Does Roof Flashing Go Under Siding?

Having a good roof over your head is very important because it shields you away from external intrusions. Installing extra protective layers on the roof is quite challenging because one wrong move can ruin all your effort. If you are keen on knowing about roof flashing, you're on the right page because we have done proper research to give you all the information you need to know. 

Roof flashing is used where the roof and wall meet. It should be installed under the roofing material and behind the siding. Metals like galvanized steel, copper, aluminum, and stainless steel are used to make roof flashing.

To know more about roof flashing and where to place them properly, keep reading further as we have gathered enough information to help you. 

New House Peaks and Dormers, Does Roof Flashing Go Under Siding?

What is Roof Flashing?

Installing new roof with nail gun and shingles

When it comes to roofing, a lot of attention is directed to shingles roofing. Not much attention is given to roof flashing. Roof flashing is a thin metal sheet used to divert water away from roof seams and joints where moisture could seep in and cause water damage. Water cannot seep below your shingles if underlayment and roof flashing are not used.

Certain portions of your roof depend on roof flashing. The areas where the roof surface meets a wall, such as the sidewalls and front walls, as well as the valleys, or low spots where two roof slopes meet, are of particular importance. The rakes and eaves are the roof's protrusions and margins, respectively.

One of the most frequent causes of roof leaks is damaged or badly installed roof flashing, particularly around the chimney, roof cricket, or dormer. It might cause deck collapse and wood decay.

Does Roof Flashing Go Under Sliding?

Roofer Applying Caulk to House Chimney Flashing

Roof flashing must be folded out over the roof for at least 8 to 10 inches before going beneath the bottom two rows of siding. Where a roof and wall meet, step flashing is utilized.

To assist protect the building envelope from the elements, professionals frequently install flashing underneath siding in places like butt joints. 

The metal flashing behind the butt joint serves as a barrier against water infiltration and as a shield against UV deterioration of the house wrap. Z-flashing is an additional type of flashing beneath the siding. Over horizontal wood trim pieces, such as the decorative trim bands and doors or windows, Z-flashing is necessary.

How to Install Flashing in a Roof

It's essential to protect a new roof's integrity and prevent any damage from occurring later when installing a roof. Here are the procedures for installing or replacing roof flashing because it may be necessary to do so during a roof's lifespan.

To install the task of roof flashing, only a few simple tools and supplies are required.

  • Caulk for roofs
  • Galvanized nails for roofing
  • roof-nailing gun
  • Metal snips
  • The step flashes
  • a corner flash
  • Using a hammer or pry bar, remove any old shingles or flashing

First Put in The Underlayment

Under the shingles, put in your underlayment. If there are already shingles installed, they will need to be removed to install the underlayment and flashing because the shingles will need to cover your step flashing.

Attach the Corner Flashing

To build up your kick out or step flashing from the bottom up, the first Corner flashing, if necessary, must be placed down first.

Kick-out Flashing Installation

Work your way up, then add the kick-out flashing. At the base of the roof, install the kick-out flashing and use roof cement to attach it to the wall.

Install the First Shingle

With roofing cement and a few nails, put the first shingle in place so that it covers the kick-out flashing and starter strip. Put the nails high up on the shingle so they will be covered by the flashing piece in the following step for a smooth appearance

Lay Shingles Over the Flashing

Lay your shingles over the kick-out flashing and the newly installed first step flashing. You ought to be able to cover the joints of these with your shingle to provide the appearance of a smooth surface.

Fit Your Flashing

Your flashing and shingles should be specially cut and fitted to the peak of the roof. To create a curved application and keep that connection neat and water-tight, your flashing and shingles will bend over the top of the roof.

What Do You Put Between Siding and Ground?

Have you ever wondered how near the ground your siding needs to be when constructing a new home? The recommended distance between the ground and siding will be specifically examined in this article. For the siding's long-term safety and protection, your clearance is crucial.

Your siding will age more quickly the closer it is to the grade. This also suggests that the higher the siding is above grade, the more probable it is that it will remain intact and endure any moisture issues you could have, preventing genuine flooding concerns.

You can use Vinyl siding materials.. it is affordable, durable, and reliable. Vinyl materials should be above seven inches above the ground level. Another material to use is wood siding. It is expected to be six inches above the ground. Wood can last for many years if properly maintained. 

Another material to place between sidings and the ground is fiber cement materials. it should also be kept a few inches more than five above the ground. Fiber materials are not prone to be affected by insects and rot. It can last for over 50 years with the proper maintenance.

You can also use metal siding. They are durable and the easiest materials to maintain. You can either choose zinc, aluminum, copper, or steel. Metal sidings can last as long as forty years. 

Do Flashing Go Over or Under Ice and Water?

The waterproof roof underlayment membrane known as "peel and stick" or "ice and water protector" was created to shield vulnerable roof regions from ice and water damage.

Bitumen that has been polymerized is used to create ice and water shields, also known as ice and snow shields in cold areas. 

After you have set the drip edge at the eave, you must attach the ice and water guard straight onto the roof deck. Roof felt and other underlayments should be installed after the ice and water protection. Placing ice and water protector underneath flashing is recommended around roof structures like dormers and chimneys.

How Do You Fill Gaps Between Walls and Roofs?

Closeup of new plain red clay tiles and lead flashing on a pitched roof

Caulk and expanding spray foam are two common sealants for this kind of situation. Both will aid in bridging the space between your wall and roof and insulate your house

Where Should Drip Edge be Installed?

Unless local codes require differently, the flashing should always be fitted with the drip edge with the felt on the eaves side and the side of the rake. A different method of installing drip edges may be necessary for some regions.

The drip edge should always be installed with the gutter as its inside. The water is to be directed into the gutters as a whole. It ought to never be put outside of the gutter.

The drip edge on the rakes must consistently extend past the drip edge on the eaves for proper water drainage. If you complete the eaves first, this will function properly. Last but not least, attach the drip edge flashing to the rakes.

Does Drip Edge Go On Before Fascia?

Without a drip edge, a roof's surface tension can cause water to be drawn into the sheathing's end grain, damaging the fascia and the building underneath.

A metal drip edge will aid in protecting the underside of the roof sheathing, but if it is positioned too close to the fascia board, it may still attract moisture into the fascia.

The drip edge should be spaced from the fascia board by roughly a finger's breadth for optimal installation. The shingles should also protrude 3/8 to 1/2 inches past the drip border.

Can Mice Get In House Under Siding? 

Grey rat near wooden wall on floor. Pest control

Mice continue to be a widespread household nuisance. Finding their entry points and blocking them off is the best long-term solution to the mouse problem.

Finding mouse access locations can be laborious and frequently calls for a qualified expert. Mice can easily squeeze themselves through any opening larger than a cent.

Where the exterior siding joins the foundation is one of the most typical places where mice can enter a house.

Mice may be able to make the quick ascent up the foundation and smuggle themselves into the walls if the aluminum or wood siding does not meet flush with the concrete. This gap is frequently invisible since it can only be seen by looking up from the ground.


Roof flashing is very important in homes. It helps you save against harsh weather. Roof flashing is of different types and different grades. Whatever you choose, always ensure you stick to the proper maintenance routine.