Installation Instructions for Halex Plywood Underlayment

Plywood Underlayment Installation Instructions for Vinyl and Laminate Floor Covering Types:

Step 1


Make sure that the  Subfloor and  existing subfloor are dry, fastened tightly, structurally sound, and smooth. Reset all or remove protruding nail heads.

Step 2

Remove any soft, decayed or delaminated areas of the subfloor to ensure a proper space for the plywood underlayment. Add ring shank nails to any area of the subfloor that squeaks, has vertical movement, or is warped or cupped.

Step 3

Remove any construction debris, paint, caulk, or drywall compound that has built up on the surface. Fill low spots with patching compound; sand joints, high spots, and patched areas until smooth. In new construction, moisture tests of the existing subfloor and the Halex Plywood Underlayment panels are recommended.

Step 4

Acclimating the Plywood Underlayment which can set the Halex Plywood Underlayment panels to acclimate at the jobsite for 48 hours before they are installed. If  there is enough space, separate the Halex Plywood Underlayment panels and store them vertically around the room to allow air passage on each side.

Step 5

Laying out the Plywood Underlayment Lay out Halex Plywood Underlayment panels at a right angle to the grain of the existing subfloor panels. Install all full panels of Halex Plywood Underlayment in position and ensure that the grain of each panel is running in the same direction.




Step 6

Plywood underlayment panels and sheets must be installed at an offset from subfloor edges by at least 8 inches. Plywood underlayment panels should be staggered so that 4 corners do not meet. Lightly butt plywood underlayment panel edges together.

Step 7

Do not pressure  together, but at the same time do not leave any space. . Leave a minimum gap of 1/4 inch and a maximum gap of 1/2 inch between the plywood underlayment panel edges and the walls for expansion.

Step 8

Cut plywood underlayment sheets where necessary then lay out edges to  edge. Install any edges with jobsite cuts towards the wall. Cut the Plywood Underlayment to Make any long straight cuts from the underside of the plywood underlayment panel using a circular power saw with a fine toothed blade.

Step 9

Fix the blade to extend no more than 3/8' inches through the plywood underlayment to reducte the amount of splintering. Make any short or irregular cuts from the underside of the plywood underlayment panel using a power jig saw with a fine toothed blade. Drill any required holes through the face of the plywood underlayment panel.

Step 10

When choosing the the Plywood Underlayment Fasteners make sure to use  plated ring shank underlayment nails with a 3/16 inch diameter head or double coated chisel point staples with a 1/4 inch maximum crown. Then fasten the length to the selected so that the point will not extend through the bottom side of the subfloor. Do not use uncoated, cement coated, or rosin coated fasteners as they may contribute to staining.