Roof Dry Valley Construction

Roofing shingles are installed then cut and sealed where they overlap the metal channel.

Roof dry valley construction.

A roof valley is formed where two roof slopes meet. Cut tile and a half tiles neatly and fix to form a gap minimum 125mm wide centred on valley. In many ways the roof construction for a pre formed grp valley is the same as that for a lead lined valley. Also keep in mind that at times open valleys are prone to storing water and thus causing roof leakages.

The pitch of the roof here is 35 degrees the untiled main slope of the roof is 45 degrees. Open valley troughs have been designed as an alternative to traditional lead troughs a safe and efficient way to collect rainwater run off. If your roofing contractor can he will get rid of the metal which means you don t have to pay for it while installing a roof valley. In the latter case where the insulation follows the rafter line there are many different ways of constructing the roof.

Some grp valleys are sufficiently robust to enable them to be laid directly over the rafters rather than being supported on valley boards. Installing a close cut grp valley with redland 49 tiles. The metal is usually pre painted to best complement the shingles color blend. Woven closed cut and open.

No one but you can decide which kind of valley you want for your roof. The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off. Dry fix valley troughs are mortar free providing hidden water gulleys at the roof valleys. Essentially there are three main ways to shingle a roof valley.

Alternatively a tile and a half may be used to avoid small cuts of tile. In this situation the bridge piece is placed in position to support the smaller cut tile section. Additional eaves closure pieces and counter battens are not required and they create a close cut appearance. Water collects in a valley to flow off the roof.

Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. While making a decision about that do consider factors like cost then entire look and of course the functionality. Many of these warm constructions include a requirement for counterbattens below the slating or tiling battens. It is therefore worth asking the valley manufacturer for guidance on this.

For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. The dry valley mitred at the ridge and awaiting the final tile course.