Question:
I have a new home built that needs a nice new patio. I will be
placing a hot tub on this deck and have been told that it requires at
least a 90lb. per sq. ft capacity. Many deck people in my area claim
theirs will hold 100 - but deck plans I see in books often say 40-60.
What makes a deck hold more than others?
Answer:
I would layout the whole deck using the standard tables for span of
your choice of wood. Doubling( 2x8 or 2x10 )whatever the table calls
for is a good start under the tub side. Use double joist hangers for
side by side joists. Full size hangers a must not the 2x6 hangers a
lot of people get by with. 12" on center will gain even more strength.
A deck is not rated for snow load when it doesn't have a roof. Your
tub is somewhat of a snow load. The footings have to be enlarged.
In my area all roof footings must be 18" in diameter because of punch
through. That is where a round footing under load just pokes down into
the ground.
These are rough ideas to get you going. Good luck.
