This traditional dry-fix valley trough is suitable for use in slate and tile-pitched roofs. Made from GRP (Glass Reinforced Plastic), it is an ideal lead replacement as it is less prone to vandalism or theft, more resistant to accidental damage and is cheaper and tougher. The t... Read More
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This traditional dry-fix valley trough is suitable for use in slate and tile-pitched roofs. Made from GRP (Glass Reinforced Plastic), it is an ideal lead replacement as it is less prone to vandalism or theft, more resistant to accidental damage and is cheaper and tougher.
The traditional dry fix valley has options to suit slate, plain, low profile or high profile tiles. Using this GRP valley trough saves you a significant amount of time during installation, eliminating any issues compared to traditional methods.
At a roof pitch from 17.5° to 22°, there should be a 350mm lap, from 22.5° to 29° a 300mm lap, from 30° to 39° a 200mm lap and from 40° to 49° a 150mm lap.
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Question:
Recommended installation of these valleys
Answer:
Install the valley on boards wide enough to support the roofing battens: use either minimum 12mm plywood boards fitted between the rafters, or 6mm continuous plywood boards over the rafters. Lay a single strip of roofing underlay up the centre of the valley, then fit counter battens the same depth as the roofing battens. Lay the main roofing underlay over the counter battens and position the roofing battens close to them, with their ends firmly supported on the valley boards. Cut the fascia so the valley trough can discharge into the gutter without being flattened. Trim the trough to the gutter’s centre line, usually with a V-shaped cut. Fit it centrally between the valley boards and nail its sides to the counter battens at maximum 500mm centres. The recommended lap depends on roof pitch: 350mm at 17.5°–22°, 300mm at 22.5°–29°, 200mm at 30°–39°, and 150mm at 40°–49°.
Question:
Does this valley work for plain tiles & does go over or under battens
Answer:
Yes for Plain tiles and slate - It goes over the battens look at this https://www.roofingsuperstore.co.uk/user-guides-brochures/corodrain-grp-valley-bba-certificate.html (page 3)
Question:
is 80mm height suitable for slate roof?
Answer:
Yes this will be suitable for use on a Slate Roof.
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