How To Build A Lead Roof Valley

Iko recommends that you install architectural shingles with the open valley method for the best roof performance.

How to build a lead roof valley.

This should be laid in two 1500mm lengths with a third length at the top. A roof valley is basically a gutter set between two meeting pitched roofs. 450mm wide code 4 lead should be used turned back at the edges. This recommendation includes iko s premium shingles.

The three methods to shingle a roof valley. When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. The roofing nails are fine so long as the lead of the roof valley is intact but once it starts to crack or fracture due to water pressure corrosion or other damage the nail provides a space for water to run into the home. To replace a 4metre long zinc or swept valley on a slated or tiled roof with a nice new lead one.

There are occasions when a roof valley is in good condition but the cement holding the tiles in place has washed out or crumbled. If you begin with accurate as built measurements and use a construction calculator to do the math you can cut all of the rafters for most roofs on the ground in just one shot. Installation procedures differ depending on the roof type and materials used. This roof valley is a perfect example.

It is therefore worth asking the valley manufacturer for guidance on this. In these circumstances it may be possible to just leave the existing valley base in place and replace only the cement. We will look here at the basic installation of an open lead lined roof valley. Check the entire roof valley carefully to locate the source of these problems.

The overlaps should be 150mm minimum and the only fixings should be a few copper nails under the overlaps. Roof valleys are a frequent source of leaks in older houses. Some grp valleys are sufficiently robust to enable them to be laid directly over the rafters rather than being supported on valley boards.