonclips]

Absolutely love your stuff, watched hours of them for advice on composite and PVC installs, but at least 1 3/4" on the flashing to provide a capillary break. That way the water will not drip down the ledger

[frankcampos]

I’m planning on building a pergola with an attached ledger board to the side of my house that has a bay window with vinyl siding. Do you have any suggestions or videos on how to seal and waterproof around the ledger / vinyl siding?

[Sparisland]

Don't forget to flash the top of the siding below the ledger because water will run down the front, along the bottom, and back under the siding if you don't. Even if you think the flashing above the ledger extends far enough, the wind will blow drops of water back against the ledger board.

[jason]

Dr. Can you use membrane tape over tyvek or should the membrane go directly on the wood?

[jbthefirst]

About to do this for my own deck. Thanks for the video!

[cleanearthhaulingjunkremoval]

This is great to see. I want to ask how you would flash a stucco wall? Remove stucco where the ledger is to be installed and flash or leave the stucco and caulk the lag screw holes? Your input is greatly appreciated.

[Toprankedpdx]

Also any pro should address flashing down the end grain (sides) of the ledger. Also rabbeting the out the back of the bottom of ledger is a good idea to lap the siding which prevents surface tension and water running behind siding.

[nettle]

When the deck board closest to the house, especially if it runs parallel, gets screwed down it doesn't leave an exit for the water to trickle down in between the flashing. I find this odd to be common practice and up to code, especially if the siding comes right down to meet the deck boards. "Deck2wall spacers" seem like the best option out there to leave breathing room for drainage and debris buildup.

[johnnynewburgh]

Why don’t they add a couple of more 4x4 posts and keep ledger independent of house and leave 1/2 gap

[jjtrades]

I never use aluminum, the chemicals in the pressure treated lumber will eat the aluminum. I use nervous-straw (not sure they even make that anymore) but it's a vinyl sheet flashing like rubber and comes in 1ft out 2ft rolls and I use the whole width. I go 6" up the wall and a foot and a half out onto the joists so the ends of the floor joists also don't rot

[didster]

Sorry if it's already been asked but how do I flash a new ledger board going against an existing stucco wall?

[marcellinasfigaro]

I watched a couple of other flashing videos and they installed ANOTHER piece of Z flashing besides the one that covered the ledger board, that was L shaped and also went behind the siding and sat ON TOP of the decking itself probably a couple of inches. Seemed like overkill to me. What do you think?

[joeltrotter]

Don’t the chemicals in the pt eat through the aluminum flashing? Same thing with galvanized. I always use thin rolled copper.

[dcole]

I've used weather tape, flashing and put roofing paper across and down the ledger for even extra protection for the house and ledger.