When it comes to a metal deck project, you always need to consider which side lap connection method you will be using. There are a variety of side lap connection methods to choose from, including the button punch connection, top seam weld connection, and others.
At CSM Products & Solutions, we often get asked which side lap connection is the best to use and this is why we typically recommend the Button Punch Side Lap Connection Method. This article will talk about how the Button Punch tool performs in three different areas: consistency of side lap connection, weather tightness, and versatility. After reading this article, you’ll have a clear idea of when to use the Button Punch tool for your next project.
Button Punch Side Lap Connection Method
A button punch tool is an economical, efficient option for attaching metal deck, which is faster than welding, does not require a large amount of experience to use, and is very versatile.

Consistency of Side Lap Connection
The Button Punch side lap is a handheld tool and if not used by a professional, doesn’t guarantee consistency across the project. Given this information, a couple of factors come into play when it comes to helping with the consistency: the gauge of the metal deck and how experienced the tool operator is.
Weather Tightness
The Button Punch side lap connection method can only be weather-tight when a built-up roof system is included. However, the Button Punch connection method decreases the possibility of water penetrating through the system compared to other side lap connection methods.
Versatility
The Button Punch side lap connection can be used with any metal deck manufacturer, providing you with the versatility to use it on any metal decking project.
Why Should You Use the Button Punch Side Lap Connection Method?
On most metal deck projects, the engineer in charge determines the type of slide lap connection method. Therefore, usually, you don’t have to worry about making this decision. The engineer tends to keep in top-of-mind shear values of the product as the main factor while keeping consistency, weather tightness, and versatility as less important determinant factors.
If it’s up to you to determine which side lap connection method you should use for your next project, you have to take a few things into consideration. Most importantly, if you are looking for weather tightness, the Button Punch method would be your best choice. You’ll also want to take into consideration the type of metal decking you’re using and whether it’s interlocking or not.
Contact CSM’s Team for Additional Guidance
At CSM Products & Solutions, our sales and manufacturing teams have the necessary knowledge and tools to create a metal deck that meets your construction project’s needs. Don’t hesitate to contact us if you need guidance or recommendations on which metal decking or side lap connection method is best for your particular project. We have more than 50 years of experience and a happy to help.