No, you don't "have" to use p.t.(for the last 37 years, maybe longer)- there are other woods available for slabs, #3: http://publicecodes.citation.com/ico...9_3_sec017.htm
"Naturally durable wood": http://publicecodes.citation.com/ico...9_2_sec002.htm
Notice- it has to be "heartwood", not sapwood: http://www.wrcla.org/cedar_benefits/...cteristics.htm
Even with a sill-sealer under other
wood (not decay durable), it may not pass. Check locally. If recent construction, poly is required per Codes under a slab, but you would have to prove
that it is present to the Inspector when using standard wood plates on concrete.....
The sill sealer is for a capillary/thermal break to the cold concrete touching earth unless it had a foamboard layer per location when the slab was pored. http://www.greenbuildingadvisor.com/...-building-code
P.S. Welcome to the forums!
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!