Should Roof Valleys Be Pointed

This video shows how to repoint a lead roof valley.

Should roof valleys be pointed.

Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. After about a year the pointing from one of the valleys fell out. A scaffold tower has been used for access in this video. Then it has to be reinstated after the valley change.

To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them together. But if the shingles are not laid in the valley properly a woven valley may not lay flat creating bumps and detracting from the overall look of the roof. The upstands or tilting fillets at each side of the valley are an important feature of good valley construction as they keep the water within the centre area of the valley. Nevertheless they are often omitted from lead valleys.

I had it repointed again in october 2014 and it has fallen out again from under the roof tiles. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. A house with an l shaped or t shaped footprint for example always will have roof valleys where the two sections of the house meet. Some homeowners prefer the consistent look that a woven valley provides.

The valleys on many older houses comprise layers of roofing paper which can deteriorate over time. To shingle out of the valley with laminated shingles lay a shingle down as a gauge and mark the corner at the bottom left and top right of the roof. I had my roof retiled about 6 years ago. The upstands will prevent water ingress even if the mortar is missing or damaged.

To change a valley on a tiled roof the ridge capping at the top of the valley has to be removed. I suspect it has never been done properly each of the 3 times it has been pointed. So when it is time to have your ridge capping repointed on your tiled roof take a good look at the valleys. Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.

Nrca lile points out that woven roof valleys are limited to cutout style 3 tab asphalt roof shingles as there are no openings to weave solid or architectural or dimensional or laminate style asphalt shingles together and he adds that the valley s slope should be at least 4 in 12 or steeper installed typically over a layer of mineral granule faced roll roofing.