It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential.

Tile roof valley detail. However a valley gutter with a minimum clearance of 100 mm allows the gutter to be accessed more easily for cleaning see figure 3. While it is not possible to list and detail every condition that may be encountered boral roofing will assist and advise on any special situations that may occur. Roof valleys are the v shaped metal channels that sit between the folds of the roof where two sloped sections meet. Experienced installers may make a cut dog ear to the point of the tile that is overlapped by the succeeding row.

This manual has been prepared to assist the builder architect and installer to specify detail prepare and install boral roof tiles. Valley seals are also placed under the tiles in the valleys to prevent flooding. Putting on the tiles tiles are then laid out across the roof and clipped on. C fixings for roof battens and batten sizes must comply with open link in same page part 3 4 3.

One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley. Roof valleys are the vee shaped metal channels that run up and down the folds of a roof. Note that it is not necessary to mechanically fix the valley tiles. B roof tiles on roofs with a pitch of not less than 15 degrees and not more than 35 degrees must be fixed in accordance with open link in same page figure 3 5 1 1.

These pictures show where roof valleys are located on a roof. Valleys channel water away and prevent backwashing. Where the different sides of the roof meet. Cut adjacent tiles and tile and a half tiles so that valley tiles course in and fit neatly.

They also tend to collect leaves tree branches twigs and bird droppings which means they are vulnerable to corrosion and even a small hole can lead to significant leakage. Tile installers are craftsmen and each develops his or her own approach to valley details. A rusty valley on a tile roof which needs to be replaced typically where a valley is located on a roof. A common misconception is that the mortar bedding is there to prevent water access.

Depending on the length of the valley and the tributary area installers may flare or gradually open the width of the valley tile cut. Where a valley gutter is less than 250 mm wide for profiled metal and masonry tile roofing e2 as1 allows the roof overhangs to be reduced to 60 mm to give a 40 mm clearance between overhangs. Tiles at the edges are cut to make even lines along the hips and valleys of the roof i e.

• Tile Refinishing Kit