Malo osungira zinthu panja (monga ma pavilions, ziboliboli, mipanda, ma signboards, ndi zina zotero) amakhala pamalo ovuta monga mphepo, mvula, kusintha kwa kutentha, ndi zina zotero kwa nthawi yayitali, ndipo kukhazikika kwawo ndi kulimba kwawo ndikofunikira kwambiri. Monga gawo lofunika kwambiri lolumikiza kapangidwe ndi maziko, ngati bolt ya nangula sinasankhidwe bwino, ingayambitse kuti malowo apendeke, kumasuka kapena kugwa. Mabolt a nangula opangidwa ndi ma galvanized a hot-dip akhala chisankho chabwino kwambiri pamapulojekiti akunja chifukwa cha mphamvu zawo zambiri, kukana dzimbiri komanso mphamvu zoletsa ukalamba. Nkhaniyi ifotokoza mwatsatanetsatane momwe ma bolt a nangula opangidwa ndi ma galvanized a hot-dip osiyanasiyana amagwiritsidwira ntchito kuti akuthandizeni kusankha chinthu choyenera ndikuwonetsetsa kuti malowo ndi otetezeka komanso okhazikika.