Ripped up the old laminate to replace with a wood fibre underlay from b&q and new laminate on top. This is underneath, to which I'm assuming is bitumen? Does it need a
5mm Fibreboard Underlay 6.99m2 | Homebase
Green Floor Fibreboard Underlay - Natural Wood Fibre Insulating Panels
Wood Fiber Flooring Underlayment – 6MM | 1/4 Inch | 180 Sq. Ft – for Laminate, Vinyl, LVT, LVP Hardwood Floor | Natural Sound Insulation Barrier… - Amazon.com