Had our handyman install this on the wall behind our bed in the Master bedroom. He had issues along the way with planks that were slightly bowed. He went thru all the boxes to take out the bowed ones to use last and towards the bottom of the wall. He used a little glue on the back of each plank and then a nailgun. Our wall was already a tan color so in gaps in between the planks here-and-there are no big deal. We love the end result - just wish there had been more of the darkest planks (we had 15 boxes and the darkest planks were few and far between) and less bowed ones.