Harcon Vapour Permeable Roofing Underlay Harcon VPU150M
£ 52.04(Inc VAT £62.45)
Harcon Vapour Permeable Underlay 120g 1500mm x 50m VPU150M
Quantity Discount (inc vat)
1 - 9
£ 71.37
10 - 50
£ 62.45
Order in the next Hours Mins and Seconds,
To get your watch delivered on Monday
Sorry this item is out of stock

Harcon Vapour Permeable Underlay 120g 1500mm x 50m

Harcon VPU has a 3 layer composite structure with the highly vapour permeable film bonded between two layers of nonwoven polypropylene.The top polypropylene layer provides high levels of water resistance while the bottom layer provides the strength for this flexible breather membrane which can be used in both unsupported and fully supported applications.

A vapour permeable membrane has 4 functions to perform.
1. Condensation Control
It allows warm moist air generated in the building to pass freely through it, helping to prevent condensation in the roof. As it is waterproof the water s created by the condensation which forms on the primary roof covering will simply roll down the Harcon VPU into the gutter.
2. Secondary Roof Covering
Stops any rain or snow which penetrates the roof tiles or slates getting into the building below.
3.Temporary waterproofing
During construction and if the primary roof covering is damaged Harcon VPU will protect the structure below.
Harcon VPU will prevent wind and any particles it may be carrying entering the roof void.
  • BBA certified for use on both warm and cold roof structures
  • Water Vapour Resistance 0.20 MNs/g
  • Highly vapour permeable
  • Excellent nail and tear strength
  • Complies with BS5534:2003
Manufacturer: Harcon
Product Code: VPU150M

►Return to product list

We offer a free standard delivery service on all orders over £500.00*. Orders under £500.00* will be charged £15.00* carriage.
Our standard delivery area covers mainland England, Scotland (Excluding Highlands) and Wales. For all other areas around the UK an additional delivery charge will need to be applied, we will advise you of this charge before your order is dispatched. For deliveries to these areas we are happy to provide a free quotation upon request.


We will always do our best to deliver stocked items ordered via our website within 3-5 working days. This applies to  goods ordered before 12.00pm and in stock.
Some of our products, because of their size (5m and over) and weight (over 80 kilos), have an estimated 3 to 5 working day lead time but we will endeavour to get them to you as soon as possible.
All the Roof Vent Products are made to order and have an estimated 7-10 working day lead time. This can be reduced for sites wishing to call off quantities that have been given to us in advance (call for further information). Please note: All Roof Vents are made to order and non returnable.
The Mardome Hi-Lights Range of Dome Rooflights have a 48 hour delivery schedule. Orders must be received by 1pm to qualify for the 48 hour (2 working days) delivery. Only available to mainland GB (excluding postcode areas begining KW, IV, AB, and PH)
CORRAPOL-BT Bitumen Roofing Sheets 1-2 working days.
We regret that timed deliveries cannot be given. Deliveries will be made between 8.00am and 5.30pm Monday to Friday.


All deliveries should be signed for and we would politely request that you sign and clearly print your name so that in the unlikely event that there are any discrepancies we will have a person to contact. If a signature cannot be obtained we will try to leave the goods in a safe location, but we cannot be held responsible for shortages or damages where goods have not been signed for.


Large or palletised goods will be delivered to a hard standing area only. The Customer shall be solely responsible for the unloading of the Goods and the Seller shall not be liable for any damage that occurs in the course of such unloading.
Any shortages must be reported within 48 hours.

If goods aren't sent by our own vehicles they are sent by reputable carriers such as Tufnell's, Fed-Ex  and Parcel Force. Heavier goods may be delivered by larger vehicles and will be off loaded as close as possible to the property whilst remaining on a hard standing surface.


Please do not arrange any labour until your materials are on site as we are unable to compensate you for your time in the event of a late delivery.
If you have ANY questions about our products, or want to give us some feedback about your shopping experience with us, please feel free to contact us on 03302 230 267 or email: customerservices
*excluding VAT

Harcon Vapour Roofing Underlay Installation Guide

Harcon VPU has been designed for simple installation with lap lines for the most common form of installation - partially supported on pitch roofs between 15º and 34º

Fully Supported System
Lay Harcon VPU over the support with the bright blue side uppermost and secure it to the support or rafters using counter battens a minimum of 12mm thick with corrosion resistant staples or clout nails.The tile battens are fixed to the counter battens leaving a ventilation gap between the Harcon VPU and the tiles.
Unsupported System
Lay Harcon VPU horizontally starting at the eaves as felt is traditionally layed.
In both supported and unsupported systems overlaps should be installed to shed water down the slope.

Related Products

harcon vapour permeable roofing underlay harcon vpu100dl
Harcon Vapour Permeable Underlay 120g 1000mm x 50m VPU100M
(Inc VAT £41.63)
harcon vapour non permeable roofing underlay harcon npu145
Harcon Vapour Non Permeable Underlay 1000mm x 45m NPU145
(Inc VAT £29.19)
Customer Reviews (0)