corrugated roof

Corrugated roof panels are home roofing alternatives that are durable and easy to maintain. Besides painting the panels as shown on this page, it is essential to get the right-sized screws so the roof panels are correctly held in place and will not have leaks.

Your roof can flop due to broken fasteners, poorly installed pins, worn-out sealing washers, or wrong screws. This guide takes you through how to screw corrugated roof panels, screw pattern to use, type of materials, size of screw, and design.

Let’s get started!

Why Use Screws for Your Corrugated Roof Panels?

It is easy to disregard small but crucial things like screws in your construction project. For example, for corrugated roofs, screws make less than one percent of the roof installation total cost, but lack of them can result in 100 percent disaster of your roof.

Screws are a critical piece of any metal roofing project. Screwing corrugated roofs means joining metal panels to the construction structure. Therefore, always use the correct type of screws to make your panel strong.

Factors to Consider When Choosing Screws for Your Roof

Several factors determine which screw suits your specific application. Below are various aspects to consider to choose the right screws for installing corrugated roof panels.

1. Screw Material

The material used to make a screw is a paramount factor to consider. Most screws come from coated metal. However, you should choose both the metal and coating based on the materials the screw is joining together.

Galvanic action between different metals can lead to untimely fastener failure leading to leakages. Sometimes even stainless screws can severely rust under good conditions. Therefore, you can opt for galvanized screws and plan to swap them later with larger screws after zinc depletion.

2. Length

Always consider the length of the screws for your corrugated roof panel. You can measure fasteners from below the head down to the tip. Ensure the screws are long enough to fully join all the piles of materials, including the length of the drill.

Ensure the screw’s length covers the sheet’s thickness and the full height of the groove. It should also have at least two to three full-thread penetration on the bottom substrate, i.e., steel purlins or structures.

3. Washers

Washers play a vital role in thwarting leakages and adding in back-out resistance. Also, washers act as a barrier between two different metals. The presence of moisture along with conductive washers leads to electrolysis hence building higher corrosion. So, always pick a screw with a non-conductive rubber washer.

4. Head Shape

There are two major corrugated roof panel screws heads, the pancake, and the hex head. Hex head screws offer the best fitting stability compared to pancake head screws.

Pancake head screws mainly work in concealed fastener panels upon limited space in the panel’s joint. Hex head screws have a break under the flange of the head to hold a sealing washer. Besides, pancake head fasteners come with a recessed shape in the head for fitting.

What Is the Right Screw Size to Use for Corrugated Roof Panels?

Screws play an essential role in ensuring that your roof is robust. However, different screw size variations are available for different roof types.

Below are various screw sizes to use when fixing your corrugated roof panel.

1-Inch Screw

The metal roofing panelling ought to end up to about two to three inches below the house’s vented ridge. Also, the screw should be two to three inches beyond the roof’s attics. The 1-inch screw penetrates only ¾ inch.

1½ -Inch Screws

You can use the 1½ -inch screw all through your corrugated roofing project and end up with a penetration of about 1¼ -inches. The screw holds the metal roof panelling firmly, making it the standard size for metal roofing.

¼-Inch Screws

The trim of a corrugated roof uses ¼ -inch screws at two-foot increments. The trim is serrated at the center and then bolted into a place using small screws.

5/16-Inch Screws

The “r-type” corrugated roofing panelling uses 5/16-inch screws in the space of 4-foot up to the point where the panels overlap on the roof.

Screw Pattern for Corrugated Metal Roofing

There are two types of patterns when it comes to corrugated roofing screw placement.

Installing in The High

Screws on the high side of the sheet stop dirt and water from collecting behind it. The accumulated debris rolls off the sheets, lessening the chances of the screw getting spoiled by water or weakening the joint.

Installing On the Low

Screws installed on the low of the corrugated roofing panel offer a more secure connection but will be less weather-tight. The screws wad better once attached in the low, whereby you can change the metal roofing panel once you tighten up the screw.

Where to Screw Down Corrugated Roofing?

Most corrugated metal roofing sheets come with drilled holes from the manufacturers. When screwing through the holes, make sure that there is ample space for rubber washers to move around.

Corrugated roofing materials such as galvanized steel require enough space to contract and expand during hot and cold weather. Always consider the same when screwing your roof panel.

Screw Drill Points

A drill point is among the most misinterpreted parts of a screw. The screw drilling point has various resemblances like the head types and size though each serves a diverse purpose.

Self-Drilling Screw

The screw’s tip comes with a drill point capable of drilling a hole while forming the joining threads. A self-drilling screw drills its hole mostly in metal applications.

Self-Tapping Screw

This is a screw designed to tap threads into the material. Self-tapping screws don’t drill holes, but you must pre-drill a hole before installation.

Final Words

Tightening the screws properly on your corrugated roof panel could be the difference between a tight roof or one that leaks. It is easy to install a corrugated roof as long as you understand the screw pattern, the screw’s length line, and points to place screws.


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