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Originally Posted by Dave M
"...I live on a hill and I have to walk down a hill and then up the stairs. This is getting old. I plan using pressure treated lumber with 3 boxed frames along the camp and 3 boxed frames out to the driveway. My question is can I use 2X6's for a 7' span...Any other suggestions will be helpful..."
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It does get old. We did the same changeover 15 years ago.
The contractor we hired used 2x8's, which is what I have used everywhere since, as the strength-to-cost difference isn't that much. I use 2x8's for planking as well. They keep their strength better through weather damage and time, and their cost is (or was) only a little more than 5/4ths.
You didn't mention "Trex" planking, whose only negative feature is relative strength, and would require more support (than 5/4ths or 2x8's would) for planking.
Speaking of support, I've managed to use existing Sonotube locations (which haven't sunk appreciably), and would like to hear of any alternatives being used at ground level.
Suggestions:
1) Inspect your sill. This is a better time to put in a PT replacement than
after installing the walkway.
2) If you attach the frames to the house sill, use flashing.
3) Pressure treated lumber is wet and heavy when first bought. Have it delivered now for building in the spring and space each board in storage to keep them straight.
4) Depending on the trees nearby, spacing on the planking can be important for self-cleaning. If the underneath is not accessible, small trees can find the sun through the spaces and become a maintenance item. However, on a long run like yours, you can save a few bucks with wider spacing.
5) I'd modify the existing staircase (rotate it 90° away from the house) so you gain access to the ground in the middle of the walkway, and save even more "steep" steps by not having to go around the walkway ends.
6) Check each board for curvature ("crown" in the trade), and put the "crown" side upwards.
7) Your insurance carrier may specify a handrail arrangement—one different than the design you have planned. (Though my carrier was happy with my design).
My personal favorite construction technique—though it's very expense—is to use ¼" x 4" stainless steel lag bolts on 2x outdoor construction. Changing out the occasional weak plank, tightening for wood shrinkage, and changes in design are more easily made. In bulk, they can be bought for less than $1 each from a few vendors.