for a DIY flat deck the boards can be what ever you have, 1" would work, cross sills can be added to strengthen it for thinner boards

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics