I'm rebuilding my wooden porch stairs, which aren't covered, so I'm thinking about the details for proper shedding of rain water. A couple questions:
Is there any problem with sloping the stair treads 1% downward from back to front? I'm wondering if that would be a safety issue, as far as people slipping off the stairs. Sloping side to side doesn't work for me, as stairs are captive between a knee wall and the house.
Second, what's the best way to handle the tread/riser intersection to avoid trapping water? I've been thinking of running each riser behind the tread in front of it, and then leaving an 1/8" horizontal gap between the tread and the riser. Not sure if this is a good idea.
Here's a couple more details, in case they are important. Beneath the porch and stairs is a ventilated crawl space interconnected with the house crawl space. The porch is surrounded by knee walls and the house on three sides, so the porch deck is sloped 1% towards the stairs for drainage.