Francis Rilley Specification Manager, Unilin Insulation. Francis joined Xtratherm, now Unilin Insulation, in 2017 and provides specification and technical support in Ireland. Francis with the support of the technical team regularly support self-build projects, advising on both regulation and legislation issues along with optimum fabric choices on projects. Francis has also recently completed a Passive House Designer course and can now also advise on how to achieve your low energy home.