How Do You Build A Roof Valley

On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel.

How do you build a roof valley.

To shingle out of the valley with laminated shingles lay a shingle down as a gauge and mark the corner at the bottom left and top right of the roof. The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection. To secure the roof valley flashing nail it down carefully. The blind valley roof can be used to calculate valleys for roofs with unequal slopes.

Do the math on a calculator so that you can concentrate on what s important. Things you ll need 2 in 10 in 5 1 cm 25 4 cm wooden beams laser distance measuring device plywood sheets carpenter s framing square round saw nails hammer ceiling joists asphalt shingles. Next you will need to use the wall plate to rest the rafters on. Start by cutting the angles of the rafter s tail ends as well as the vertical cuts that are needed at the rafter tails.

I then move the shingle to the uppermost course on the roof plane line up the mark on the shingle with the valley center and again mark the corner. Then starting at the base of the. You can build a valley rafter very simply. If doghouse dormers or shed dormers aren t dressy enough a dormers can add an exciting design note and they re easier to seal against the elements.

Ensure ice and water protector has been installed along the valley first. Only nail at the edges with only enough nails to. Framing a dramatic dormer. 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.

Framing a roof valley. Getting the rafters right.