UT Woven Undertile membrane

Eco Shield™ UT Woven Undertile membrane is a new woven polypropylene membrane that has been specifically formulated for use under roof tiles. It is 350 (micrometer) in thickness and made in rolls of 1,5 x 30 m. UT Woven is dimensionally stable, light in weight and weatherproof, handling and installation are easy, and will seal around nails.

It is used for the prevention of draughts and dust penetration into the roof spaces through tiles and prevents damage to ceilings, rotting of timbers and corrosion of plumbing. Dust can also penetrate between cornices and walls, initiating or aggravating allergies in susceptible people. The membrane is also designed to prevent moisture from warm, damp air reaching and condensing on the ceiling boards and other vulnerable points in the building fabric.

UT Woven also prevents strong wind from lifting and ripping off roof tiles. Most home loan institutions insist on the use of under-tile membrane where the roof pitch is less than 26 degrees or more than 45 degrees and in exposed coastal areas.

  Property Requirements
Eco Shield™ UT Woven® Undertile Membrane - SANS 952-2-1985 Type E Thickness, Um, min. 350
Mass per unit area, min, g/m2 100
Tensile properties
  1. Breaking strength, N/mm of width, min.
  2. Elongation at break, %, min

2.16 min
50
Puncture resistance, N/mm of thickness, min.
(Optional test, see 4.5.3)
29.0
 
Resistance to accelerated aging, % property retention, min
  1. Breaking strength
  2. Elongation at break

90
90
Resistance to accelerated weathering, % property retention, min
  1. Breaking strength
  2. Elongation at break

80
80
Water vapour transmission rate, g/m2.24 h, max 2.9
Installation Instructions
One layer of Eco Shield UT Woven weatherproof sheeting, installed over common rafters and under battens to receive tiles. Allow a minimum overlap of 100 mm.
Closed Soffit Detail
Boarding to be used at the open eaves to carry the Eco Shield UT Woven to the gutter. The boarding gives added security to the structure because it prevents wind-lift of the tiles from the underside of the open soffit.
Open Soffit Detail
Turn down the Eco Shield UT Woven over the fascia board at the eaves and seal into the gutter.
Benefits
  • The material equalises the pressure and complements the function of the roof tiles.
  • It is flexible and easily handled.
  • It is used for the prevention of draughts and dust penetration into the roof spaces through tiles, and prevents damage to ceilings, rotting of timbers and corrosion of plumbing.
  • The membrane is also designed to prevent moisture from warm damp air reaching and condensing on ceiling boards and other vulnerable points in the building fabric.
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UT Woven Undertile membrane
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UT Woven Undertile membrane