What should be avoided when installing vapor retarders in an attic?

Leaving gaps between sheets of vapor retarders in an attic is critical to avoid, as it compromises the effectiveness of the vapor barrier. Vapor retarders are designed to prevent moisture from passing through and causing problems like mold growth, wood rot, and insulation deterioration. When there are gaps, moisture can infiltrate, bypassing the barrier’s protective qualities. Proper installation involves ensuring that sheets of vapor retarders are laid tightly against one another, with overlaps where necessary to create a continuous barrier. This prevents any paths for moisture to escape into the insulation or the attic space, thereby maintaining the integrity of the overall insulation system.

Other practices, such as using multiple layers of material or flexible materials, can have their own benefits and applications. Using adhesive to seal edges is also a common practice to enhance the alignment and seal of the vapor retarder, further preventing gaps. However, the primary concern in the context given is maintaining a continuous, unbroken layer to effectively protect against moisture.