The 3m Dryfix 400mm Valley Slate 55mm Upstand (GDFVTUB55) is a high-performance Glass Reinforced Polyester (GRP) dry-fix valley trough specifically designed for slate roof applications. Engineered as a lightweight, mortar-free alternative to traditional lead valleys, it forms a reliable, weather-tight drainage channel where two roof slopes intersect.
 
Featuring a 55mm central upstand profile, this unit is optimized for flat slates, ensuring a low-profile finish that prevents water cross-wash while maintaining a sleek, unobtrusive appearance along the valley line. Measuring 3 meters in length by 400mm in width, its robust under-batten fix design enables fast, efficient installation directly onto roof valley boards, reducing labor time and site costs.
 
Manufactured to withstand severe thermal expansion, UV radiation, and harsh weathering, the GDFVTUB55 valley trough will not warp, rust, or stain surrounding slates. Its durable composite material provides a long-lasting, maintenance-free water management solution that eliminates the theft risks associated with traditional lead flashings.
 
Life expectancy of over 30 years
Convincing simulation of traditional lead
Light and easy to transport, handle and install
Virtually maintenance-free
Manufacture assured to BS EN ISO 9001
BBA Certification (No. 07/4492)
The cost-effective alternative to lead gutters