Using Pressure Treated Wood For Floor Joists

Floor joists in crawl spaces are closer than 18 to the ground.

Using pressure treated wood for floor joists.

This treated lumber is bolted to the foundation and the floor joists typically rest on it. Perry mastrovito design pics getty images. Take some extra time and jack the damaged area up so that the new lumber doesn t need to be notched. Until a few years ago the irc didn t have deck joist span tables.

The table includes spans for. Girders in crawl spaces are closer than 12 to the ground. Exterior grade nails can be used but heavy traffic will cause them to slightly flex out and eventually. The allowable stresses of pt lumber are lower than non treated lumber which means it can not span as far.

Use decay resistant wood. Use pressure treated plywood that is attached to floor joists with exterior grade screws. 45 mm 1 70 mm 1 95 mm 1 120 mm 1. Any wood on a foundation wall and is less than 8 from the exposed ground.

Interior walls are within a climate controlled environment and are presumed to be free of moisture. Pressure treated wood is required whenever you attach framing lumber or furring strips directly to concrete or other exterior masonry walls below grade. A floor close to the ground won t last as long using non pressure treated wood. Yes pt lumber can be used for framing including floors.

Cleaning equipment pressure washers vacuum cleaners dryers floor cleaning. Fsc standard kiln dried regularised c16 treated carcassing 220 x 45mm. Also pt lumber is corrosive so connections need to be such that they resist corr. Note that this requirement is only for exterior walls as these may wick moisture onto the lumber.

The ends of wood girders entering into masonry foundation walls with less than 1 2 clearance. The chemicals used in pressure treating lumber including fire retardant chemicals are corrosive to bare steel and could weakend joist hangers potentially leading to collapse during fire. The first piece of lumber commonly attached to the top of a house foundation is often called a sill plate. But the 2015 irc included a new one table r507 5 that will make it easy for deck builders to spec a joist size for a given span and joist spacing.

Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. However doing this does not fix the slant that the floor has taken since the old joists got damaged. Be sure also to use ground contact pressure treated wood for any framing that will touch the ground. Kiln dried treated carcassing 9 width.

You can watch an informative video that shows a treated lumber sill plate and how it rests on a foundation.