Some grp valleys are sufficiently robust to enable them to be laid directly over the rafters rather than being supported on valley boards.
Roof dry valley construction.
In many ways the roof construction for a pre formed grp valley is the same as that for a lead lined valley.
Roofing shingles are installed then cut and sealed where they overlap the metal channel.
For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.
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.
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.
Many of these warm constructions include a requirement for counterbattens below the slating or tiling battens.
Redland dry valleys are suitable for both traditional cold roof and warm roof construction.
Woven closed cut and open.
Installing a close cut grp valley with redland 49 tiles.
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.
Dry fix valley troughs are mortar free providing hidden water gulleys at the roof valleys.
Also keep in mind that at times open valleys are prone to storing water and thus causing roof leakages.
Essentially there are three main ways to shingle a roof valley.
Open valley troughs have been designed as an alternative to traditional lead troughs a safe and efficient way to collect rainwater run off.
Water collects in a valley to flow off the roof.
Either lay tiles dry or bed on mortar onto fibre cement undercloaks laid loose on each side of valley ensuring a minimum 25mm gap between mortar and the tilt fillet.
No one but you can decide which kind of valley you want for your roof.
While making a decision about that do consider factors like cost then entire look and of course the functionality.
In this situation the bridge piece is placed in position to support the smaller cut tile section.
It is therefore worth asking the valley manufacturer for guidance on this.
In the latter case where the insulation follows the rafter line there are many different ways of constructing the roof.
Alternatively a tile and a half may be used to avoid small cuts of tile.
The pitch of the roof here is 35 degrees the untiled main slope of the roof is 45 degrees.
Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.
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.
