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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.

Superior underlay where reduced foot noise and sound reduction in multi-story buildings are required
It is made of high-density polyolefin copolymer resin which effectively reduces the hollow feel when walking on floating floors
With the integrated moisture barrier there is no need for additional damp proof layers in most instances
• Super tough tear resistance to tools and boots
• Integrated peel and stick strip
• Will not hold water and will not mildew
• Super tough tear resistance to tools and boots
• Thickness supplied ISO 1923: 2 mm
• Field impact isolation class ISO 717/2: 64
Quiet-Step Combi-Lay has achieved rating of Ln,w + C1 = 44 dB and complies with BCA (Building Code of Australia) multistory requirements for acoustic performance.   The BCA states that multistorey noise should not exceed Ln,w+C1=62 dB
• Water vapour transmission rate ASTM E96: 1.7 g/m2, 24 hours 
• Water absorption 28 days JIS 6767: 0.03 mg/cm2
• Compression strength at 25% compression ISO 844: 70 kPa




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