Valley watertighness

An area at risk

Valleys, on roof, are critical areas. Being located at the junction of two roofs, it is vulnerable to the water flows of two different roofs. An insurance company survey about roof leakages revealed that 30% of roof leakages originated from the valley areas. Hence, it is very important to treat this area carefully with the right products and methods.

MONIER has developed an aluminium-based metal valley sheet  that, not only, protects your roof from leakages but also improves significantly the aesthetic of your roof. Traditional treatments,with layers of mortar, are often not aesthticlly pleasing, and are underperforming. (see picture)

Technical information

Laying starts from the bottom of the valley towards the top of the valley. Adjusting the length of the valley sheets to the actual length of the valley is made by cutting the top valley sheet (never the bottom one)  or by increasing the overlapping between sheets. The minimum overlapping must be 15cm.
Fixing valley sheets must be done by screwing them under the overlapping area.

Dimension of sheets : 1.2m X 0.4m
Colors : available in orange and black to match roof colors
Material : high quality aluminium with stove enameling
Three pre-bending lines for easier laying on roofs 

Dry closed-valley on a roof, with perfect aesthetics
Traditional valley treatment with mortar, unaesthetic result and poor performance
Opened valley with color matching valley sheet