I recently bought a house with a deck and although its in good shape,
to my surprise I discovered that the rafters are 24" apart instead of
the usual 16". Is this an alternate way of building decks or did the
person who built this deck take a shortcut?
Seems to me that the spacing would depend upon the decking material and the
loading expected. For example if the decking was Trex or one of the other
synthetics then 24" would be unthinkable. On the other hand if the decking
were 2-by material then I wouldn't have any problem accepting it. If the
decking were 5/4 material and the expected loading was light it would
probably be fine too although it leaves less margin for the time when the
material begins to deteriorate years down the road.
Technically they are referred to as _ joists_ not rafters. Local codes
vary, but around here the code is: 16" O.C. (on center) for 5/4" x material
decking. When using 2" x material decking you can go 24" O.C. with the
joists. This is for wood products, I'm not familiar with the man made
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