The Danelaw® pitched roofing underlay product range includes a selection of low resistance tile and slate roofing underlays; available in 4 weights, 120gsm, 135gsm, 150gsm and 180gsm. The 120 and 150 are also available with integral tape suitable for all wind zones.

Danelaw® low resistance underlays are fabrics manufactured in three layers:

• Top layer is UV stabilised polypropylene to protect against the sun during installation and is usually the strongest of the layers.
• The middle layer is a microporous film which is water resistant and vapour permeable.
• The bottom layer is also made from polypropylene but is thinner than the top layer due to not needing the UV protection.

The pitched roofing underlays provide an effective solution to protect the building and its occupants from harmful effects of interstitial condensation and external climatic conditions including wind, snow and wind driven rain.

Typically the stronger the weight of the pitched roof underlay, the stronger it is, but this also depends on the product’s composition.

The products have been developed for use in cold and warm pitched roof applications, and are suitable for use draped and unsupported, or fully supported on sarking or insulation boards.

Wind Zones

When selecting an underlay for use on a pitched roof, it is important to take the Wind Zone of the area into account.  Wind zone information will always be displayed on the product label and datasheet.

You can also use our interactive wind zone map to help you decide which underlay you need

See below for our range of roofing underlays.