hi- i am building a small shed and don't want to use pressure treated wood
for the joists, as they will be close to the ground and i don't want my kids
to be around them. if i use cedar joists on cinder blocks will they hold up
for a reasonable amount of time?
Couple starter questions: what kind of cedar; how large a shed; how large (
length, width, thickness) will the joists be; how are your kids going to get
under the shed to mess with PT joists?
I don't know of any span tables for Eastern red cedar, but it is stronger than
MOST other American cedars (not all, but it is readily available, etc.). It is
still quite weak.
Or are you writing of ceiling joists? Same story there, of course, except that
there is no need for PT or cedar unless the ceiling is rather poor.
"If a politician found he had cannibals among his constituents, he would
promise them missionaries for dinner." H. L. Mencken
Wise move. I'd go with larch (because it's local) or eastern red
cedar. I'd avoid western red cedar. The US Gov forest products
handbook (which is downloadable) has more strength information than
you're likely to ever want.
Die Gotterspammerung - Junkmail of the Gods
If close to the ground is an issue, I'd prefer the cedar to the
larch - better rot resistance and insect resistance.
My garage has WRC joists - on a 50+ year old house. Lovely red colour
I do not recommend cedar if it will be in a wet condition or in contact with
the ground. It will rot in those conditions. I am currently building a
storage building with PT lumber and while I do not have any young kids
around, I am going to cover all the exposed PT lumber with Hardi Plank
siding. You might consider the same tactic.
Use the pressure treated lumber. It will be hard for the kids to come
into contact with it since it will be covered with the floor.
Besides, cedar is just not appropriate for floor joists. It's too soft
and too expensive to use for that.
Cedar will be either 2nd growth and not very long lasting, bug
resistant or strong or old growth and you will have to sell the kids
to afford it;>(
Best compromise is to use pt wood and wrap the perimeter with a skirt
board over the pt. Once the wood is in place out of the elements it's
pretty stable. Of more concern is the sawdust and scraps from
construction. You might have the pt joists pre cut to length at the
lumber yard and just nail on site.
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