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Ok, Went at lunch. Bought a 3x5 piece. Weighed on ups scale at work. 11.4lbs. So it .76 asf. Coosa 15 is .625 asf and 1/2" plywood is 1.50# asf. Next step to see what kind of weight and what spacing it can handle. Coosa is 200 bucks a sheet this 70 bucks. I will let you all know.

This seemed really light. Yes for tile backer but nothing like dura rock or hardi backer. this looked like fiberglass mesh concrete with a foam core. Seemed pretty stiff in store and durable. I might have to just buy the 5x3 for 35 bucks to test it.

Hey all, Newbie here. 1st post. Getting ready to document a 13'9" V-hull build with my 14 year old son. Has any one used Floor and Decor's Sentinel cement foam board for flooring? 4x8x1/2" is 70 bucks and seems like is super strong and really light for the price. I can not find any weight specs...