Ask an Expert

The best sealant to stop water entering your garden shed would be Selleys Brick and Concrete silicone. This is a highly flexible sealant that withstands building movement and has superior adhesion and resistance to water.

We understand that most shed installers do recommend to seal around the inside of the shed not the outside. If you do seal the outside any water running down the walls can pool in the metal channel and overflow back into the shed so it is important to not block the joins at the corners on the outside or any drainage holes.