A non-breather underlay consisting of a double layer polyethylene sheet with a 12x12 mm multifilament polypropylene reinforcing grid built in, a combination giving great tensile strength and tear resistance.


All roof underlays should be installed to comply with BS 5250, BS 5534 and BS 8000: Part 6. MonarTile Supa-R is laid horizontally across the rafters, white surface down, starting at the eaves, it should be draped to allow for small temperature movements and to ensure a gap between the tile battens and underlay, for drainage purposes.

General information

Uniclass 2015

Pr_25_57_65_60 Plastics sheetsPrimary


H60/10 Vertical tiling

H60/105 Clay roof tiling

H60/110 Clay roof tiling with counterbattens

H60/120 Concrete roof tiling

H60/125 Concrete roof tiling with counterbattens

H60/145 Clay vertical tiling

H60/155 Concrete vertical tiling

H60/3 Roof tiling

H61/10 Vertical slating

H61/105 Roof slating

H61/110 Roof slating with counterbattens

H61/120 Vertical slating

H61/5 Roof slating

H62/10 Vertical slating

H62/105 Roof slating

H62/110 Roof slating with counterbattens

H62/120 Vertical slating

H62/125 Roof slating

H62/130 Roof slating with counterbattens

H62/140 Vertical slating

H62/145 Roof slating

H62/150 Roof slating with counterbattens

H62/3 Roof slating

H62/365 eaves

H62/47 Eaves

H64/10 Wood shingle/ shake roofing

H64/110 Wood shingle/ shake roofing

H64/120 Wood shingle/ shake roofing with counterbattens

H64/130 Vertical wood shingle/ shakes

H64/15 Vertical wood shingle/ shakes

H65/10 Reconstituted slate roof tiling

H65/105 Clay roof tiling

H65/110 Clay roof tiling with counterbattens

H65/115 Concrete roof tiling

H65/120 Concrete roof tiling with counterbattens

H65/125 Reconstituted slate roof tiling

H65/130 Reconstituted slate roof tiling with counterbattens

H65/140 Ceramic slate roof tiling with counterbattens

H65/5 Roof tiling

H67/110 Metal roof tiling

H67/120 Metal roof tiling with counterbattens

H67/130 Metal vertical tiling

H67/5 Metal roof tiling

H67/8 Metal vertical tiling

Specification data - Plastics sheets

Product Reference

MonarTile Supa-R

Accessories: IcoVent Roof ventilators

Not required

Required as drawing ___

Required at ___

Standard product features


Matt Grey surface/ White underside.


0.24 mm.


1 m.

Tensile Strength:

(N per 50 mm): 500(MD), 400(TD).

Product Options


IcoVent Roof Ventilators – Designed to be inserted in the underlay to ventilate the roof space through to the tile/ slate area. Does not penetrate the tiles/ slates so not visible on the roof surface. Can be used in most areas of the roof, particularly where normal ventilation is interrupted, e.g. at hips, roof windows or fire stop walls.

Thermoplastic rubber vent of 100 mm diameter and 5000 mm² ventilation area.

Similar products from BMI Group UK Ltd

Monarflex Monofilament 250

Monarflex Netofol

Monarflex Protect 1F

Monarflex RAC

Monarflex RAC

Monarflex Reflex Super

Monarflex RMB 400

Monarflex Ultra 250

Monarflex Ultra 300