Monartile Supa R Roofing Underlay

Monartile Supa R Roofing Underlay

MonarTile Supa-R is a high performance undertile lining ideal for small and large projects in weather exposed sites. MonarTile Supa-R has a weight of 150 g/m² and available in 1 x 50 m roll size.

MonarTile Supa-R is manufactured from a polypropylene (pp) hydrophilic spun bond with a strong reinforcing grid encapsulated with a polyethylene (PE) top coating layer. Designed for use over raftered and boarded roofs in exposed sites where greater mechanical performance is required due to wind uplift. The underside of the membrane will hold condensate and thereby prevent the “drip-effect” onto insulation material.

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
3007197 Monartile Supa R Roofing Underlay 50m x 1m 11.5kg


Product Data and Performance 

Product Data
Surface finish: Top side: Matt Grey
Underside: White
Material thickness: 0.79mm
Water vapour resistance: 250 MN/sg
Watertightness: Class W1
Tensile strength: MD: 500 N/50mm
CD: 400 N/50mm
Nail tear strength: MD – 410N
CD – 4000N
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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