How To Construct A Roof Valley

The three methods to shingle a roof valley.

How to construct a roof valley.

To build a hip roof start by measuring the width and height of the building you re putting the roof on. Closed valleys or open valleys. Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings. This roof valley is a perfect example.

There are two common methods for completing the flashing of a valley in a shingle roof system. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. To get started i need to know only two things. Iko recommends that you install architectural shingles with the open valley method for the best roof performance.

Part 3 of the four part guide to roof construction covers pitched roof detail. The first is the pitch of the roof. The pitch of the old and new roofs were close but not the same so i would have to create open valleys instead. 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 understand the concept and how all the pieces are laid out and cut i picture the roof two dimensionally in plan view. Then i use a construction calculator to find the correct length of each rafter. Where the pitches are not the same the batten spacing runs out of sync. Next once you know the lengths of the rafters cut some wooden planks to size and make birdsmouth cuts in each one so.

The roof construction for mortarless valleys is similar to that for open grp valleys. Part 1 a guide to roof construction covers an overview of flat and pitched roofs. 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. Often people use special valley tiles that are curved to make a seamless tile 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. However these can only be used where the pitch of the two roofs is the same. These valleys have large upstands each side of the upstand to direct water towards the gutter. This recommendation includes iko s premium shingles.

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