![]() ![]() I know that most fitters just use a mortar/Vermiculite mix.Ģ. Manufacturers of the flue pipe recommend you fitting their steel inserts (so any mortar does not touch your twin wall. ![]() I will be trying this shortly though and will update this page to see how it works (my only concern is whether the plaster might crack but if it is kept thin in the area close to the pipe maybe it will be fine). Fill the gap with mortar and then plaster up to the pipe: I know that folks do this although I do not. Let’s look at a few methods of “making good”:ġ. ![]() ![]() Rockwall is available from most builder’s merchants. Update Aug 17 2017: Duratwin have various finishing plates available via Stovefitter’s Warehouseįirst of all I fill the gap around the flue with Rockwall insulation which is A1 fire rated (the same stuff that is within the twin wall flue quite often). One of the biggest headaches with twin wall flue pipe is working out the best method for “making good” around the twin wall pipe where it passes through a wall to outside (I find the manufacturer’s parts i have discovered to all be rather lacking)… Nobody will be impressed if you leave it like this… ![]()
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