In　this　study,　unreinforced　masonry　(URM)　walls　constructed　from　concrete　blocks　and　clay　bricks　were　strengthened　using　horizontally　and　vertically　oriented　glass　fiber-reinforced　polymer　(GFRP)　grid　strips　bonded　with　sprayed　polyurea.　The　walls　were　subjected　to　diagonal　compression　loading　until　failure.　The　results　demonstrated　a　significant　improvement　in　both　the　shear　capacity　and　pseudo-ductility　of　the　strengthened　URM　walls　compared　to　their　unstrengthened　counterparts.　The　primary　conclusions　drawn　from　this　research　are　as　follows:　(1)　the　maximum　strain　in　the　vertical　GFRP　strips　increased　with　the　higher　axial　stiffness　of　the　strips;　(2)　the　discrete　vertical　strips　contributed　substantially　to　enhancing　the　shear　capacity　and　pseudo-ductility　of　the　URM　walls;　(3)　increasing　the　axial　stiffness　of　the　vertical　strips　can　alter　the　failure　mode　of　the　walls,　shifting　it　from　joint　failure　to　tension　or　compression　failure　of　the　blocks　or　bricks;　(4)　a　reduction　factor　is　necessary　to　account　for　the　potential　asymmetrical　performance　of　double-sided　strengthening　schemes　applied　to　URM　walls.　The　experimental　program　was　reported　in　a　previous　publication　and　additional　information　is　presented　in　this　paper.