• Over 35 Years of Trading
  • £3m+ Stock Value
  • Best Price Promise
  • 9 Branches in London

Geotec Lead Underlay

In stock
SKU
437
View details
1 Excl. VAT £65.94 Excl. VAT

Est. delivery: 3-5 Working Days

View delivery options

Pickup location is selected at checkout
Product Features
  • Geotextiles weight: 220g/m2
  • Roll length: 25mtr
  • Roll Width: 1mtr
  • Coverage: 25m/2

Geotec lead underlay is an essential part of your roof structure. Needle punched and non-woven, geotextile polyester materials do not rot or cause adhesion.

First and foremost, its main use is to isolate the lead from the substrate layer, ensuring that the roof structure benefits from the best conditions, providing you with many years of problem-free service.

By creating a gap between the substrate layer and the lead, Geotec lead underlay ensures that there is an adequate amount of airflow between the roof elements. With the airflow ventilating the layers in the roof, any moisture that may have formed is dried effectively, preventing the detrimental effects of damp.

Underlay reduces the drag caused by thermal movement between the substrate layer and the lead sheet. It also allows the lead sheet to expand and contract as temperatures rise and fall, which means the roof structure can move freely without damaging.

Another benefit for lead underlay is it protects against the corrosiveness of the moisture that may leach from concrete/stone and some timbers. If this damages the lead, it may weaken the structure and compromise your roof.

Finally, the lead underlay protects against imperfections in the timber substrates, such as nail heads or knots, ensuring that the structural integrity of the roof and the lead is not compromised.

It also adds a further layer of protection against rain and other forms of precipitation. However, if the roof has been laid properly, it should not be required for this function.

With a roll width of 1 metre and roll length of 25 meters, you have all the information you require to work out how much material you will need for your roof. The constitution of the non-woven polyester felt underlay is 220g per metre squared, making it much lighter in weight than bitumen felts. Even though it is lighter in nature, it does not compromise on water resistance. 

FREE DELIVERY on Duratech Pitched Roof Windows and Accessories on orders over £50 (Exclusions apply)

All other Delivery Charges are based on weight and location, please add products to your basket to calculate shipping.

A small amount of product lines from particular manufacturers listed below will incur a supplier delivery surcharge.


Next Day Delivery available on orders of stocked items if placed before 2pm

Deliveries will be made between 8am and 6pm. Delivery times apply to weekdays only.


Delivery of Windows to England, Wales, and the majority of Scotland:

Delivery of Windows to the Channel Islands, Scottish Highlands, Northern Ireland, Isle of Man

(postcodes IV, HS, KA27-28, KW, PA20-49, PA60-78, PH17-26, PH30-44, PH49-50, ZE, AB)

Basket Value Price (£)
0-£249 £20
Over £250 £50

It is with regret that we cannot offer a service to these areas for orders over 126kg but please call us on and we will attempt to organise a delivery to your custom if required.


Supplier Delivery Charges

Please note the following supplier delivery surcharges:

Ariel Plastics = £25.00

Britmet Tileform= £35.00

Lead Products(orders under 250kg) = £50.00

Marley Eternit roof tiles (orders under a pallet) = £75.00

Marley Eternit sheeting (exclusions apply) = £50.00

Redland = £100.00

Palram = £25.00

Please phone us on if you are unsure.

What our customers say