What Side of a Lauan Underlayment Faces Up?

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Underlayment is hidden under flooring.
Underlayment is hidden under flooring. (Image: Parquet floor image by Einar Bog from Fotolia.com)

When laying new flooring down, such as hardwood, the surface that the final flooring is attached to is important for the integrity of the installation. Many types of these underlayments are available, including lauan, a form of plywood.

Identification

Underlayment is a layer of particleboard, hardboard or plywood attached to a subfloor or foundation to create a smooth surface on which to install the final flooring. Lauan underlayment is a popular type of plywood to support new flooring installations.

Installation

When installing lauan underlayment, make sure the smooth side is facing up and any nails or staples from installing the lauan are hammered down. This ensures an even surface for installation of the finished flooring.

Significance

The popular use of lauan as an underlayment is due to its availability in the market place, as well as its history as a reliable product. There are three grades of lauan. It is recommended to use the highest grade of lauan, designated BB, as underlayment.

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