Video
Bulletin
![Maintenance Matters 10](https://www.bchousing.org/sites/default/files/styles/mobile_x1_560px_/public/rc-guide/2022-04/Maintenance-Matters-10-At-Grade-and-Below-Grade-Assemblies.png?itok=3zYPbSxm)
Most multi-unit residential buildings have multiple levels below ground level (below grade). Water ingress into these spaces is one of the primary building performance issues, a nuisance to occupants, and may result in long-term damage to the reinforced concrete structure. This bulletin looks at what maintenance must be performed, when to renew waterproofing membranes, and gives action plan tips.