treated wood products, refer to sfpa's booklet, pressure-treated southern pine (download in publications). back to top . the maximum recommended joist spacing for installing southern pine tongue groove porch flooring is 16 inches on center.
porch decking needs to be prepared and installed properly to get a lasting porch . the wood that was installed on many of the old porches, and the ones i built, had a tongue and groove profile . this will slow water vapor from pouring into the underside of the wood, even though you've treated it.
treated porch flooring- 5/4"x4" - 08';uw5404m(10);ultrawood- treated porch flooring- 5/4"x4" - 10';uw5404m(12);ultrawood- treated porch flooring- 5/4"x4" - 12';uw5404m(14);ultrawood- treated porch flooring- 5/4"x4" - 14';uw5404m(16);ultrawood- treated porch flooring- .
porch flooring is srmilar in sizes, grades, and patterns as the interior flooring described earlier in this booklet. typically, nominal thicknesses are 1' and 1-1/4' (5/4' and 1' actual) with the tongueand~groove pattern, .