How To Construct A Roof Valley

However these can only be used where the pitch of the two roofs is the same.

How to construct a roof valley.

To get started i need to know only two things. 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. When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.

Then i use a construction calculator to find the correct length of each rafter. How to do a roof valley martin s roofing and guttering merton ltd for all your roofing needs. Part 1 a guide to roof construction covers an overview of flat and pitched roofs. Closed valleys or open valleys.

This roof valley is a perfect example. The three methods to shingle a roof valley. These valleys have large upstands each side of the upstand to direct water towards the gutter. The roof construction for mortarless valleys is similar to that for open grp valleys.

Then enter those measurements into an online roofing calculator to determine how long each common rafter will need to be. 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. This recommendation includes iko s premium shingles. There are two common methods for completing the flashing of a valley in a shingle roof system.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance. Next once you know the lengths of the rafters cut some wooden planks to size and make birdsmouth cuts in each one so. The pitch of the old and new roofs were close but not the same so i would have to create open valleys instead. Where the pitches are not the same the batten spacing runs out of sync.

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. To build a hip roof start by measuring the width and height of the building you re putting the roof on. 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.