I've started installing engineered maple that is 5" wide. I am using the nail down with glue assist method recommended for wide flooring pieces. My question is since I am installing my flooring in the winter time and it is mostly contracted, do I need to install it with an intended gap between the flooring pieces. I'm already accounting for the perimeter with a minimum of 1/4'' gap. I am concerned about buckling in the summer time. I have already installed the first row and the space between the flooring on that row is pretty tight. Hopefully I don't have to rip that up because I doubt I can salvage it since glued and nailed. Side note but due to very low temperatures recently, I purchased a humidifier to try to get as close to the manufacturers recommended relative humidity range between 35 and 55%.