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Old 04-24-2012, 11:28 AM   #31
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Adding 16.5" to length of deck, sistering 2x6


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like this....say the red v's are the glue?

Yeah, that's the jist of it. You can put them closer together; just a 2-3 inch gap between bottom tips is plenty for water to run out.

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Old 04-24-2012, 11:30 AM   #32
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Adding 16.5" to length of deck, sistering 2x6


Damn the torpedoes.....Stop talking and start sistering. Go as long as you can for the back-span part of the sisters, use the tip on the adhesive, mind the staggered bolt or nail pattern and measure twice cut once.

Post a photo or two when completed.
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Old 04-24-2012, 11:41 AM   #33
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Adding 16.5" to length of deck, sistering 2x6


Yes I apologize for being short but I didn't initially come here to ask if I should rebuild my deck with 2x8 or if I can cantilever an additional 16.5" but rather the correct way to sister joists when a cantilever is involved. I know adhering to the code is important and I do want to do that.

So from now on, I will speak theoretically, as if I was going to do this but not actually doing it (thereby not breaking any codes).

On a serious note, if my deck did (theoretically) have 2x6 joists, will I be forced to tear it apart if I had a building inspector come over? If it is old construction, would it be "grandfathered" past the current building standards today? Furthermore, could monetary fines be imposed if it was discovered that it is using 2x6 joists?
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Old 04-24-2012, 12:59 PM   #34
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Adding 16.5" to length of deck, sistering 2x6


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On a serious note, if my deck did (theoretically) have 2x6 joists, will I be forced to tear it apart if I had a building inspector come over? If it is old construction, would it be "grandfathered" past the current building standards today? Furthermore, could monetary fines be imposed if it was discovered that it is using 2x6 joists?
Assuming,
  1. it was built to code at the time
  2. a building permit was issued and the work inspected
  3. you are not making any modifications
Most state level enabling laws limit inspections to "new work". There are exceptions to that rule depending on your location and the type of building (single family, multi-family, mixed use, etc). If you let us know where you live so one may be more familiar could help.

In some cases parts of the building codes can be adopted in other parts of the law. For example, MGL requires all decks higher than ____ inches to be surrounded by an approved railing. If you had previously (to the law taking effect) built a deck without a railing, you would be required to add a railing or tear it down.

My town past a general H&S by-law requiring all in-ground and above ground pools must be surrounded by an approved fence and gate.

Some actions are triggered by an event, such as, when a house is sold or permitted electrical work performed, hardwired fire detecters must be installed and inspected.

The "codes" define current best safety practices. It is up to your State, Province or local authority (LA) to adopt, interpret and enforce them.
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Old 04-24-2012, 01:02 PM   #35
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Adding 16.5" to length of deck, sistering 2x6


I'm in Ontario Canada and there would have been no need for a permit when the deck was built (although one may have been pulled, I don't know), because the deck is under 24" from grade and not attached to the house.
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Old 04-24-2012, 02:31 PM   #36
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Adding 16.5" to length of deck, sistering 2x6


so its a floating deck.... even worse.. i can see this going bad.. .
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Old 04-24-2012, 03:28 PM   #37
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Adding 16.5" to length of deck, sistering 2x6


Why? Do you think my joists are floating on the beams? Or the beams are not attached to the posts? Or the posts are not attached to the footings.

Joists are 16' long secured across 3 beams which are secured to 9 posts which are secured to 9 footings. I don't see why it would go bad if it is floating as compared to secured with ledger? It isn't going to "tip" over with excess weight on one side...
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Old 04-25-2012, 07:34 AM   #38
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Adding 16.5" to length of deck, sistering 2x6


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Old 04-25-2012, 07:36 AM   #39
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Adding 16.5" to length of deck, sistering 2x6


Yes I know, I was asking why the poster above me thought that made a difference as opposed to being attached to the house. The deck is essentially 1 piece, everything is attached, screwed, nailed, bolted together and whether it is floating or attached to the house, it is solid.
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Old 04-25-2012, 07:42 AM   #40
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Adding 16.5" to length of deck, sistering 2x6


Nick...could you post a photo of the deck as it exists now. Show an overall view and maybe a close up of the cantilevered section?
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Old 04-25-2012, 07:44 AM   #41
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Adding 16.5" to length of deck, sistering 2x6


Sure, will have to wait until I get back to the house but can get some after that.
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Old 05-01-2012, 06:42 AM   #42
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Adding 16.5" to length of deck, sistering 2x6


Caught an episode of Holmes on Homes the other night called "A Pane in the Glass". Topic was about an improperly installed bay window that had no support under it. The crew removed the window and sistered new joists to the existing joists to make a cantilever for the window.

Couldnt find the episode on line anywhere.
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Old 05-01-2012, 07:01 AM   #43
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Adding 16.5" to length of deck, sistering 2x6


Couple of issues I see are first the 2x6 joists are a little light for the span is the 16 foot with the 9.5" overhang only supported by one beam and the ledgerboard on the house? If so here is what I would recommend first double check the ledger make sure it is bolted or lagged to the house Look in the basement to make sure they are installed properly. Next I would use 2x8x8 and notch them around the outer beam glue and carriage bolt every 16" with an additional backer block on the opposite side. I do have one question and concern that may change this recommendation why do you need the additional 16.5" ? if you are installing a bench that will ad weight to that edge I may rethink the issues and consider adding an additional beam at the outer edge and eliminate the canter-lever all together at that point I would go beck to 2x6x8 and glue and bolt so the deck does not have any walking issues with the added piece. Please keep in mind that a on a deck when people gather they have a tendency to gather at the railings this adds a concentration of weight in this area greater then on the rest of the deck which is why I would really want to check the other end of the Joists to see how well it is anchored.

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