Can I leave ICF Block exposed to ultraviolet rays for extended periods of time?
Exposure of up to a year should not pose a serious problem. However, a light oxidation layer will develop on the surface of the forms after extended periods of exposure. This oxidation does not indicate any detrimental effects to the wall form. However, if the proposed finish is to be stucco (or another hard-coat material), it requires the oxidized layer to be brushed away to provide a clean bonding surface.
