Underlays Datasheet

There are two categories of Premium Underlay: Building Papers conform to BS EN 1521/ AIF Are suitable for smooth plywood decking (underside of decking must be ventilated). Can prevent chemical attack from smooth concrete, stone or oak surfaces. Must be fitted over whole substrate area. Geotextiles Are needle punched, non-woven geotextile polyestermaterials in two unit weights - 200 and 220 g.m-2. Are suitable for more uneven surfaces, e.g. traditional timber boards. Do not rot or cause adhesion. Allow space for airflow between lead sheet and substrate. Includes further details on the product, advice on use, lot sizes, health and saftey advice and product description and properties.