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Old 01-05-2012, 08:49 PM   #16
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Building a deck, attached or freestanding?


if the ledger is properly flashed, via having 12" blueskin behind hte ledger and a metal cap flashing on top of it you'll be find.

now if your in a high wind region and have a freestanding deck your in for problems. im directly on the coast, 10 years ago it was common to see the odd free standing deck around. but in 2003 we were hit with a huge hurricane which trashed half the city. at this point many freestanding decks literally blew away or blew over. because of this codes changed, as of january 2004 freestanding decks are no longer permitted if they are higher than 2 ft off the ground. otherwise they must be attached to the structure via a ledger and the posts must be anchored to concrete piers
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Old 01-24-2012, 11:42 AM   #17
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Building a deck, attached or freestanding?


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if the ledger is properly flashed, via having 12" blueskin behind hte ledger and a metal cap flashing on top of it you'll be find.
Thanks for all the info/opinions guys. I think I'm going to go with an attached deck for the simple reason of cost/simplicity. I was originally looking to have stairs on the deck going down to the ground level (9' off the ground), but I'm going to nix the stairs for cost reasons. The nice thing about a ledger is that I can build the deck with just 3 footings with 2x12 joists, for roughly a 19'x18' deck.

When doing the flashing for the ledger board against the house, is there any specific method/product folks recommend here? I'm contemplating building the deck myself, but the one thing I worry about is getting the flashing absolutely right (for obvious reasons). Thanks!
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Old 01-24-2012, 11:51 AM   #18
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Building a deck, attached or freestanding?


As kirk said the 12" blueskin behind the ledger and then the flashing
Look at figure 2 in this link
http://www.buildingscience.com/docum...drainage-plane

What type of siding do you have?
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Old 01-24-2012, 11:55 AM   #19
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Building a deck, attached or freestanding?


Thanks for that link mae-ling, it's very helpful! I have aluminum siding. I'm not sure if you're looking for a more specific answer..
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Old 01-24-2012, 11:58 AM   #20
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Building a deck, attached or freestanding?


You will have to take some of it off, do the flashing detail, then re-install.
If you had brick or stucco there are other options as well when doing remodelling.
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Old 01-24-2012, 12:29 PM   #21
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Building a deck, attached or freestanding?


Blue skin is a nice product. I used Grace Ice and Water shield behind the ledger, with aluminum flashing over the top. Some pressure treated lumber reacts with aluminum, so you need to check very carefully to make sure that the PT lumber you use for the ledger is not reactive with the metal flashing.

As for flashing details, there are several websites that discuss at length proper flashing detail. I relied on an article in Fine Homebuilding magazine that discussed deck construction in considerable detail, including flashing. The issue is about 2 years old, it may be available on line.
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Old 01-24-2012, 10:11 PM   #22
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Building a deck, attached or freestanding?


For a HIGH deck I would attach it to the house. If you plan to use the space underneath for a patio, additional deck, or even storage, the line of extra posts against the house and extra bracing will get in the way in a free standing deck. Careful flashing with both metal and membranes should prevent any problems, as others have said.
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Old 04-18-2012, 09:50 AM   #23
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Building a deck, attached or freestanding?


Quote:
Originally Posted by mae-ling View Post
As kirk said the 12" blueskin behind the ledger and then the flashing
Look at figure 2 in this link
http://www.buildingscience.com/docum...drainage-plane

What type of siding do you have?
Bringing this thread back from the dead, but I'm finally getting around to building the deck now that better weather is coming around. I have an important question though regarding attaching the ledger board..

In preparation for building the deck, I'm planning things out and have determined there's foam board behind the siding. So it looks like this:

Aluminum Siding->foam board->2x material/rim joist

My question then is, according to this link.. that I attach the ledger board on top of the foam board (in the first picture), or should I cut away the foam board where the ledger board contacts it, and have the ledger board directly contact the existing rim joist? I would think I'd want the wood against the wood, as it intuitively would seem stronger to me, but maybe I'm wrong?

So, I'm debating between:

Flashing->ledger board->waterproof membrane->foam board ->rim joist

or

Flashing->ledger board->waterproof membrane->rim joist

Thanks a lot for everyone's help!

-Mike
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Old 04-18-2012, 10:06 AM   #24
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Building a deck, attached or freestanding?


Yep wood against wood. Cut away the foam board.
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Old 04-18-2012, 10:11 AM   #25
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Building a deck, attached or freestanding?


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Yep wood against wood. Cut away the foam board.
Gotcha, that's what I figured thanks.

Now there's really only one question I have that wasn't covered and just remembered. How do you flash the ends of the ledger board?

I found this article:

http://www.familyhandyman.com/DIY-Pr...iding/View-All

I'm a little unsure of exactly how it works. I understand how to install the "Z" flashing above the ledger board in the "front," and installing "Z" flashing below the ledger board "behind" it (to prevent water from getting into the wall right below the ledger board), but am unsure of how to do the sides. Thanks again!

Edit: Ok, promise last question.. For attaching the ledger board, are carriage bolts or lag bolts any better? I'd opt for lag bolts since they're easier, but are carriage bolts significantly "better?" Perhaps I'm overthinking things.

Last edited by NewHomeDIYGuy; 04-18-2012 at 10:29 AM. Reason: Another question..
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Old 04-18-2012, 06:59 PM   #26
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Building a deck, attached or freestanding?


I have a 10x10 cement slab in my yard . I want to put a roof over it . Just the basic roof. Can I get by with using 4x4 posts for the legs and 2x6 for the framing and 2x4 trusses ? or does anyone have a plan for that they wouldnt mind sharing .
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Old 04-18-2012, 07:17 PM   #27
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Building a deck, attached or freestanding?


Post pictures as you build.
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Old 04-18-2012, 08:50 PM   #28
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Building a deck, attached or freestanding?


Im not building a deck/flooring over the cement slab . I am only building a roof over it . Can I use 4x4 posts for the legs and 2x6 for frame and 2x4 for trusses ?
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Old 04-19-2012, 06:16 PM   #29
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Building a deck, attached or freestanding?


Quote:
Originally Posted by NewHomeDIYGuy View Post
I'm looking to build a deck ~9' off the ground, that's roughly 19'wide and 16' deep/long. Would you choose a freestanding deck or an attached deck (with a ledgerboard)? This is for a townhouse. The reasoning for not using a ledgerboard is really just a concern over time that the flashing might leak and water could get into the exterior wall. Is this not really a huge concern as long as it's flashed properly and I keep up with any regular maintenance?

My concern over many years is if the wood degrads/flashing wears and I develop a leak. Am I simply overworrying (and I should just go w/ an attached design) or is a freestanding deck really the best way to do it? I'm located in Virginia, where we get all 4 seasons. Thanks!

The reason flashing fails is that there isnt enough of it. Most projects would call for 3" flashing when in fact 6" or 8" may be required. And of course the metal you may be using. I remember a project I had years ago with SD Deacon that made us use 316 (marine grad) stainless steel flashing instead of galvanized metal. It was expensive, but there is no such thing as "over" weatherization in Oregon...
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