IKO trade underlay medium sand surfaced 36Kg is used as an underlay as part of a multi-layer system or as a single layer for shed or hutch roofs. It is a cost effective roofing solution suitable for a wide range of projects, although it is not recommended for use on habitable buildings. This type of traditional roofing felt is composed of a fibre base, saturated and then coated with bitumen and surfaced with either sand or a slate finish. Used as a single, two-layer or three-layer application, these products are for use as temporary waterproofing or for use on sheds or garden buildings.


Key Features

• Traditional products
• Economy roofing materials
• Nail fixing, cold adhesive or pour and roll hot bitumen application

Application
These products are now used generally only for sheds, garden building etc. There are better performing products available that will give increased performance and life expectancy than traditional fibre based roofing membranes, and as previously indicated these products are not suitable for habitable buildings. Where applicable, Fibre Based Roofing membranes should be installed in accordance with the relevant sections of BS 8217: 2005, Code of practice for reinforced bitumen membranes for roofing' and to IKO's specifications. If applied by traditional pour and roll methods, hot bitumen is poured (or applied by a mop) in front of the roofing felt roll, which is then unrolled into the bitumen, spreading it to give a continuous coating for the full width. The membrane is applied with minimum 75 mm side and end laps. Built-up systems can equally be formed using IKOpro HP Cold Adhesive; however the general bonding principles still apply.Where using Fibre Based Roofing in a built-up system to a garage or outbuilding, it is typically installed in a two or three layer system. In a two-layer system both layers should be fully bonded, the underlay being bonded to a suitable substrate. In a three-layer system the cap sheet and intermediate layers should be fully bonded to a random nailed, or partially bonded, preparation layer depending on the substrate. Where used as a single layer on a shed roof, the minimum pitch of the roof should be 20 degrees.