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Old 10-17-2010, 09:38 AM   #1
Tony
 
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Suggested Subflooring over pressure treated decking


I have a small (500 sq ft) A-frame near a local lake. A few years back I constructed a new 14x16 deck on the front of the cabin. Now I want to add on to the A-frame by converting the deck into a room. I'm in discussions with a local Amish carpender and crew to frame and roof the addition.

The deck is constructed with 2x10 joists, on 16" centers, spanning 14' perpendicular to the front of the building. The decking boards are 16' in length and run parallel to the front of the building. The decking boards are in excellent condition, firmly attached to the joints with ring shank nails and are not warped.

The question is around the subflooring installation. Can the 4x8 subfloor be installed directly over the existing decking? If so, any special technique? Would 1/2" be sufficient?

The anticipated finish flooring will be 3/4 hardwood.

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Old 10-18-2010, 01:36 AM   #2
STRUCTURAL
 
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Suggested Subflooring over pressure treated decking


Everything you write that you want to do with the deck is fine.

There are more critical issues with putting up walls and a roof above it. You do not provide enough information on existing beams, posts and foundation to determine if they are sufficient for what needs to go on top.

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Old 10-18-2010, 01:45 AM   #3
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Suggested Subflooring over pressure treated decking


As before.
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Old 10-19-2010, 06:47 AM   #4
Tony
 
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Suggested Subflooring over pressure treated decking


Thanks.. Additional information follows:

All lumber is pressure treated. No beams were used. Dimensions are 16' parallel with the existing structure and 14' perpendicular to the structure. Across the 16' ledger away from the structure, there are (5) 4x4 post. The posts are evenly spaced across the 16', are installed approximately 24" below grade, with Quickrete fill to within 6" of grade. No formal concrete footers. Across both 14' sides, there are (3) 4x4 posts at 25%, 50%, 75% the length, not including the shared corner post. The ledger and band borads are 2x12. One ledger is attached to the existing structure with ~10 1/2 lag bolts. The second ledger is attached to the 4x4 posts with (2) 1/2 lag bolts per post. The side band boards are attached to the 4x4 posts with (2) 1/2 lags bolts per post. Joist hangers are attached to both ledger boards on 16" centers. The joists are 2x10x14 and run perpendicular to the existing structure.

Hopefully, my explanation is clear.

Thanks

Last edited by 112690; 10-19-2010 at 06:50 AM.
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