Pitched Roof Valley

Water collects in a valley to flow off the roof.

Pitched roof valley.

Made from glass reinforced plastic they are a strong long lasting and lightweight alternative to traditional lead and zinc valleys. In a hip roof with equal pitches the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof. A common misconception is that the mortar bedding is there to prevent water access. Ridge verge valleys.

Shop from our range of grp valley troughs. In his latest consultant case study pitched roofing consultant john mercer focuses on tiled valleys and dispels some myths around mortar and offers some key guidance on an area that in his experience presents some of the most common causes of roof leakage in this next case study i turn my attention to tiled valleys. Essentially there are three main ways to shingle a roof valley. For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17.

They can only be used when the pitches of the two roofs are identical. It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. An open valley often 100mm or 150mm wide with a metal normally lead or sometimes a grp lining.

One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley. A roof valley is formed where two roof slopes meet. Woven closed cut and open.