How To Construct A Roof Valley

There are two common methods for completing the flashing of a valley in a shingle roof system.

How to construct a roof valley.

Part 3 of the four part guide to roof construction covers pitched roof detail. Next once you know the lengths of the rafters cut some wooden planks to size and make birdsmouth cuts in each one so. One of the details that varies between homes is the method of flashing the valley areas of the roof. The three methods to shingle a roof valley.

The first is the pitch of the roof. To understand the concept and how all the pieces are laid out and cut i picture the roof two dimensionally in plan view. However these can only be used where the pitch of the two roofs is the same. Where the pitches are not the same the batten spacing runs out of sync.

The pitch of the old and new roofs were close but not the same so i would have to create open valleys instead. 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. Then i use a construction calculator to find the correct length of each rafter.

These valleys have large upstands each side of the upstand to direct water towards the gutter. Part 1 a guide to roof construction covers an overview of flat and pitched roofs. To get started i need to know only two things. How to do a roof valley martin s roofing and guttering merton ltd for all your roofing needs.

This roof valley is a perfect example. Iko recommends that you install architectural shingles with the open valley method for the best roof performance. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Closed valleys or open valleys.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. To build a hip roof start by measuring the width and height of the building you re putting the roof on. To make the blind valleys we attached sleepers to the shed roof locating them by placing a 14 foot straightedge that is usually used for screeding concrete on top of the porch rafters to project the plane of the new porch roof over to the surface of the existing shed roof. Instead of having an open channel like traditional valleys mortarless valleys have a central upstand and the tiling is finished close to the upstand on each side.

Then enter those measurements into an online roofing calculator to determine how long each common rafter will need to be.