Pitched Roof Valley Detail

Pitched roof detail part 3 july 11 2014 by jon davies 10 comments part 3 of the four part guide to roof construction covers pitched roof detail.

Pitched roof valley detail.

Essentially there are three main ways to shingle a roof valley. We know that the roofs are generally provided at top to cover and protect the structure from different weather conditions. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Pitched roofs are generally used where rainfall is heavy.

Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. Water collects in a valley to flow off the roof. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Ensure that underlay is not laid under metal.

Ensure that valley boards plywood sheathing and tilting fillets provide full support for metal valley. Maximum catchment areas for valley gutters are given in table 8 of e2 as1 for minimum roof pitch and gutter widths. Pitched roof is a type of roof which is provided with some slope as structure covering. Valley with metal lining.

Catchment area must be no more than 25 m gutter must be at least 250 mm wide. Woven closed cut and open. Cut underlay to rake and dress over tilting fillets to lap onto metal valley. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.

Cut tile and a half tiles neatly and fix to form a gap minimum 125mm wide centred on valley. Purpose made valley trough tiles should be supported by gutter boards where the roof uses single lap interlocking tiles they should be mechanically cut to the correct rake adjacent coverings should be neatly cut to form a smooth junction and preferably be cut from tile and a half tiles. A common misconception is that the mortar bedding is there to prevent water access. A roof valley is formed where two roof slopes meet.

Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings. To get the most out of it is helpful to also read parts 1 and 2. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash roof edges before shingling.