A support member for supporting a guardrail with respect to a support post is provided. The support member comprises a body including a first portion adapted to engage a mounting area of a support post and a second portion adapted to engage a mounting area of a guardrail. The first portion comprises a mounting surface that is substantially concave from a first side to a second side of the mounting surface. The first side is provided with a first mounting protrusion and the second side is provided with a second mounting protrusion. Guardrail assemblies including a support member and methods are further provided.