Duofast Coil Siding Nailer DF225C

By Robert Robillard on Tool Reviews

The folks at Duo-Fast recently sent me one of their DF225C coil siding nailers to use and review.   the DF225C is designed as a siding, decking and fencing nailer.   Timing was perfect because we were starting a barn siding project and I used the nailer to install 1 7/8″ stainless steel, ring shank nails.

First Impression:

The Duofast Coil Siding Nailer DF225C has a comfortable rubber grip and easy to use functions.  It has a plastic magazine that obviously reduces the nailers weight but I wonder how this nail will fair over time on the job-site or after a short fall.

The Duofast DF225C uses plastic collated coil nails that do not litter the installed nail with potential “rust worthy” exposed wire shards which always rust and stain the siding.  The plastic collation also means easier loading and less jamming.

A tool-less depth of drive adjustment is located near the trigger and easily allows the user to dial in the fastener depth.  For example on this barn siding job we were installing all of our fasteners flush and painting them.  On a more elaborate job we set the nails slightly and then the painter fills the holes.

As I get older I look for easier and faster ways of doing my work..  Along the same lines is comfort and reducing fatigue.  The Duofast DF225C weighs only 4.5 lbs less and does not put the stress on the shoulders and elbows that heavier nailers do over time it clearly reduces fatigue as well as allows better control of the nailer.Duo-Fast DF225C Coil Siding trim and fence nailer

Using the DuoFast DF225C nailer:

The DF225C performed flawlessly and I really liked the dial in depth of drive.  The belt loop comes in handy when you occasionally need to holster the nailer for other tasks.


  • Weight:  4.5 lbs
  • Dimensions:  12-5/8″ x 12-1/2″ x 5-3/4″
  • Collation Media:  0° Plastic Collated Coil Nails
  • Capacity: 300 CS/CI Coil Nails
  • Nail Length: 1-1/2″ to 2-1/2″
  • Fasteners:  CS or CI Series Round Head Plastic Collated Coil Nails; Smooth, Ring or Screw Shank. Stainless or hot-dipped galvanized finish.
  • Operating Pressure:  80-120 psi

The range of fastener sizes and types makes this a very versatile coil nail gun.

Overall Impression:

The DF225C Coil Nailer was lightweight, powerful and really simple to use.  Out of all the nailers I use this one has the potential to being the most versatile.   It is designed to install fasteners for siding, decking and fencing and clearly is a worthy nailer to have.   My only concern is the nail magazines lifespan on a job-site.  Its not uncommon for a nailer to be dropped, have items drop onto it or have the nailer tossed into a truck or tool box.

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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