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Underlay for Quick-step Laminate Flooring

Posted by Matthew Buckley, on Sat 16 Jul 2016 09:27am

I am about to lay a quickstep laminate floor, 8mm thick. The subfloor is quarry tiles on top of a suspended floor (floorboards as above a cellar room). Most would suggest screeding the floor but due to time constraints this won't be possible. There is a dip across the middle of the subfloor up to 10mm in places. I have been advised to use a 5mm fibreboard to get rid of as much of the dip as possible which i have purchased ready to use. I had also already purchased some 5mm underlay boards (very light polystyrene material) before i was advised to use the fibreboard. Is it worth putting these on top of the fibreboard to further level the floor? Or will they make it too springy? The previous laminate was on top of a very thin underlay, probably 2 or 3mm and there was only the odd place that had a slight dip/damage and the floor looked like it had been down for many years.

Simon Gee

Mon 18 Jul 2016 05:37pm

Hi if you have dips in areas causing a low , you need to self level them or use some kind of firm substance if you use underlay that thickness adds up to more than 6mm Max then you will cause bounce and put pressure on the board joints which could lead to them breaking . I hope this helps you Regards simon

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