2x6 decking questions


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Old 03-17-14, 03:10 PM
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2x6 decking questions

Good afternoon,

Long time lurker, first time poster. I have a problem that I'm hoping to gain some insight to a solution. The first of course being located in a remote location in northern BC (Canada) where my frostline extends >72in. Solved that problem by going with a 12ft, 12 inch dia helical pile

Overall deck structure is 16x16 (top) and 10x18 bottom deck. Using the traditional ledger board to the house (2x8), 3 piles 7ft from house, (6ft centres) 3 more piles 14ft away from house, also 6ft centres. Structure, 3x 3x8 beam, and can either go 2x6 or 2x8 joists (16in on centre). 2x8 ledger. Beam supported by 6x6 post to helical pile (welded bracked)

Lower deck 3 piles 7ft centres, 8ft from house. 3x 2x6 laminated beam, with 2x6 joists (16 in on centre). 2x8 ledger

Problem with the lower deck is a height constraint. I only have 13 inches from ground to bottom of a sliding door. Leaving my 1in of clearance for flashing, I'm down to about 12 in. I'm trying to minimize any bounce and will be blocking at 4ft from house.
-Should I go with 2x6 joist doubled up ever other joist
-2x8 joist over tripled 2x6 beam.
-2x6 joist over tripled 2x8 beam.

I'd add more piles but at a cost of $250/pile the costs add up quite quickly.

Also wood it P/T Spruce/fir
 
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Old 03-18-14, 12:23 PM
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Can anybody offer input? General thoughts etc...
 
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Old 03-18-14, 01:24 PM
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Welcome to the forums!

The carpenters are probably all out working but should chime in later today. While I've built a handful of decks, I mostly just clean and stain them
 
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Old 03-18-14, 03:32 PM
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I read the post this morning at 5am, and knew there wasn't enough coffee in my system to give a good answer.
Are these decks directly over each other or offset? Do you have a sketch up you can post so we can get a handle on it? 2x6's will span your 7' span just fine . The 14' span puts you up to almost 2x10 territory.
 
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Old 03-18-14, 05:36 PM
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Offset, 32 in difference in height between the two with stairs. Sketch sorry I don't, i've attached the layout of the yard. Left side is lower deck, dots are piles. I'm spanning the lower deck 8ft from house with 2ft overhang. Upper deck has 2 sets of piles, 7ft and 14ft from house, still only 7ft.
 
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Old 03-18-14, 06:22 PM
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OK, that's good. I was trying to envision how you were supporting the upper deck "through" the lower deck at different pile spacing. Your drawing helps. So your lower deck is the one with height considerations, and it is only 8' wide from the house You will be OK with 2x6 lumber, even doubled if you wish for stability. Use proper joist hangers and fasteners. How deep is your beam on the lower deck? If more than doubled 2x6, it may encroach on your door height, and you don't want snow in the door opening. This is my fear in your location, 'cause I am sure it doesn't stay balmy all year long

Your upper deck will definitely fall into the 2x10 category due to the length of the total joist system in order to keep bounce down to a minimum. Remember you can't cantilever more than 2' past your last beam, which I see you plan on.
 
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Old 03-19-14, 11:00 AM
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Beam on lower deck will be triple 2x6's at a min, just wondering if height permits if I should go with a thicker 2x8 beam, or 2x8 joists. And yes snow height... Ideally I would like to see 2-4 inches below the door and deck, but I don't have the room.

You figure 2x10's for the upper deck eh? I would think that due to the largest joist span being 7ft, being supported at the ledger board, beam 1 @ 7ft and beam 2 @ 7ft with 2ft overhang that 2x8's would be all thats needed. Its not a big deal going to 2x10's but just interesting info.
 
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Old 03-19-14, 03:18 PM
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You know, I read your first post and the 14' stuck in my mind. I now realize it is 14' from the house with a 7' beam between. You will be fine with 2x8's supported by the beams set as you indicate. Sorry for the confusion.
 
 

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