Installing a squeak-free sub-floor

A popular application in developing a more solid, uniform floor system is the use of both nails and an elastomeric construction adhesive. The use of Loctite® PL® 400 VOC SubFloor and Deck Adhesive provides a permanent bond within 48 hours and results in a solid, squeak-free floor.

Step-by-Step Directions


Lay the first row of plywood by positioning the "tongues" flush to the outside edge of the floor.


Set the tongues of the second row into the grooves of the first row by using a sledgehammer and a 2x4 wood block. Begin every second row with a half sheet, so that the joints in adjacent rows will be staggered.


When laying out the subfloor, tack the plywood panels in place as you go with 2 1/2" nails, so that you can make adjustments if necessary. Apply Loctite PL 400 VOC SubFloor and Deck Adhesive in a continuous 3/8" bead to the floor joists by using a standard caulking gun. Use a zigzag pattern to ensure that all outer edges and centers are adequately covered. Apply the adhesive to one section at a time and nail completely, both at the perimeter and at the intermediate joints.


  • Loctite PL 400 VOC cures to a super strength bond, yet remains slightly elastic to automatically shim and compensate for wood shrinkage, absorbing noise and vibration, and reducing squeaky floors.