VHP Value Roof Underlay

Top Performance, Self Supporting, Great Value

VHP Value is a high performance, self-supporting, highly breathable, tough, synthetic roof underlay. A huge upgrade from Bituminous Paper.

3 pliable layers: a very high vapour permeable water-resistant membrane and two tough layers of non-woven polyolefin fabric. These layers assist in the control of condensation and water vapour. VHP Value Roof Underlay is not fire retardant.

It has the following benefits:

  • Premium performance
  • Assists in moisture control - deflects water and air both during construction and as part of the finished roof
  • Affordable
  • Self-supporting
  • Highly breathable - transforms water vapour at higher rates than bitumen impregnated paper
  • Temporary weather protection - UV resistance for 21 days - although same-day coverage is strongly recommended
  • Codemark Certified


Intended Use

Masons Roof Underlays are for use as a self-supporting roofing underlay.

Building Code Provisions

  • B2 Durability: B2.3.1(a), B2.3.2
  • C3 Fire affecting areas beyond the fire source: C3.4(c)
  • E2 External moisture: E2.3.1 (contributes to), E2.3.2 (contributes to) ; E2.3.5 (ontributes to), (E2.3.6 (contributes to) E2.3.7
  • F2 Hazardous building materials: F2.3.1


Conditions and Limitations of Use

1. Masons Roof Underlays are certified for use as a roof underlay and air barrier:

a) on buildings situated in wind zones up to and including Extra High (as set out in NZS3604) with a minimum roof pitch of 3°,

b) under masonry or metal tile and profiled metal roof claddings,

c) in all locations including where it is exposed to view.

2. Masons Roof Underlay shall be:

a) installed in accordance with the manufacturer's installation manual, and

b) installed run vertically or horizontally with or without support for roof pitches greater than 10°, run horizontally with or without support or run vertically with support for roof pitches less than 10°, provided that support is provided where the span is greater than 1200mm, and

c) protected from direct sunlight within 21 days of installation.


Roll Size

VHP Value 125gsm Roofing Underlay

1.5m x 66.6m = 100m²

VHP Strong 140gsm Roofing Underlay

1.45m x 51.7m = 75m²

VHP Ultra 180gsm Roofing Underlay

1.45m x 34.48m = 50m²

VHP Maxi 220gsm Roofing Underlay

1.45m x 34.48m = 50m²

Available in-store at:

TRADIES: This product might not necessarily be a stocked item by your merchant however can be ordered in.

MERCHANTS: To enquire about this product or to place an order, please contact your local Mason’s rep >