Table of Contents
How do you tie into existing shingles?
The easiest way to tie in the new shingles with the old is with a cut valley (see Four Ways to Shingle a Valley). After the addition roof is framed and sheathed, snap a line on the existing roof shingles 2 in. up from the valley center, and cut through the shingles and underlayment.
How do you join two roofs together?
How to Join the Roof Pitches? Step 1 – Preparing the Area. Step 2 – Measuring the Length of the Joined Area. Step 3 – Prepare a Piece of Flashing Material. Step 4 – Place the Flashing on the Meeting Point. Step 5 – Sealing the Edges of The Roof with Lumber. Step 6 – Apply a Bead of the Sealant Material.
How do you attach a lean to roof to an existing roof?
You’ll need to remove the existing shingles and cut back the existing eaves to make room for the shed roof, then nail a two-by-six ledger board on the existing roof; the ends of the shed rafters will rest on this ledger. The other end of the shed rafters will rest on a horizontal beam supported by posts.
How do you join two roofs of different pitches?
Position the flashing between the two roof pitches. Slide the right edge of the flashing under the highest roof pitch. Place the 2-by-4-inch piece of lumber along the center of the flashing. Gently bend the flashing using the edge of the lumber until both sides of the flashing match the slope of the two roof pitches.
How do you blend old shingles on new roof?
How Can I Blend Existing and Replacement Shingles? If you’re looking to blend new and old shingles, saving shingles from your original roof installation is an excellent first step. If shingles have faded, try going a shade lighter with the same manufacturer.
Does a rafter need a Birdsmouth?
Structurally, a rafter sitting on an angular bearing point (the inclined plane of the ripped strip) would require that the rafter-plate connection deal with the horizontal and vertical components of the force differently than with a birdsmouth.
How do you make Birdsmouth?
So, to summarise, the full process is as follows: Calculate pitch of roof. Use roof pitch to cut ridge cut. Use ridge cut as point of reference to form birdsmouth. Make tail cut.
Can you put flashing over shingles?
Flashing should overlap the roof-covering material, but on asphalt shingle roofs, for aesthetic reasons, the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs. Wind-driven rain can enter at these gaps, causing roof leaks.
How far should flashing go under shingles?
Second, step flashing needs to extend 8 to 14 inches above the shingles, according to the National Roofing Contractors Association (NRCA). Also, before you start installing your flashing, you need to look to see if the wall in question has a corner on the roof face, as in the image below.
How do you nail a birdsmouth rafter?
At the birds’ mouth cut of a rafter connecting to the top plate we use three nails per side, two down through the top of the birds’ mouth into the top plate and one (on either side) of the rafter’s vertical portion of the bird’s mouth cut into the face of the top plate.
Is Blocking between rafters necessary?
Rafter blocking is an essential part of the roof framing process in that the blocks provide a stop for ceiling insulation and a continuous surface for the roof sheathing to be edge nailed to.
How do you cut birdsmouth on a shed rafter?
On the rafter, you want to cut, measure its overall depth, and divide it by 3. Using this figure, measure and mark two points on each side of the vertical line, which indicates where the birdsmouth will be cut.
How much pitch do I need for a lean to roof?
Lean To Shed Roof Design Designing a lean to shed so that it can work with either a low slope metal panel or a modified asphalt shingle installation is done by making the slope 2 in 12. This allow the builder to install either panel no matter what the choice of roofing material is.
How far should shingles overhang drip edge?
Asphalt shingles should overhang the exterior edge of the drip edge by ¼ to ¾-inch. Check local building code for drip edge requirements prior to the start of your roofing project.
Should I tear-off old shingles?
In most cases, more than two layers of roofing shingles does require a tear-off. Laying new shingles over old shingles is easily prone to leaks and reduces the life of the new shingles. This alone ought to be reason enough to do a tear-off; it’s just a bad value not to.
Do you install drip edge before tar paper?
The best way is to install the roof drip edge only along the eaves first, then place ice-and-water barrier (in the snowbelt) or felt paper (underlayment) over the drip edge.
What is ridge roll?
Also known as a dry ridge, a ridge roll serves the purpose of keeping moisture from penetrating into the roof from outside. Accordingly, ridge rolls are water-repellent. Moreover, ridge rolls also serve to ensure that air may pass outside so that the roof is ventilated.
