(If I’m wrong, I’d get that looked at immediately.) Remember, the post needs to be braced in both directions.ĥ) Finally, to answer your original question: “can posts be stacked and how should they be connected “. California or another active area you wouldn’t have independent footings. I doubt you do, because you say there are independent footings. You now have a carport and the weight of that car on the soil can make the existing footing settle or tip (lean).Ĥ) If you live in a seismically active area there are special considerations that must be met.
#6X6 WOOD BLOCKS CODE#
The Code allows an increase in stress (strength) for impact loads, which your party would qualify for, but there’s a reduction for pressure treated posts too.ģ) We also worry about adding additional loads to existing footings that have “always been just fine”. per square foot to calculate the load, but the Code allows 40 PSF. Depending on the size of your deck, you could easily overload the post at your next birthday party when the gang starts singing Happy Birthday and jumping up and down.
If not, it’s a hinge a a bigger problem develops because it becomes a 30’ post.or whatever the existing post adds onto its length.Ģ) When a post supports decks and other “living” spaces we take extra precautions. I’m also assuming the posts are braced in BOTH directions at the 20’ or 22’ splice. 1 and better, but not a “Select” or a “Dense Select”.) Likewise, a 22’ 6圆 of the same species and grade will support about 7,000 lbs. (AND because it’s outdoors I suspect it’s pressure treated.) A typical 20’ 6圆 of spruce-Pine-fir (SPF) can support about 8,000 lbs. This is called the “slenderness ratio” and depends on the species and grade of wood. You’re right, vertical splices in posts need special attention, especially 1) when the posts are 20-22’ long, 2) when they support decks or spaces where people can gather, 3) where cars can impose “extra” load on old existing footings, and 4) lateral displacement depending on seismic activity or seasonal ground movement, 5) how square the two cuts are made at the splice.ġ) When posts are 20-22’ long they tend to buckle when over loaded.
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