lateral deck stairs vs sloping ground

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Old 04-12-16, 09:20 AM
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lateral deck stairs vs sloping ground

so i am building this deck basically. it's 22 ft total width. i am trying to figure the stairs. they will terminate on the lawn which is level going away from the deck, but side to side it slopes from a total rise of 23" on the left to 26" on the right spanning about 18 ft.. the 23" end is good for 3 rises but the 26" end exceeds the 7 3/4" maximum rise, so 4 rises would be needed. so the question is how to account for this difference. adding in dirt or digging out more to level the ground is out of the question for this large of a span, so i figure i'd either taper it off by doing 4 rises starting at 26" and have the low end have a shorter ( 3 1/2") first step, or go with 3 rises starting from the 23" and have the high end have a extra high ( 10 3/4 ") first step. Of course either way the stair treads would be level when finished. or should I do something else altogether? again leveling the ground is out. Name:  09110515395431.jpg
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Old 04-12-16, 09:23 AM
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Welcome to the forums!

Any way it goes you want the base [where the bottom of the stringers land] to be level. Usually digging out the high side is best but there are times when it's ok to build up the low side.
 
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Old 04-12-16, 09:41 AM
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No way do you want the ends of the stringers just sitting on grade, they will rot out in no time and sink.
At a bare minimum they should be sitting on patio blocks that are sitting above grade and all the top soil has been removed under them.
 
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Old 04-12-16, 10:59 AM
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then why is the 20 year old PT lumber playhouse/swingset that is just sitting on grade not rotted?
 
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Old 04-12-16, 11:19 AM
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It depends on the PT lumber. Some is treated to withstand ground contact and some is not.
 
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Old 04-12-16, 11:28 AM
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Also the playset sees more airflow and dries out quicker.
 
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Old 04-14-16, 06:50 AM
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At a bare minimum they should be sitting on patio blocks that are sitting above grade and all the top soil has been removed under them.
okay so if i go this minimum route, is there any major reason why i couldn't use a plain solid concrete 4" x 8" x 16" construction block instead of pavers or patio blocks? I mean aesthetically they aren't a good choice but in this application they won't be seen anyway and it says the compression strength is 2000 lbs per sq in. and they are twice the thickness. i have some of these from another project. seems like a no brainer but.......

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Old 04-14-16, 06:59 AM
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That is what is under the stringers coming off of my back porch. Stairs were built about 20 yrs ago.
 
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Old 04-14-16, 07:36 AM
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Your first post mentions using different rises... that is not acceptable. Hope that idea has gone by the wayside. On a staircase, no rise should be greater than 7 3/4" tall and no step can have a greater variation than +/- 3/8" from your average rise.

adding in dirt or digging out more to level the ground is out of the question for this large of a span
3" in 22ft is "Out of the question?"

Adding piers or a foundation that is level at 23" from f.f. would allow you to build your stairs. Soil could be brought in to raise the grade as needed, or a level cement pad could be poured, sloped as needed, then grade added around that.
 
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Old 04-14-16, 08:09 AM
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Your first post mentions using different rises... that is not acceptable. Hope that idea has gone by the wayside.
that's not exactly what i was going for, i just didn't word it correctly but the plan has changed anyway so it's not an issue
 
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