Our family had Interlock installed on a house 40 years ago and it looks great today Port Alberni, BC Home / Reviews / Canada / British Columbia, Canada 🇨🇦 / Port Alberni, BC ★★★★★ 5/5 British Columbia Roof Reviews Our family had Interlock installed on a house 40 years ago and it looks great today. I just had slate black installed in 2024 on a different house for a great look and reduced maintenance. Art W.Port Alberni, BC