A ‘blow-out’ is a break in the form, generally due to the pressure from the liquid concrete during the concrete placement and/or consolidation. Fox Blocks ICFs are designed to maintain a high safety factor of pressure from the liquid concrete. Damaged forms or failure to support areas where forms have been cut leaving a large area of EPS between the web supports may cause a blow-out. Over consolidation may also cause a blow-out.
Fox Blocks recommends the Pre-Placement Checklist be reviewed for all wall assemblies prior to the placement of concrete, to find potential problem areas and install additional strapping or support to prevent blow-outs. Generally, for an Fox Blocks form, the size of a blow-out may be limited to the EPS between the webs, 6″ or 8″ wide by the height of one form. If a blow-out occurs, the concrete pour moves to another area on the wall, the hole is patched by replacing the EPS, installing wood support over the area, and then resuming the pour.
Building with Fox Blocks ICFs provides you with a high performance wall system for the foundation and above grade walls. Building any high performance home, with either ICFs or conventional wood framing, has many factors that define the end capital costs.
What additional materials and labor are required to make a conventional foundation equivalent to an Fox Blocks ICF foundation which exceeds energy code requirements in most locations? Conventional wood framing requires considerably more material, insulation and attention to air sealing to make it qualify and perform as a high performance wall. All of this, for conventional construction, adds material and labor costs to the overall project. Fox Blocks ICFs provide a simple method to build high performance walls that provide ongoing benefits from the high insulation values and mass concrete walls that are energy-efficient and provide cost savings for the life cycle of the building.
Comparing cost per square foot between conventional construction and ICFs for a high performance building, is like comparing apples to oranges. To develop construction costs, more detailed information is required, for instance the number and size of openings, the shape and size of the home, the regional costs for material and labor, etc. If you have a project you’d like us to review and provide a material estimate, Fox Blocks would be happy to have one of our representatives contact you. Please complete and submit a lead information sheet on the website or call Customer Service.