How To Construct A Roof Valley

The three methods to shingle a roof valley.

How to construct a roof valley.

These valleys have large upstands each side of the upstand to direct water towards the gutter. This roof valley is a perfect example. To understand the concept and how all the pieces are laid out and cut i picture the roof two dimensionally in plan view. One of the details that varies between homes is the method of flashing the valley areas of the roof.

Where the pitches are not the same the batten spacing runs out of sync. Then i use a construction calculator to find the correct length of each rafter. The pitch of the old and new roofs were close but not the same so i would have to create open valleys instead. Next once you know the lengths of the rafters cut some wooden planks to size and make birdsmouth cuts in each one so.

To build a hip roof start by measuring the width and height of the building you re putting the roof on. 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. Part 3 of the four part guide to roof construction covers pitched roof detail. Often people use special valley tiles that are curved to make a seamless tile roof.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. Closed valleys or open valleys. However these can only be used where the pitch of the two roofs is the same. Part 1 a guide to roof construction covers an overview of flat and pitched roofs.

The first is the pitch of the roof. 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. The roof construction for mortarless valleys is similar to that for open grp valleys. 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. There are two common methods for completing the flashing of a valley in a shingle roof system. To get the most out of it is helpful to also read parts 1 and 2. Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance.