I am building a deck (12' wide) and see that deck boards (at least when perpendicular to the house) should be sloped away from the house so water will run away from the house. Seeing numbers for the slope from 1/8" to 1/4":
- per foot
- per three feet
- per twelve feet
- per (unspecified)
Is there a 'correct' value or range of values as such? What makes it correct?
Does it vary based on (what) conditions?
Perhaps a higher slope for composite decking that tends to sag?
Note: a one degree slope would be 0.209" per foot.