How do you join two roofs of different pitches?
Quote from the video:
Quote from Youtube video: And to fix that there's a couple up generally the factors that are exchanged are the width of the overhang or the height of the fascia.
How do you flash roof valley?
Quote from the video:
Quote from Youtube video: Fold the top of the flashing over the ridge and nailed it off every 10 inches or so along the outer edge of the flashing. Now this valley will carry water off the roof.
How do I combine two roofs?
Quote from the video:
Quote from Youtube video: Together to start draw a gable roof by clicking the smart roof icon in the right toolbar then clicking each corner to outline the structure. You next draw another gabled roof.
How far from the centerline of a valley must the flashing extend?
For roofs with slopes of 12:12 or greater, valley flashing should extend not less than 8″ on each side of the valley centerline. For roof slopes less than 12:12, flashing should extend not less than 11” each side. Valley flashing should be center-crimped, painted, galvanized steel or aluminum.
Can you mix roof pitches?
3. Unless you’re absolutely sure of the effect you’re after, avoid combining different roof pitches. More often than not, varied pitches look disorganized or, worse, like a construction error. Stick to a uniform pitch, and rely on the size and arrangement of roof masses for effect.
How do you calculate Valley angle?
Hip and Valley Factor Formula
For a roof slope expressed as “X-in-12” (rise-in-run), the hip and valley factor is determined by finding the square root of ((rise/run)² + 2) for the slope of the adjacent roof sections. Divide the rise by the run (the run is 12). Square the result.
Do roof valleys need flashing?
Closed valleys aren’t required to have metal flashing, but they should have additional underlayment lining the valley, preferably a couple layers of roll roofing. You can usually see whether this has been done by looking carefully at the bottom edge of the valley.
Why should valley flashing widen at the bottom?
Valleys that widen as they descend are less likely to hang up snow and ice. Valleys of uniform width are more prone to ice damming. TYPICAL MATERIALS Open valley flashings for asphalt shingle roofs are typically roll roofing or metal. Roll roofing valley flashing for open valleys require two layers.
How wide is valley flashing?
Also, at a minimum, valley flashing must be 24 inches (610 mm) wide. Take care to understand your code’s thickness requirements for flashing, as there is often confusion about this point according to Professional Roofing.
How do you divert water from a roof valley?
Quote from the video:
Quote from Youtube video: But once the valley water diverter is installed you notice that no more water cascades over the side all water is funneled through the diverter. Into the gutter. And away from the landscaping.
How do you do a valley on a roof?
Quote from the video:
Quote from Youtube video: Press the shingles into the valley. And nail them in place. Make sure that you press the shingles far enough into the valley to prevent bridging.
How wide should a roof valley be?
Lead-lined valleys
The most common open width for a traditional valley is 125mm and this is generally satisfactory for normal domestic roofs. There are exceptions, such as low roof pitches and/or long rafter lengths and further guidance for these is available in the Lead Sheet Training Academy (LSTA) manual.
Do roof valleys need mortar?
A common misconception is that the mortar bedding is there to prevent water access. However, in reality, a valley should work correctly even without mortar. Think of double lap plain tile valleys and slate valleys; these do not use mortar.
What is the best material for a roof valley?
What is the Best Underlayment to Protect Roof Valleys from…
- Traditional Roofing Felt.
- Synthetic Underlayment.
- Peel and Stick Underlayment.
- Hybrid Installation is an Option.
What length should a valley lead be?
1.5m
Lead should be:
laid in strips no longer than 1.5m. lapped by a minimum of 150mm, where pitches are above 30°.
How thick should valley boards be?
Continuous overlaid boards should be minimum of 6mm thick plywood and butt jointed only over a supporting rafter. (Fig. 2). The width of the valley boards should extend by a minimum of 50mm beyond the edge of the valley trough.
What is a secret valley on a roof?
A GRP Bonding Gutter Jointing Strip (Secret Valley) is manufactured from glass fibre/polyester laminate with a UV-resistant polyester film on the upper face. A sanded strip is bonded along the upper face to provide a key for bedding the roof tiles into mortar.
