Table 11 gives the minimum recommended valley widths for different roof pitches and plan areas.
Roof valley gutter construction details.
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Design right by alide elkink freelance technical writer wellington cross sectional details for valley gutters are given in both acceptable solution e2 as1 and the nz metal roof and wall cladding code of practice.
Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings.
Part 1 a guide to roof construction covers an overview of flat and pitched roofs.
Here are a few pointers.
Soakers and step flashings step and cover flashings and secret gutters 30 cover flashings 31 apron flashings 32 chimney flashings 33 pitched valleys 34 ridges and hips 35 mitred hip and valley soakers 36 parapet and tapered gutters 36 drips and rolls for gutters 37 chute outlets for gutters 37 pipe outlets for gutters 38 roll and drip joints 39.
Cover valley with a strip of underlay not less than 600mm wide underlapping general underlay.
In a previous video we covered how to flash roof edges before shingling.
There are two common methods for completing the flashing of a valley in a shingle roof system.
Flashing a humpy old roof valley requires a little give and take and a backup plan.
Proprietary gutter or valley systems.
Cut adjacent tiles and tile and a half tiles so that valley tiles course in and fit neatly.
Valley gutters detailing around the intersection of a valley gutter and a fascia board can be a little tricky.
Valley with valley tiles ensure that continuous support is provided for ends of tiling battens on each side of valley.
The width of the open valley is dependent upon the roof pitch and the volume of water expected to drain into the gutter.
In this video we ll flash the valley.
First clean the debris out of the valley including sawdust nails and whatever else is in there.
We use lots of sketches and photos in our building surveys.
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.
To understand what makes a valley either closed or open it is important to understand how a valley is constructed.
One of the details that varies between homes is the method of flashing the valley areas of the roof.
Part 3 of the four part guide to roof construction covers pitched roof detail.
To get the most out of it is helpful to also read parts 1 and 2.
Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters.
Purpose made valley trough tiles should be supported by gutter boards where the roof uses single lap interlocking tiles.
Roof problems valley gutters.
Valleys shall have suitable weathering details including flashings to resist the passage of moisture to the inside of the building.
