Ondutile is a unique roof underlay system utilising Onduline PP corrugated roof sheets below tile, slate or shingle roof coverings to create an independent secondary weatherproof roof.

This enables the primary tiled roof to be used safely below the manufacturers minimum recommended roof pitch.

Ondutile minimum recommended roof pitches:

  • Interlocking concrete tiles: 12.5°
  • Clay pantiles, natural and fibre cement slates: 17.5°
  • Plain double lap tiles: 22.5°

The Ondutile low line sheet has been developed with a corrugation height of only 24mm. Providing the same durable weathering performance whilst reducing the roof section making it ideal for projects where height restriction or the aesthetic appearance of the roof line is of paramount importance.

Ondutile System


  • Immediate weather protection
  • Moisture control
  • Reduced roof pitch
  • Thermal and sound Insulation
  • Ventilation
  • BBA Certification (Ondutile only)


Ondutile (Onduline sheet)

Lenght 2,000mm
Width 950mm
Thickness 3mm
Corrugation Height 38mm
Corrugation width 95mm
Number of corrugations 10
Coverage per sheet 1.9smq
Weight per sheet 6.4kg


Onduline lowline (Mini Profile)

Lenght 2,000mm
Width 866mm
Thickness 2.6mm
Corrugation height 24mm
Corrugation width 48mm
Number of corrugations 18
Coverage per sheet 1.38msq
Weight per sheet 5.83kg