NVQ LEVEL 2 SOLAR COLLECTOR ROOFER DMR Training is an approved assessment centre for NVQ Level 2 Diploma in Roofing Occupations. The NVQ Level 2 in Solar Collector Roofer course is for experienced roofers who meet the recognised occupational standards. The qualification is a validation of your skills and experience. The Onsite Assessment and Training (OSAT) route allows you to achieve your NVQ through workplace assessment at your own speed. This qualification is a mandatory requirement in gaining your CSCS Skilled Worker card.