Underlay For Resilient Flooring

When the subfloor is not constructed as a combination subfloor and underlay type as described in the chapter on Floor Framing, an underlay should be installed under resilient flooring or carpets.

Plywood panels >/4 in. (6 mm) thick are commonly used, although particleboard in the same thickness is also used. Ensure that the particle-board is approved for use with the finished flooring material by checking the manufacturer's installation instructions. The panels are attached to the subfloor with annular grooved nails spaced 6 in. (150 mm) apart along the edges and at 8 in. (200 mm) on centre both ways over the rest

Application of strip flooring: (A) general application; (B) laying first strip; (C) nailing method; (D) suggested method for setting nails.

Application of strip flooring: (A) general application; (B) laying first strip; (C) nailing method; (D) suggested method for setting nails.

when face nailed and set, shoe mould will cover nail

damage resulting from hammer setting finish floor nail set

damage resulting from hammer setting finish floor nail set of the panel. Nails should be at least 3/4 in. (19 mm long) for 1/4 in. (6 mm) panels and 7/8 in. (22 mm) long for 5/16 in. (7.9 mm) panels. Staples or screws may also be used. (See Table 38.)

Joints between panels and any defects in their surface should be filled with non-shrinking filler compound that will bond to the underlay. The filler should be sanded smooth after it has set.

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