Originally Posted by
Ole Anderson
I just put down 800 sf of floating stranded bamboo click and lock flooring. Of course they wanted an allowance around the perimeter for expansion. I installed it in mid winter with 30% indoor humidity. I undercut the entire dry wall perimeter and installed it basically flush with the drywall, leaving a 1/2" underneath for expansion. I measured an offcut, approximately 5"x5" with my digital calipers at 30% humidity at install and again in the summer at 50% indoor humidity. Not more than a few thousandths difference in size across 5". Two thousandths across a 14' floor (33 boards) is less than an eighth of an inch. I left an inch.