On flat roofs, speed matters. The **SunTube25 flat EPDM** kit arrives with an insulated upstand pre‑clad in EPDM so installers bond the base quickly and focus on positioning the crystal glass dome and reflective tube. That dome stays clear and quiet, resisting UV and dirt to preserve light capture over time. The 25 cm tube diameter suits bathrooms, WCs and tight corridors, transporting daylight efficiently down to the easy‑click diffuser. The compact roof opening keeps detailing simple, while elbows and extensions let you route around services. If thermal targets are a priority, add the EcoPower glazing element to reduce heat loss and help prevent condensation. With **SunTube25 flat EPDM**, small interior spaces gain authentic daylight from a neat, durable roof detail.