How To Construct A Roof Valley

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.

How to construct a roof valley.

Part 1 a guide to roof construction covers an overview of flat and pitched roofs. Closed valleys or open valleys. The three methods to shingle a roof valley. To build a hip roof start by measuring the width and height of the building you re putting the roof on.

To get started i need to know only two things. 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 first is the pitch of the roof. This roof valley is a perfect example.

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. The pitch of the old and new roofs were close but not the same so i would have to create open valleys instead. One of the details that varies between homes is the method of flashing the valley areas of the roof.

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. The roof construction for mortarless valleys is similar to that for open grp 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.

Part 3 of the four part guide to roof construction covers pitched roof detail. To understand the concept and how all the pieces are laid out and cut i picture the roof two dimensionally in plan view. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. There are two common methods for completing the flashing of a valley in a shingle roof system.

Next once you know the lengths of the rafters cut some wooden planks to size and make birdsmouth cuts in each one so. How to do a roof valley martin s roofing and guttering merton ltd for all your roofing needs. These valleys have large upstands each side of the upstand to direct water towards the gutter. Iko recommends that you install architectural shingles with the open valley method for the best roof performance.

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