Calculate the exact quantity of Technonicol Alpha ANDEREP polymer underlayment required for your space. We include a recommended wastage buffer for a seamless fit.
TECHNONICOL Alpha ANDEREP is a four-layer polymer roofing underlayment designed to act as a secondary waterproofing layer beneath bitumen or asphalt shingles on pitched roofs.
It is used under asphalt/bitumen shingles on pitched roofs, including residential houses, villas, bungalows, and sloped roofing systems.
Alpha ANDEREP is suitable for roof slopes from 12° to 90°, making it ideal for most pitched roofing designs.
The anti-slip top surface improves installer safety, especially on steep roofs, and allows secure walking during installation.
Yes. Alpha ANDEREP features an integrated adhesive strip, which helps ensure tight overlaps, faster installation, and improved wind resistance.
Yes. It meets Water Tightness Class W1, meaning it provides high waterproof protection as a secondary barrier beneath shingles.
No. Alpha ANDEREP is not a standalone roofing material. It must always be covered with asphalt or bitumen shingles.
It is designed to perform in a wide temperature range from –35°C to +80°C, making it suitable for both cold and hot climates.
Yes. The reinforced polymer structure offers excellent nail tear resistance, ensuring secure fastening during shingle installation.
It is installed using the mechanical nailing method as per TECHNONICOL roofing guidelines, with the membrane laid logos facing upward.
Yes. Alpha ANDEREP provides added protection against wind-driven rain and moisture ingress, especially in harsh weather conditions.
Alpha ANDEREP is supplied in rolls of 50 m length and 1.5 m width, allowing fast coverage of large roof areas.
Yes. It is widely used in residential roofing projects, including villas, independent houses, and sloped roof homes.
It protects the roof deck, improves overall roof durability, and acts as a backup waterproofing layer if shingles are damaged.
Compared to basic underlays, Alpha ANDEREP offers: 1. Higher strength 2. Anti-slip safety 3. Adhesive overlap strip 4. Better waterproofing reliability 5. Longer service life
