Discuss gas fire builders opening. in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Breeze blocks are not approved material for chimney openings, unless you render them with a minimum 25mm deep, of strong cement mix.Stick marble to wall and put some breeze blocks up the back of them marble, stops the stress on the marble when you cable tie the fire back
as aw said brick work up to the marble to stop stress cracking from heat ,how we do it purpose brick chamber in a u shape all round,at the sides of the chamber at the top cement forming a slope so debris falls behind the appliance ,sometimes a lintel is required to seal to the top of the marblebest to brick up to size of marble if suitable, stops heat stresses/chance of damage on the marble, sometimes a catchment area being to big can cause flue performance issues.
the bbu was prob on a slab, so will need some building work anyway, so just do it propa like.
would only liner if the flues shot,if its a typical 6 or 8 pot set up would do a flue flow test and check it only exits one flue if it exits more than one mid feathers(divisions between flue ways)have failed and lining is the only option if your to proceed with gasI normally do get my builder in the Fire Shop Company said na dont need to builder to do any work, cowboys, customer wants a new liner put down rather be safe then sorry i just want it done correctly, So would you guy fit a flue box or plate at the bottom of the liner
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