Stop Cutting Form Boards

Concrete form extenders are heavy-duty steel concrete forming tools that slide over the end of a form board to fill gaps without cutting. They lock in place using a tension fit design. No stakes, nails, or extra equipment needed.

FormExtenders slide directly onto the end of your existing form board and extend the length to fill whatever gap remains. The tension fit design holds the extender firmly in place during the pour. When the job is done, they slide off and are ready to reuse on the next job site.

FormExtenders save time, cut material waste, and improve efficiency on every pour. Instead of cutting boards to fit, you grab the nearest short board and drop in a FormExtender for the remaining length. The result is straighter formwork, less scrap, and a faster schedule from setup to pour.

The 4" Starter Kit is designed to fit standard 2x4 lumber. This is the most common board size used in residential concrete forming systems. They're built for flatwork construction applications like patios, sidewalks, driveways, and hardscape borders.

Yes. FormExtenders are a practical solution for forming around fixed obstacles like sprinkler heads, pavers, deck posts, and plastic edging. Instead of removing the obstacle or cutting a board to fit around it, you use a FormExtender to bridge the gap and keep your layout intact. They work well alongside other concrete accessories and rebar accessories already in your workflow.

Yes. MudMixer FormExtenders are made from durable galvanized steel and designed for repeated use. Once the concrete has set and the forms are ready for removal, the extenders can be slid off the 2x4 boards and saved for future concrete projects. 

No additional nails, screws, or tools are required to attach FormExtenders to standard 2x4 lumber. Their patent-pending tension-fit design holds the extender in place on the form board. However, standard form supports and bracing are still necessary to properly secure the overall concrete formwork.