SpeedyR Tabless Batts friction-fit between wood studs and do not require stapling.
For most areas, vapor retarders should be installed on the warmin-the-winter side of the insulation (toward the interior). A vapor retarder is any material that limits or restricts the transmission of water vapor.
Common vapor retarders include kraft or foil facings adhered directly to fiber glass insulation and nylon or polyethylene films applied over insulation filled building cavities.
For some warm and humid areas, vapor retarders—if used—should be installed outside the heating or building envelope. It is not appropriate to install kraft faced fiber glass with the facing toward the exterior. Check local practice and/or building codes before installation.