Why Do I Need To Use Twin Wall Flue Pipes?
This Twin Wall flue system will either run internally (up through the floors of the property and exiting through the roof surface) or externally (passes out through an external wall and rising up the outside of the building, clearing the gutter line), depending on your preference and the room in which you wish to locate your new stove. If you do not have an existing chimney in your home to install a wood burning stove into, a new class 1 chimney system needs to be created using Twin Wall (or Double Skin) insulated flue pipes. Planning a brand new flue system may seem daunting at first but with this guide we hope to remove the mystery of creating a twin wall installation to suit your home, avoid the common pitfalls and understand Approved Document J of the building regulations in language we can all understand ( highlighted in bold). Another 45° Elbow or Tee Piece can be connected once through the wall to turn the system vertically.Ħ) Joist Supports are sufficient for supporting an internal system with Adjustable Wall Brackets providing the support for an external system every 2m maximum.ħ) For internal systems, a Roof Support, Silicone Flashing and Storm Collar are necessary for safely passing through any roof type.Ĩ) Once through the roof Surface (internal) or past the roof/gutter line (external), Twin Wall systems must attain a minimum vertical height of 1m to create a minimum horizontal clearance of 2.3m.ĩ) Finish off any system with a choice of Rain Caps or Anti-Wind Cowls.
Quick Step Guide to Non-Chimney Installationsġ) Start your system with a length of Single Wall, Vitreous Enamel Stove Pipe in the same diameter as the outlet on the stove.Ģ) Connect a Single to Twin Wall Adapter to convert from this Single Wall Pipe to insulated Twin Wall Pipe a minimum of 150mm before reaching any surface (ceiling or wall).ģ) The remainder of the flue system must be in insulated Twin Wall Flue Pipes only from this point onwards.Ĥ) For internal systems passing up through the property, you shall require Joist Supports and Ventilated Fire Stop Plates for every ceiling the system passes through.ĥ) For external systems rising up the outside of the property, this must pass through the wall at no greater than 45° with a Wall Sleeve lining the passage through the wall itself.
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