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Cementitious foam insulation

cement-based thermal and acoustic insulation, with an R-value which is similar to that of fiberglass; installed as a foam with a consistency like shaving cream, or as pre-cast slabs

Pronunciation
/ˌsiːmɛnˈtɪʃəs fəʊm ɪnsjʊˈleɪʃən/
/ˌsimɛnˈtɪʃəs foʊm ˌɪnsəˈleɪʃən/