inspector already said as long as its over 1/2 inch it will be fine to use but would you all be comfortable with it? 1000sf basement where the two extra bedrooms and family room would be covered in pine t&g instead of drywall (bathroom will have drywall). 100% legal, all permitted, inspected and up to code. theoretically there should be no fire hazard but still, the thought of having all that pine down there should something ever go wrong, is something that has me thinking.
OTOH, if things like these were so much of a fire hazard, there probably wouldnt be people building log cabins.