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Where To Screw Metal Roofing

Metal To Light Gauge Metal Screws

Screwing Metal Roofing. Correct & Incorrect Way Of Fastening A Metal Roof Pre-Drill Screw Guns

This type of screw can be used on a metal roofing or siding job. For a metal roof, the most common application is attaching to metal purlins. For a metal siding job, its an attachment to metal studs.

You will use this type of screw when the thickness of the metal purlins are 14 or 16 gauge. An example of this type of screw is a #12-14 Impax.

Metal To Heavy Gauge Steel Screws

This type of screw will be used when the thickness of the steel is up to thickness or greater. As the steel gets thicker it becomes harder to fasten directly to the steel. The two most common types of screws that are used in this application are #12-24 Impax 4.5 self driller and #12-24 Impax 5 self driller.

Dewalt Screw Gun Kit With Collated Drywall Attachment

DEWALT products are still the go-for units when shopping for the high-performance and convenient screw gun models. The DEWALT Screw Gun Kit with Collated Drywall adds to its name a slim nose and removable shoe, giving you the leeway to work even in the tightest corners of a metal roof. The installation of the collated drywall screws to this unit is a breeze, thanks to its lock-on feature that facilitates a straightforward installation.

Moreover, this model permits a 360-degree rotation on the screw gun, allowing you to choose the best positioning when executing your job. The flexibility in the positioning and completion of the tasks is also enhanced by its tool-free length adjustment with descent marks to guarantee a straightforward setup for varying screw lengths. This variation and length adjustment unit ensures that you can reach various parts of a metal roof with minimal change in your position.

You can consistently install the screws at varying depths through its tool-free length adjustment, and the cleaning of its attachment is forthright due to its tool-free spring removal. Working with these tools requires an assurance of your safety. This model guarantees the safety of your hands as its collated strip guide averts the interference of the collation to your hands.


Release button to permit tool-free attachment

Tool-free scale length adjustment

Full 360-degree rotation n screw gun

Slim nose and removable shoe for easy access to tight places


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Kynar Paint And 24 Gauge Steel Vs Siliconized Polyester Paint And 29 Gauge Steel

The third comparison between the standing seam metal and pole barn metal roofing is the thickness of the steel and the grade of paint. Many homeowners make the assumption that pole barn metal is going to last a life time of 50 years, and that it will be the last roof they have to put on. But the thing about 29 gauge steel is what its made of will rust completely through creating pin hole in the roof some where between year 15 and 20. Many of the pole barn metals are formed out of material that is only 29 gauge when you include the thickness of the paint.

Standing seam metal roofing is most commonly made of 24 gauge steel with much higher tensile strength. The much thicker steel equals much longer life and the Kynar paint means that the standing seam roof will not only last, it will still look great as it ages. Kynar paint keeps its color even after years of harsh sun, wind and rain.

Siliconized polyester paint is what is used to give color to pole barn metal and it quickly fades, chalks, and peels leaving the metal roof with poor appearance and greatly diminished curb appeal. We consistently see chalking, peeling, and rust on pole metal years 12 to 18. Kynar paint is guaranteed for 35 years.

Slope/pitch Of The Roof

Metal ROOFING SCREWS: (250) 10 x 1

The pitch of a roof makes all the difference when choosing between these two systems, especially because it can cause a failure and damage to occur if the pitch does not work well with the profile.

  • Choose standing seam if: Your roof is a .5/12 pitch or higher for mechanically seamed profile and 3/12 or higher for snap-lock profile.
  • Choose exposed fastener if: Your roof is NOT low slope, meaning its a pitch of 3/12 or higher.
  • Choose neither if: Your roof is flat. Metal roofing is not recommended for flat roofing structures.

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Disadvantages Of Standing Seam Metal Roofing

HIGHER COST One of the most significant drawbacks to standing seam metal roofing is the fact that is can be more expensive when compared to other metal roofing types, especially exposed fastener systems. However, its not always the highest price, as metal shingles and other stamped metal materials tend to come in at a higher price, even though stamped materials are often made from 26 gauge or thinner substrates.

LESS QUALIFIED CONTRACTORS AVAILABLE Finding a contractor who is qualified, skilled, and experienced in metal roof installation is crucial, especially because standing seam systems require careful craftsmanship. Since standing seam installations may be considered too complicated or tedious, there are far fewer contractors to choose from who have a proven track record and the relevant experience.

LABOR-INTENSIVE INSTALLATION PROCESS For exposed fastener systems, its a relatively simple process of putting the material on the roof deck and nailing/screwing it down. For standing seam, its much more complex and labor-intensive, and may include:

NOT FOR USE ON A FLAT ROOFING STRUCTURE Standing seam systems are not suitable for buildings or homes that have a roof below a .5/12 pitch . These flatter pitches do not allow water to adequately drain, which could lead to premature degradation, color changes, and the overall failure of the panel system. Furthermore, snap-lock systems should not be installed below a 3/12 pitch.

Corrugated Screw Location For Wall Panels Or Metal Siding

There will be five panel screws and one lap screw per screw line. The lap screw is the screw that sits in the high and it is designed for a light gauge metal to light gauge metal connection. Lap screws are spaced 12 to 18 on center. The panel screws are spaced out so that every third corrugation has a screw including both sides of the panel sidelap. When the corrugated sheeting is 39 wideinstead of 37 wide the screw placement will be slightly different as shown in the diagram below.

We recommend that you use double sided mastic tapeat the panel sidelap for a wall condition also. The mastic tape will make the panel more weathertight. Mastic tape is always used for a metal roofing installation. On a wall application, mastic tape is shown in our installation guide and we do recommend that its used. The reality is many installers choose not to install the mastic tape for wall conditions.

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Inspect The Screws Quality And Structure Before Installation:

Like metal sheets, screws also have different structures and quality parameters. Make sure to choose the right type of screws with higher quality according to the type of metal sheets. If the screws are not good in quality of infrastructure, you cannot screw them down efficiently.

Therefore, its better to inspect the screws even after installation from time to time for any manufacturing fault. Consequently, seasonal changes may also change the infrastructure of screw rubber.

Long Life Fasteners Why Developed How Superior Warranty Implications

Standing Seam Metal Roofing Vs Corrugated Screw Down Metal Roof – Big Differences between the Two

Long Life capped fasteners were developed to provide a fastener that is warranty compatible with galvalume panels. They are also applicable where no red rust corrosion of the head is desired. Market warranties for these items are specific to the manufacturer .

The ZAC warranty covers structural failure of the fastener due to red rust corrosion of the head for the life of the building

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Exposed Fastener Metal Roofing

Exposed fastener metal roofing is defined as a roofing system where the panels are fastened to the structure through the face of the metal and directly into the roof deck or framing below. The panel edges lap one another, and the fastener goes through both layers of metal. Its called exposed fastener because the head of the fastener is visible and not hidden by a seam. An exposed fastener system is typically considered the economical choice of metal roofing and is classically used on residential, structural, industrial, and agricultural buildings.

Compare Standing Seam Metal Roofing To Screw Down Metal Roofing

Fri, May 1, 2020 @ 10:13 AM|Perry

Metal roofing tends to get lumped together into one big group of roofing when in reality there are many different types of metal and categories of metal roofing. Different types of metal roofing have been designed to serve different applications and the best outcome always results from using the right type of metal roofing and profile in the applications it was designed for. There is not a one size fits all metal roof.

Over the last ten to fifteen years a screw down metal or pole down metal as it commonly called has become widely popular and is being used in about every application possible, right and wrong. The result? Leaks on metal roofs that weren’t supposed to ever leak and metal roofs not lasting even half the time that the roofing contractor said they would. A major reason for this is that the pole barn metal or screw down metal is being used in places where standing seam should have been used.

We highly recommend that pole barn metal be used on barns or warehouses whose structures were designed for this type of metal and that standing seam metal roofing be used on homes and businesses with finished interiors and whose roof has solid wood decking or open steel framing typically found on pre engineered metal buildings. In the next few paragraphs we will make three different comparisons between standing seam and screw down type metal roofing.

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What Are The Different Screw Head Types

  • Hex Washer Head The washer face provides a bearing surface for the driving sockets. These can be slotted or unslotted, although unslotted is more common.
  • Pan Head A low profile head that can be a Phillips or a square drive.
  • Flat Head This head type sinks into wood for a flush finish.
  • Oval Head Similar to a flat head, but with an oval on top for a finished look.
  • Round Washer Head Consists of a raised pan head with an integral washer formed during the heading process. The head of the screw helps prevent it from being over-driven.
  • Truss Screws Screws with a large head and low profile.
  • Flat Truss Head Screws Lowest profile head available for attaching metal to metal.
  • Wafer Head Used to attach plywood to metal.
  • Drywall Bugle Head These will fasten drywall to metal studs.
  • Pan Framing A stud-framing screw for attaching stud to track.
  • Pancake Head A very low profile head with a large bearing surface.
  • Square Trim A square drive and reduced head for tight spaces.

What Sizes Do Roofing Screws Come In

Metal Roofing Screw: (250) 12 x 1

Widely used as a home roofing option, metal roofs essential to urge the roofing sheet screws within the correct size to ensure that the roof is held properly.

Also, it is important to see for water leakages while installing a roof. Roofing fasteners manufacturers make the screws in several sizes. It is important to know the importance of those different sizes:

  • 1-inch Screws: These screws give accurate distances for metal roof paneling and have only ¾-inch penetration. Since the paneling should ideally end two-three inches below the vented ridge of the house, the 1-inch screws prove to be the right choice.
  • One 1/2-inch Screw: Considered to be the quality size, these crews are used for the metal roofing project and may penetrate up to 1 1/4 inches. It helps in holding the roof inflexible.
  • 5/16-inch Screws: These screws are used specifically to stop larger screws from overlapping.
  • 1/4-inch Screws: They are employed to affix the trim of a metal roof at two-foot increments.

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Dont Over Compress The Washers:

Most people think they can put screws on the metal roof without any knowledge and experience. But its not true. If you are also thinking like this, you will surely end up with a damaged and unsealed metal roof in no time.

No doubt, its a complicated process to put the screws on the metal roof. But it doesnt mean that you cannot do it yourself. You can surely do it but after the proper knowledge and training.

If you dont know how to do it, its better to hire professionals. The reason is that the replacement of metal roofing will surely cost you more than your budget. So, dont take the screws installation process as a DIY.

The most common issues that occur while installing the screws by an ordinary person are overtightening and under-tightening. If you think overtightening will secure the screws for a long span, you are entirely wrong.

The overtightening will lose or break the washers because of over compressing. In the case of broken washers, the metal roofing might start suffering from leakage. Similarly, the under-tightening of the screws will also cause leakage. For this, you can use the right tools and screws tightening gun to achieve moderate results.

Trim For Corrugated Metal

If you’re learning about how to screw down a metal roof then there’s a good chance you will need help installing the corrugated metal trim or the corrugated metal panels. Our easy to navigate Metal Roofing Learning Center has step by step installation videos for all of your corrugated trim installation details.

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Roofing Screws Metal To Wood

The most common type of metal roofing fasteners are metal to wood roofing screws. Fastener manufacturers usually specify pull-out strengths for a variety of different types of wood as not all wood is the same. This helps to determine the right fastener for your project.

An example of a fastener for a wood substrate is the #9 metal to wood screw or the #10 metal to wood roofing screw. These screws have an extra sharp self-piercing point that can penetrate 20-29 gauge steel sheeting and then into the wood without pre-drilling, slipping, or damaging the metal panels.

How To Install Screws In Metal Roof

How to install a metal roof screw

In the majority of situations, a metal roofing screw with a rubber washer and metal cap is used. With the help of a screw gun, the screw is torqued down to the panel.

Make sure to check after the drill operation if the washer is blown out or cracked anywhere. Thats because any cracking on it can create water leakage into your roof.

Sometimes using pre-drill screws can save you a lot of time and produce a better installation. Pre-drilling also has some benefits. It helps to guide the screw into the substrate. It ensures straight screw lines at perfectly spaced intervals.

The best process is to attach your screw with your screw sun and then drill it. In such a case, the screw is stopped after installation and proper water sealing can be ensured.

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Dewalt Drywall Screw Gun Variable Speed Reversible

DEWALT Drywall Screw Gun is another powerful and fast model developed by DEWALT. The unit boasts unsurpassed durability and long life due to its helical-cut and heat-treated gears. The longevity of this model is also enhanced with its construction material, metal, and rubber material. This means you will enjoy the top performance for the longest time with the Dewalt drywall screw gun.

Besides, it is characterized by high torque, hence perfect for deck building drywall. The heavy-gauge steel stud framing also enhances its high performance in metal roofing.

Since you will require different speed options for unique metal roofs due to variations in tensile strengths of the metal material, its idealistic to try this model due to variable speed options. You can choose the preferred speed to insert the squire at the appropriate point.

Its nosepiece system is integral in setting the screw depth. You will realize a consistent fastener depth while its excellent ergonomics design will provide you with the least user fatigue. Your comfort and ease of use are also guaranteed with its two-finger trigger.


Heat-treated gears and helical-cut steel for durability

Metal gear housing for enhanced reliability

Depth Sensitive

Exemplary ergonomics and compact design to minimize fatigue


Work area limited by cords

Screw Lengths For Metal Roofing

The length of the screw is measured differently depending on whether the screw is a hex head or a flat head. Hex head screws will be measured from the bottom of the hex head and flat head screws are measured from the top of the screw head.

Different climates and load requirements mean that the screw length will not always be the same. Every job should be treated independently.

Here are some general guidelines:

  • Standing Seam Metal Roofing – 1 pancake heads are the most typical screws to fasten the clips.
  • ½ Corrugated – The screw will fasten to the high of the panel in a roofing application. This panel is ½ in height, so you will need at least a 1.5 long screw.
  • Corrugated – The screw will fasten to the high of the panel in a roofing application. The corrugated roofing is in height, so you will need at least a 2 long screw.
  • R Panel, 7.2 Panel, and Ag Panels – The screw will fasten to the low of the panel. Screws that are 1 in length are the most common.

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