MonarTile Protect Roof Underlay

A cost-effective undertile lining, MonarTile Protect is ideal for small domestic new build and refurbishment projects in non-coastal areas. The lining is compatible with all commonly used roof coverings and is suitable for both open rafter roofs structures and sarked boarded roofs.

Offering significantly better water vapour resistance than traditional alternatives, MonarTile Protect also features a soft underside which prevents condensate run off. Impressively strong, the lining is tear and puncture resistant yet lightweight and flexible, making it easy to transport, handle and cut, thereby reducing installation times.

Features & Benefits

  • Strong with high levels of nail tear and puncture resistance.
  • Rot proof and long lasting.
  • Lightweight – easy to transport and handle rolls.
  • Flexible and easy to cut.
  • Quicker to install than traditional bituminous 1F underlays.
  • Easily chalk marked.

Product Availability

Product Code Description Roll Size Roll Weight
3004188 Monartile Underlay 15m x 1m 2.0kg
3006287 Monartile Underlay 45m x 1.5m 6.0kg


Product Data and Performance

Product Data
Surface finish: Matt Black
Material thickness: 0.45mm
Water vapour resistance: 190 MN/sg
Watertightness: Class W1
Tensile strength: MD: 150 N/50mm
CD:  135 N/50mm
Nail tear strength: MD – 140N
CD – 150N
UV resistance: 2 months

Wind Uplift Resistance

One of the functions of an roof tile underlay is to reduce the wind load, generated under wind gusts, that acts on the underside of the roof slates or tiles.
This issue is addressed in the BS5534 Code of Practice for Slating and Tiling. The selection of the correct underlay is dependent on the exposure of the roof to wind uplift, the type of roof construction specified and roof tile batten gauge. It may also be necessary to seal the lap of underlay.

Click here to check the suitability of this roofing underlay for your roofing project and to ascertain whether it complies with the wind uplift zonal performance requirements of BS5534.

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