Lay spacers along the walls to create the expansion gap specified in the manufacturer’s instructions.
Pour a small amount of glue on the concrete – about the width of two or three boards – and use the trowel to scrape the glue and drips clean away from the bucket.
Hold the trowel at a 45-degree angle and spread the glue – make sure the teeth of the trowel touch the concrete. Continue to spread glue in small sections; you only want to work on two or three rows at a time.
Using the straightest boards, lay the first row along the guideline you created when prepping the subfloor with the tongue side of the board facing toward the room.
Fit the second row’s groove on the first row’s tongue and tap the board into place using a rubber mallet and block.
Stagger the boards at least 6 inches from each end to add strength to the floor. You may have to cut the first board using a circular or miter saw with a blade designed for engineered wood flooring.
When you reach the end of the floor, stop and leave enough space to comfortably exit the room without stepping on the new floor. Wait 24 hours for the glue to dry. If you need to finish installing the flooring, follow the same process until you reach the last row.
Measure the distance between the wall and the board – not the tongue – and subtract the expansion gap. Cut (or rip) the last row. If the boards are less than one inch wide, apply glue to the tongue of the installed boards and slide the last row into place using a pry bar and a piece of scrap wood to protect your wall.
Once your new floor is complete, install transition pieces and remove the spacers. Then nail the baseboards and shoe mouldings to the wall.