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The GDRR Dry Fix Roll-Out Ridge is a mechanically fitted system that securely fixes the ridge tiles onto a roof, protecting them from wind uplift and rain penetration without the need for mortar and pointing. The system provides 5000 mm²/m ventilation to the roof void through the vent roll, the equivalent of a continuous 5 mm gap.

Features and benefits:

  • Compatible with most makes of concrete half-round and angled ridge tiles.
  • Can be used on roofs with a pitch of between 15–45°.
  • The system is compatible with most slate, concrete flat and profiled tiles.
  • No need for mortar, the system can be installed in all weathers.
  • Ridge ends can be finished off with Manthorpe’s Ridge End Caps, available from the SmartVerge range.

General information



Dark Brown




Guidance for specification option:

GDRR-BS Batten Support Bracket.


Guidance for specification option:

GDRR-RR Vent Roll.


Guidance for specification option:

GDRR-RU Ridge Union.


Pr_35_90_93_29 Dry fixing ridgesPrimary


H60/700 Dry ventilated ridges

H60/75 Dry ventilated ridges

H62/700 Dry ventilated tile ridges

H62/75 Dry ventilated tile ridges

H65/505 Dry hips

H65/55 Dry hips

H65/700 Dry ventilated ridges

H65/75 Dry ventilated ridges

Specification data - Dry fixing ridges



GDRR-BS Batten Support Bracket.

Guidance for specification option:

  • Material: Galvanized steel.
  • The Manthorpe Batten Support Bracket provides a steady, secure platform for the horizontal ridge batten at the apex of the rafters, when fitting the Manthorpe Dry Ridge system.
  • The brackets have four different bend points to accommodate a range of roof pitches and tile heights and are designed to hold a single length of 25 x 38 mm batten.

GDRR-RR Vent Roll.

Guidance for specification option:

  • Supplied in lengths of 6 m, the Ridge Roll is placed along the length of the ridge prior to the ridge tiles being installed.
  • The roll is made up of a vapour permeable membrane down the centre, with a corrugated acrylic coated aluminium strip down each edge.
  • The malleability of the aluminium allows the roll to be shaped to the profile of the roof tiles and is secured in place with a butyl strip already attached to the underside.
  • The punched vapour permeable membrane will provide ventilation to the roof void of 5000 mm²/m whilst avoiding the ingress of wind driven rain and the entry of large insects.

GDRR-RU Ridge Union.

Guidance for specification option:

  • Material: Polypropylene.
  • The Ridge Union sits in the gaps between each of the ridge tiles, holding them in place.
  • The ridge union body slides onto the end of the ridge tile and is flexible so that it bends to the shape of the tile.

Contractor's choice.

Roll colour


Dark Brown.


Free airflow

5000 mm²/m.