iTP Powerlon UltraPerm


High performance roof & building breather membrane

Breathable underlays for all pitched roof and timber frame wall applications.

Powerlon UltraPerm is a range of high performance breathable underlays for all pitched roof designs and timber frame wall applications.

High water vapour permeability and exceptional water resistance.

The BBA certified, Powerlon UltraPerm range is fully tested to the latest BS 5534:2014 + A1:2015 zones 1-5.

Non-woven composite membrane with pre-printed marking lines for easy installation.


Available for delivery direct from the manufacturer with an approx. lead time of 2-3 days.


Product options


Availability Indicators

iTP Powerlon Ultraperm is sent direct to site from the manufacturer and is subject to the iTP Membranes shipping charge.

Reasonable stock levels are held with delivery lead times being around 2-3 working days.

iTP reserves the right to change stocked products - while we will do all we can to keep on top of changes, availability and lead times my vary.

  • Generally 1 to 3 working days for delivery
  • Generally 1 to 5 working days for delivery
  • Generally 5 to 10 working days for delivery
  • Special request or made to order item, allow extended lead times. Minimum order levels may apply.
  • Please call to check availability and approximate lead times

Delivery charges will be calculated at check-out. Please visit our Ordering From Us page for further details on minimum order levels and delivery charges. If you have any queries, please do not hesitate to contact me via our Contact Form or on 01903 899 898.

Product Application

Breather membrane for roofs and walls

iTPs high performance breather membrane, Powerlon UltraPerm, is suitable for use in ventilated and unventilated, supported or unsupported, cold and warm pitched roofs as well as timber frame walls.

Product Make-up

Core: Powerlon UltraPerm is a thermally bonded composite membrane, made up of two layers of non-woven polypropylene with a microporous film between them, creating a breathable waterproof membrane with exceptional water vapour resistance and water repellant characteristics.

Product Properties

Weight115 g/m²135 g/m²155 g/m²
Roll Length25m and 50m50m50m
Roll Width1m and 1.5m1m and 1.5m1m and 1.5m

Product Performance

Tensile StrengthMD 300 / XD 200MD 330 / XD 230MD 320 / XD 200
Nail Tear ResistanceMD 120 / XD 160MD 130 / XD 200MD 140 / XD 230
Temperature Range-40 to +70 °C-40 to +70 °C-40 to +70 °C
Water Vapour Transmission0.02 Sd0.02 Sd0.02 Sd
Water TightnessW1W1W1
UV Resistance3 months3 months3 months