
The Story
Masons 150mm x 20mm 40 Below Flex is a self-adhesive flashing tape designed for sealing around windows, doors, and joinery openings to provide secondary water defence.
This product features an aggressively sticky surface that allows for easy application, making it suitable for various construction and repair tasks. The tape is designed to be nail and screw sealable with just one layer, ensuring a robust seal. Its white facer offers high water resistance and provides maximum UV protection for up to 270 days, making it ideal for outdoor use. Masons 150mm x 20mm 40 Below Flex is an essential tool for builders and DIY enthusiasts looking to enhance the waterproofing of their projects.
Features
- Aggressively sticky surface for reliable adhesion
- Nail and screw sealable with a single layer
- High water resistance for effective sealing
- Maximum UV protection for up to 270 days
- Designed for sealing around windows, doors, and joinery openings
Specifications
| Dimensions (W x H x D) | 150mm x 150mm x 150mm |
| Weight | 1.376kg |
| Material | Self-adhesive tape |
| Colour | White |
| Model Number | 150mm x 20m |
| Volume/Size | 20m |
Masons 150mm x 20mm 40 Below Flex is designed for effective sealing applications.

Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
Masons 150mm x 20mm 40 Below Flex is a self-adhesive flashing tape designed for sealing around windows, doors, and joinery openings to provide secondary water defence.
This product features an aggressively sticky surface that allows for easy application, making it suitable for various construction and repair tasks. The tape is designed to be nail and screw sealable with just one layer, ensuring a robust seal. Its white facer offers high water resistance and provides maximum UV protection for up to 270 days, making it ideal for outdoor use. Masons 150mm x 20mm 40 Below Flex is an essential tool for builders and DIY enthusiasts looking to enhance the waterproofing of their projects.
Features
- Aggressively sticky surface for reliable adhesion
- Nail and screw sealable with a single layer
- High water resistance for effective sealing
- Maximum UV protection for up to 270 days
- Designed for sealing around windows, doors, and joinery openings
Specifications
| Dimensions (W x H x D) | 150mm x 150mm x 150mm |
| Weight | 1.376kg |
| Material | Self-adhesive tape |
| Colour | White |
| Model Number | 150mm x 20m |
| Volume/Size | 20m |
Masons 150mm x 20mm 40 Below Flex is designed for effective sealing applications.










