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Blowout Prevention

Blowouts in ICFs are rare, but here are some tips on reducing the risk of such an occurrence:

Have a worker continuously tap the formwork during concrete placement to check for any voids. If a hollow sound in an otherwise solid wall is detected, dislodge the clog and fill the void by slipping a long piece of strapping or rebar into the concrete from above, and slide it up and down above the void.

A bulge in the formwork is a warning sign of a possible blowout. In this case, the placing crew should be signaled to move the pour away from the problem area. The bulge can then be braced with a 2X2-foot square of plywood wedged to the wall with a wooden kicker.

In case of a blowout, the torn foam must be cut away, and the concrete scooped out to a level below the blowout. Then, replace the foam and set a square of plywood against the wall, front and back, to cover the damaged area.

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