Software architecture description languages (ADLs) currently adopted by industry for software-intensive systems are largely semi-formal and essentially based on SysML and specialized profiles. Despite these ADLs allow describing both structure and behavior of the architecture, there is no guarantee regarding the satisfaction of correctness properties. Due to their nature, semi-formal ADLs do not support automated verification of the specified properties, in particular those related to safety and liveness of the specified behavior. This paper proposes a novel approach for empowering SysML-based ADLs with formal verification support founded on model checking. It presents (i) how the semantics of SysADL, a SysML-based ADL, can be formalized in terms of the CSP process calculus, (ii) how correctness properties can be formally specified in CSP, and (iii) how the FDR4 refinement checker allows verifying correctness properties through model checking. The automated model transformation from SysADL architecture descriptions to CSP composite processes has been implemented as a plug-in to the Eclipse-based SysADL Studio tool. This paper also describes an application of SysADL empowered with CSP to validate its usefulness in practice.