Twin wall systems are a twin insulated chimney system this enables you to have a log burner if you don’t have a brick chimney. It allows you to get within 50mm of combustible material like joists and ply flat roofs.
It's important that a HETAS registered company install any chimney system and flue liner and the installation is correct to regulation and is safe. It is also important to remember that the installation of carbon monoxide alarms is now a requirement for all new or modified installations
