Before installing the floor, you must ensure that you have a smooth surface. Most Floors will have both a subfloor and underlay, however, to ensure that you have a smooth surface you should place a plywood underlay of at least 10 mm thickness on the area where the flooring is to be placed. Attach the plywood to the floor with glue.
The underlay will need to be nailed down every square foot to secure it to the plywood subfloor. The underlay should be left for 5-7 days to ensure the glue is dry.
Once the glue is dry, use the outside walls to guide where you will place your planks (the outside walls are usually the straightest). Measure together several planks with the width of the recommended expansion gap between flooring and wall. Use a chalk line to outline this distance from the wall. To use as a guide, attach a straight plank between the chalk line and the wall. Using a notched trowel (as recommended by the manufacturer) spread a row of engineered wood flooring adhesive about two planks wide along the straightedge. The amount of adhesive you put down will be determined by the size and spacing of the notches controls. In order to check your trowel's suitability every now and then pull back a board, if it is working appropriately about 80 percent of the glue should stick to the back of the flooring.
Place your first plank on the adhesive, with the groove tight against the straightedge. Set the recommended width of the expansion gap from the wall. Put the end of the next plank close to the end of the first plank and push the two planks together. As the adhesive tends to pull the plank back to the starting point, try not to slide the plank through the adhesive. Keep applying the planks down the straightedge. When you reach the end, cut the last plank to length, ensuring that the proper expansion gap at the far wall is left.
Using a staple gun, staple down the tongue of the first plank tight against the straightedge.
Once the first row is finished you can begin the second row by spreading the adhesive glue into the groove of the plank.
Once the glue is applied, slide the edge of the plank into the first row and staple down the the tongue of the plank to ensure it is tight. Continue along the second row. As in the first, cut the last Work your way down the second row. Cut the last piece of plank to length, ensuring that the proper expansion gap at the far wall is left.
Continue by spreading more adhesive and working your way across the room. Remember to leave the expansion gap between the ends of the planks and the wall at the end of each row. Finish by removing the straightedge you nailed along the chalk line. Finish installation by using a clean cotton cloth to remove the excess glue.