Harcon Vapour Non Permeable Roofing Underlay Harcon NPU145
£ 24.33(Inc VAT £29.19)
Harcon Vapour Non Permeable Underlay 1000mm x 45m NPU145
Quantity Discount (inc vat)
1 - 9
£ 33.36
10 - 50
£ 29.19
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Harcon Vapour Non Permeable Underlay 1000mm x 45m


  • BBA certified for use on both warm and cold roof structures
  • Excellent nail and tear strength
  • Complies with BS5534:2003
  • Entirely watertight
Manufacturer: Harcon
Product Code: NPU145

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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.

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