In this section, we'll look at the installation procedures that apply to hard underlays used over structural subfloors with plywood, particleboard, timber strip flooring and concrete surfaces.

The basic principles are more or less the same for all of the underlays covered in this unit, with some minor variations depending on the specific material you're using.

So the lessons in this section will deal with general principles, with some extra information on the differences between particular types of underlay where it is relevant.

Note that you must always follow the manufacturer's installation instructions for the specific underlay product you're installing.

If you're using a product for the first time, or installing it over a different type of subfloor than what you'd normally encounter, make sure you read the instructions carefully before you start.

We won't cover the specific requirements relating to 'wet area' installations, such as in bathrooms and laundries, because they only apply to fibre cement underlays - and there are other Australian Standards and building codes that come into play.

These issues are covered in other units in the Flooring Technology qualification.