Question 1

How long Does flashing tape last?

Accepted Answer

When installed and maintained correctly, high-quality flashing tape can provide effective waterproofing for 10 to 20 years. Its durability and lifespan, however, are influenced by various factors such as exposure to the elements, surface conditions, and application quality.

Environmental Factors: In exposed areas prone to heavy rain, wind, and UV rays, the lifespan of flashing tape may be at the lower end of the spectrum, around 10 years. Conversely, in sheltered locations with minimal weather exposure, the tape can last upwards of 20 years.
Surface Conditions: Proper surface preparation during installation ensures maximum adhesion and weather resistance. Surfaces that are clean, dry, and free from loose debris will help extend the life of the tape. Dirt, grease, or moisture beneath the tape can significantly reduce its longevity.
Quality of the Product: Premium brands and products with UV stabilisers, advanced adhesion technology, and high-grade materials tend to last longer and perform better over time.
Maintenance & Inspection: Regular inspection and re-sealing edges as needed can prolong the effective lifespan of flashing tape, ensuring it remains an effective barrier against water ingress.

Overall, when properly applied and maintained, flashing tape can effectively protect your property from water damage for a decade or more. Choosing quality products and ensuring correct installation are key to maximising its lifespan and safeguarding your building’s integrity for many years.

Question 2

What surfaces are suitable for flashing tape?

Accepted Answer

Flashing tape adheres effectively to a variety of sound surfaces, making it ideal for roofing and wall sealing. For best results, ensure surfaces are clean, stable, and free from dust, grease, or loose debris.

Suitable Surfaces Include:

Metal: Aluminium, steel, or lead, providing a smooth, durable base for reliable sealing around roof penetrations and gutter joints.
Brick and Masonry: Properly cleaned brickwork and mortar are excellent, especially for sealing chimneys and wall junctions.
Concrete: Smooth, dry concrete offers a strong surface for long-lasting waterproofing.
Plastic: PVC or uPVC surfaces work well, especially when clean and dry.
Timber: Dry, clean timber or wood is suitable for sealing gaps in fascias or cladding.

Tip: Proper surface preparation — cleaning and removing dust and grease, and sometimes roughening glossy surfaces — is essential for maximum adhesion and durability.

Question 3

Can I Use Flashing Tape in Wet Conditions?

Accepted Answer

Many high-quality self-adhesive flashing tapes are formulated to bond effectively even in damp conditions, making them versatile for various weather scenarios. However, for optimal adhesion and durability, it’s always best to apply the tape when the surface is thoroughly dry and free from dirt, grease, or loose debris. Moisture on the surface can hinder the adhesive’s ability to form a strong, lasting bond, potentially compromising the reliability of the waterproof seal over time.

Always check the product specifications before application to ensure the tape is rated for use in wet conditions. Some advanced waterproof tapes are designed specifically for high-humidity or rain-prone environments and can be applied even when surfaces are damp. Nevertheless, where possible, waiting for a dry, clear day or ensuring the surface is dry before installation will deliver the best long-term results, providing a secure, waterproof barrier that withstands UK weather.

While many modern flashing tapes are suitable for wet conditions, for maximum effectiveness and longevity, applying them on dry surfaces is strongly recommended. Always follow manufacturer guidelines and specifications for best results.

Flashing tape and Flashband

Bostik Flashband Flashing Tape 150mm x 10m

Bostik Flashband Flashing Tape 225mm x 10m

Bostik Flashband Flashing Tape 100mm x 10m

Evo-stik Flashband Grey 300mmx10m 220003

Everbuild Black Jack Flashing Tape 150mm

Everbuild Black Jack Flashing Tape 225mm

Everbuild Black Jack Flashing Tape 300mm

Everbuild Black Jack Flashing Tape 100mm

Flashing tape​ and Flashband