Blue Board is not "new" it's been around for quite a while and is used for "Veneer Plastering" and is not the same as Green Board either, cumon Steve you should know this stuff.
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It seems things change so fast in construction these days, I have a hard time keeping up. Damn when I build a few homes we had a hammer, square, level, chalk line, nail puller, tape, skil saw and extension cord, oh yeah a pencil. Never used a crane, we used ropes and pulled the trusses up by hand. These days they got made with all the new stuff. Yeah I'm old,,,,,,LOL.
Wow looking good!!!