Kugadzira yakasimba uye yakakwirira-inoshanda kongiri zvimiro zvinotsamira zvakanyanya pakusarudzwa kwezvekuwedzera, izvo zvinotora basa rakakosha mukusimudzira kongiri zvivakwa. Izvi zvekuwedzera, zvakaita sedota renhunzi, cenospheres, yakawedzera perlite, hollow girazi microspheres, kongiri fibers, uye maajenti ekuderedza mvura, ari kushandura indasitiri yekuvaka nekuvandudza misanganiswa yekongiri uye admixtures.