Stronghold ICF - FD Series

The Benefits of Stronghold ICF Folding Blocks

Stronghold ICF’s folding blocks are designed for efficiency, convenience, and cost savings while maintaining the superior strength and insulation benefits of insulated concrete forms. Here’s why builders love them:

Efficient Storage & Transport – Folding ICF blocks lay flat, allowing for 50% more blocks per truckload, reducing shipping costs and job site clutter.

Easy & Fast Installation – The pre-formed hinges allow for quick unfolding and stacking, making setup faster and more efficient than traditional rigid blocks.

Less Job Site Waste – With a compact design, there’s less packaging waste and fewer cut-offs, keeping your worksite cleaner and more cost-effective.

Durable & Strong – Made from high-quality EPS foam, Stronghold ICF blocks provide excellent insulation, soundproofing, and resilience against extreme weather.

Space-Saving Storage – Contractors can store more blocks on-site without taking up excessive space, improving organization and workflow.

Stronghold ICF’s folding blocks make ICF construction easier, more cost-effective, and more efficient. Build smarter with Stronghold ICF!

FD Blocks Fold to Half Inch

FD Series Block Types and Sizes

FD Straight Block

Straight blocks, sometimes referred to as standard blocks, make up between 75%-85% of a typical ICF project.

Stronghold ICF FD Straight Block
Core Width Form Width Form Length Form Height Surface Area Concrete Volume
6" (152mm) 11.5" (292mm) 48" (1219mm) 16" (406mm) 5.33sf (0.49 m²) 0.11 yd³ (~0.084 m³)
8" (203mm) 13.5" (343mm) 48" (1219mm) 16" (406mm) 5.33sf (0.49 m²) 0.15 yd³ (~0.114 m³)
10" (254mm) 15.5" (394mm) 48" (1219mm) 16" (406mm) 5.33sf (0.49 m²) 0.165 yd³ (~0.126 m³)
12" (305mm) 17.5" (445mm) 48" (1219mm) 16" (406mm) 5.33sf (0.49 m²) 0.198 yd³ (~0.152 m³)

FD-Series 90° Corner Block

90° Corner blocks make up between 10%-20% of a typical ICF project.

stronghold icf corner block
Core Width Form Width Form Height Exterior Long Leg Length Exterior Short Leg Length Exterior Surface Area Interior Long Leg Length Interior Short Leg Length Interior Surface Area Concrete Volume
6" (152mm) 11.5" (292mm) 16" (406mm) 40" (1016mm) 24" (610mm) 7.11sf (0.66 m²) 28.5" (724mm) 12.5" (317.5mm) 4.56sf (0.42 m²) 0.11 yd³ (~0.084 m³)
8" (203mm) 13.5" (343mm) 16" (406mm) 42" (1067mm) 26" (660mm) 7.56sf (0.70 m²) 28.5" (724mm) 12.5" (317.5mm) 4.56sf (0.42 m²) 0.15 yd³ (~0.108 m³)
10" (254mm) 15.5" (394mm) 16" (406mm) 44" (1118mm) 28" (711mm) 8sf (0.74 m²) 28.5" (724mm) 12.5" (317.5mm) 4.56sf (0.42 m²) 0.18 yd³ (~0.134 m³)
12" (305mm) 17.5" (445mm) 16" (406mm) 46" (1168mm) 30" (762mm) 8.44sf (0.78 m²) 28.5" (724mm) 12.5" (317.5mm) 4.56sf (0.42 m²) 0.22 yd³ (~0.167 m³)

Find out more about the Stronghold ICF FX Series Fixed Web Blocks - available now!

Ready to Start Your Next Project

Whether you're planning a new home, commercial build, or foundation, we’ll provide personalized pricing based on your project details and location. Fill out the form below, and a member of our team will contact you with a customized estimate.

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