Systèmes Sous-sol Québec is a member of 2 dealer networks of Contractor Nation and Supportworks Inc. in Quebec, which regroup ... s hundreds of the best waterproofing and foundation repair contractors in North America and the UK. We specialize in All Things Basementy!, namely, all problems affecting basements and foundations in Quebec. We do basement waterproofing, finishing, humidity control, crawl space encapsulation as well as foundation repair. read more