On Sep 25, 6:46*pm, John Rumm wrote:
wrote:

Proper deck boards are slip resistant especially when traffic is 'across'
the board rather than along its length. *Instead of grooves machined into
the surface, deck boards should have the surface machined away leaving a
series of ribs proud of the surface.

Maybe you could explain the difference?

Mark space ratio ;-)

right


How about alternate tread staircases? *I built one once & my head still
hurts from working it out :-)

Yes, an article on those would be good too. You fancy saying something
about them?

same as cut string at a much steeper pitch really...

Yes, plus there must be various rules for them that are different, and
different pros/cons etc.


NT