Exterior Stairs

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BEFORE & AFTER

HOUSE PLAN DETAIL - EXTERIOR PORCELAIN TILE STAIRS

I wonder now and then how many others down all the years had my latest, greatest thought.  And I wonder where it got 'em.  AG

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BEFORE

Porcelain tile exterior stairs in an environment with a 30psf ground snow load and an annual average temperature of 46-dgrees F.  Get this wrong and you could end up like Julian Beever's sidewalk artful bug who's fallen and can't get up.

AFTER

EXTERIOR STAIR DETAIL DESIGN STANDARDS

1) Stairs come with baggage

a) Rise must be reckoned within time-tested rules of thumb and experience

b) Run must be accounted for in taking up space that’d often go to seemingly more useful purposes

c) Matters of width and headroom can vex the best of planned designs

d) Now add natural elements of exterior stairs that are porcelain tiled

i) Nowhere to run away from slope a nonporous surface

ii) Nowhere to hide from tedious calculations to assure equal risers and equally sloping treads

2) What did AG do?

i) Detailed risers and treads in section

Exterior Stairs Detail, Continuous Slope, Section

ii) Detailed risers and treads in plan view (same stairs as immediately above), noting

(1) Extensive construction detail in text, taking particular note of substrate preparation and rebar reinforcement to each tread

(2) Identification of the elevation of each step’s front edge in order to benchmark the changes in elevation from each back of tread to each front of tread; therewith, the back of tread elevation is the immediately higher front of tread elevation less the fixed value of the riser

(3) Of interest in this selection is the reference to Wet COF (a/k/a coefficient of friction) in the .6s, indicating a design standard aimed at benefiting slip resistance

Exterior Stairs, Continuous Slope, View

(4) As background

(a) The little squares on the left are indicative of 5/8 linear inch diameter anchor bolts 4 linear feet on center and 1 linear foot from butts and changes in sill direction with hex nuts and 3 linear inch x 3 linear inch bearing plates

(b) The dashed lines approximate a small section of a large wall enclosing a Courtyard, the angles suggesting a means of stabilizing open ends and re-entrant corners in this Zone 2B site. The Courtyard wall will eventually be engineered

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