£74.99
In stock
Introducing HYPERFLEX POLY300 Torch-On Underlay, a premium professional roofing membrane developed by Felt Products for use within the HYPERFLEX built-up flat roofing system.
Manufactured using premium polyester reinforcement and SBS modified bitumen, HYPERFLEX POLY300 has been engineered to deliver the strength, flexibility and durability required from a high-quality professional torch-on roofing underlay.
With exceptional tear and puncture resistance, UV-stable construction and a substantial 44kg roll weight, POLY300 provides a tough and dependable waterproofing layer for demanding flat roofing applications.
Each roll measures 10m x 1m, providing approximately 10m² of nominal material before overlaps, and is supplied at 30 rolls per pallet for convenient trade and contractor purchasing.
When installed as part of the appropriate qualifying HYPERFLEX roofing system, the system can offer up to a 25-year guarantee when installed with HYPERFLEX 5.5kg and 3h roofing felt.
HYPERFLEX POLY300 has been developed by Felt Products to provide professional roofers with a premium alternative to standard roofing underlays.
The membrane combines two important technologies:
Together, these create a tough yet flexible roofing membrane capable of forming a dependable waterproof layer beneath compatible HYPERFLEX roofing membranes.
For customers and contractors searching for:
HYPERFLEX POLY300 provides a premium professional roofing solution.
HYPERFLEX has been developed to give professional roofing contractors a premium roofing system they can rely on.
POLY300 forms an important part of that system, providing a high-strength waterproofing underlayer beneath the final roofing membranes.
The focus of POLY300 is straightforward:
This makes HYPERFLEX POLY300 particularly suitable for contractors who want to move beyond standard glass fibre roofing underlays and specify a premium polyester membrane.
POLY300 is specifically designed as an underlay.
It is not intended to replace the final mineral cap sheet.
Instead, it forms a strong waterproofing layer within the complete HYPERFLEX roof build-up.
The underlay helps:
The two products perform different functions.
HYPERFLEX POLY300 Underlay
HYPERFLEX Mineral Cap Sheet
Together, they form part of a professional multi-layer waterproofing solution.
POLY300 has been designed specifically for use within the HYPERFLEX roofing system.
Using complementary HYPERFLEX products allows contractors to create a consistent system using products developed to work together.
Benefits include:
A major benefit of the HYPERFLEX range is the availability of an up to 25-year guarantee on qualifying installations.
This should be described as a system guarantee rather than an automatic guarantee on a single individual roll.
The strongest wording is:
Up to a 25-year guarantee when installed with HYPERFLEX 5.5kg and 3h roofing felt.
Each HYPERFLEX POLY300 roll measures:
10 metres long x 1 metre wide
giving approximately:
10m² of nominal roofing membrane before overlaps and detailing.
This generous roll format provides efficient coverage while remaining suitable for professional flat roofing installation.
Although each roll provides approximately 10m² of nominal material, actual finished coverage will be lower.
Additional membrane needs to be allowed for:
Roof quantities should therefore be calculated using the actual HYPERFLEX system overlap specification
Thank you for visiting and shopping at www.feltproducts.co.uk. Following are the terms and conditions that constitute our Shipping Policy.
We only deliver to mainland UK excluding the Scottish Isles. All other areas, please call for pricing.
All orders are processed within 2-3 business days. Orders are not shipped or delivered on weekends or public holidays.
If we are experiencing a high volume of orders, shipments may be delayed by a few days. Please allow additional days in transit for delivery. If there will be a significant delay in shipment of your order, we will contact you via email or telephone.
Shipping charges for your order will be calculated and displayed at checkout.
| Shipment method | Estimated delivery time | Shipment cost |
| Standard | 3-5 business days | As specified at checkout |
Delivery delays can occasionally occur.
You will receive a Shipment Confirmation email once your order has shipped containing your tracking number(s). The tracking number will be active within 24 hours.
Felt Products Northern Ltd is not responsible for any customs and taxes applied to your order. All fees imposed during or after shipping are the responsibility of the customer (tariffs, taxes, etc.).
Felt Products Northern Ltd is not liable for any products damaged or lost during shipping. If you received your order damaged, please contact the shipment carrier to file a claim.
Please save all packaging materials and damaged goods before filing a claim.
We currently do not ship outside the UK.
Our Return & Refund Policy provides detailed information about options and procedures for returning your order.
