Pressure Treated Lumber For Floor Joists

I built a 12 x 24 shed 27 years ago with untreated 2 x 6 joists sitting on treated 4 x 4 runners sitting on solid 4 blocks sitting directly on the ground. Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted. Pressure treated wood is required whenever you attach framing lumber or furring strips directly to concrete or other exterior masonry walls below grade.

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This treated lumber is bolted to the foundation and the floor joists typically rest on it.

Pressure treated lumber for floor joists. Just click here sill plate video. I did have to use 2 4 blocks on the low side. Perry mastrovito design pics getty images. In situations when sistering damaged floor joists with lumber of similar dimensions it can be easy to notch and slide the sister board into place.

Note that pressure treated pine is my building material of choice but can be substituted with naturally durable heart woods from redwood cedar black locust and black walnut. Based on information found in section r317 beginning on page 65 of the 2012 irc book. Yes pt lumber can be used for framing including floors. Learn when to use pressure treated lumber according to the 2012 international residential code.

Also pt lumber is corrosive so connections need to be such that they resist corr. Span calculator for wood joists and rafters also available for the android os. Note that this requirement is only for exterior walls as these may wick moisture onto the lumber. The allowable stresses of pt lumber are lower than non treated lumber which means it can not span as far.

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. Interior walls are within a climate controlled environment and are presumed to be free of moisture. Until a few years ago the irc didn t have deck joist span tables.

Also available for the android os. Take some extra time and jack the damaged area up so that the new lumber doesn t need to be notched. You can watch an informative video that shows a treated lumber sill plate and how it rests on a foundation. The table includes spans for.

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. Treated lumber can be used in applications that are easily maintained or replaced can only be used in applications more than 6 from the ground can only be used when the wood has proper ventilation and drainage see more uses for above ground treated lumber. However doing this does not fix the slant that the floor has taken since the old joists got damaged.

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