Building with Foam Blocks: A Guide to Effective Construction

Thermal bridging is a crucial consideration in building construction, as it can significantly impact the energy efficiency and overall performance of a structure. In this article, we'll explore the process of thermal bridging and how foam blocks play a vital role in minimizing heat transfer.

The key to effective thermal insulation lies in the path of least thermal resistance (R-Value). Testing has shown that beyond 5” of foam, added insulation provides little benefit due to the concrete mass's ability to slow down thermal bridging. Industry standards recommend using 2 ½ inches of foam for optimal results.

Foam blocks come in various thicknesses, including 1 ½”, 2”, and 2 ½”. The spacing between vertical nailers can range from 6”, 8” or 12”, depending on the manufacturer's specifications. These plastic webs serve as nailers or strapping for interior and exterior finish attachments.

Molded plastic webs are an integral part of foam block technology, providing a seamless connection between blocks. Most manufacturers offer comprehensive training and technical support to ensure successful installation. Installer manuals, pre-engineered tables, CAD details, and engineering models are also available to facilitate the construction process.

Bracing systems are essential for maintaining the integrity of the structure during and after the pour. These systems feature adjusting turnbuckles that allow walls to be perfectly straightened as the concrete is finished. Vertical steel reinforcement is placed before each pour, and cold joint dowels can be used to tie subsequent pours together.

The concrete is typically poured one level at a time, with foot plank brackets providing support for planking and stacking forms. When walls become too high to reach from the ground, specialized bracing or alignment systems are installed to ensure proper alignment.

ICFs (Insulated Concrete Forms) offer unparalleled design flexibility, allowing builders to construct complex radius walls, multiple elevations, and architectural features with ease. Some foam blocks are fully reversible, making construction even more efficient.

Manufacturers also provide a range of accessories and fittings, including corner blocks, 45-degree blocks, brick ledge forms, and taper top blocks. The most common wall sizes are 6” and 8”, while the thickness or width of the cavity can vary from 4 to 12 inches or more.

The evenly spaced webs within foam blocks provide strength and stability, making them an ideal choice for building construction. With proper installation and care, ICFs can ensure a long-lasting, energy-efficient structure that meets the needs of both builders and occupants.

By incorporating foam blocks into your building design, you can create structures that are not only thermally efficient but also aesthetically pleasing. Whether you're working on a residential or commercial project, ICFs offer an unparalleled level of flexibility and versatility. With careful planning and execution, foam blocks can help you build a structure that stands the test of time.

Building with foam blocks