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Underlay is required any time you install an engineered timber floor or a laminate floor.  These floor types are installed using a 'floating' method as they are not actually attached to the sub-floor, instead the floor boards are attached together.  The underlay gets laid down over the sub-floor and the laminate or engineered floor is installed on top of the underlay.  The floor boards are attached together either by gluing the tongue and groove, or by locking the boards together, if it is a 'Uniclic' or 'LOC' up system which does not require a glue.
The function of the underlay is to absorb some of the minor imperfections in the sub-floor and to slightly soften the feel when you walk on the floor.  The underlay also helps to reduce reflected foot noise when walking on the floor since the flooring is not attached to the sub-floor. 
When choosing an underlay for your flooring project, you must use a product that is approved by the manufacturer of the particular flooring. Also it is important to check with Strata management, if you live in a unit or apartment, what type of acoustic underlay will be required.


Good quality medium-density polyolefin underlay which can be used for all floating floors
• Quick installation and cost effective
Easy to handle: 2 mm thick x 1 m wide
• Continuous clear damp proofing on one application
• 100 mm overlap and integrated peel and stick strip
• Compatible with standard trims
• Will not hold water and will not mildew
• Thickness supplied: 2 mm
• Rolls in 50m2 
• Flat polymers for easy installation
• Water vapour transmission rate (SD > 75m): SD = 86.7m
• Water absorption: 0.07 mg/cm2
• Compression strength at 25% compression: 30 kPa
• VOC Emission / ASTM D5116: 0.06mg/m2/hr





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