It is with all of these things in mind that we have decided to show you what we think are the ten best non-comedogenic foundations. Somewhere in our top ten picks is a foundation that will work perfectly for you and your exact skin type-along with all of the problems that may go with it.
SPAN/LOADING NOTES. Deflection limited to L/360 live load & L/240 total load. Spans based upon a stair limits of 8 max rise and 9 min. run, governing building codes may be more restrictive. Contact National Lumber EWP Engineering for design. assistance on other stair stringer applications and/or loading.
Note that since there is a mid-level landing in this design, the Total Run results do not apply. The Total Run only applies to a single straight run of stairs. The height of each step is 6 7/8 inches. The mid-level landing counts as a step in this design. Both upper stair stringers and lower stair stringers have the same number of treads. It doesn't have to be this way, you can place a landing anywhere along the stair run that serves your needs.