Cornelissen carries out fire-resistant penetration seals, fire-rated doors, windows and wall linings, recording every detail — including product certificates — in a digital fire-safety logbook for the client. The company is listed by Stichting Register Montage Expert Brandveiligheid as a certified installation company under the MEB scheme for bouwkundige brandveiligheid, registered on 2 September 2021 as the second firm admitted to that register.