Could someone please advise on the correct construction of a class 1 chimney for a Stovax Riva Series 2 inset stove? Architect's drawings dont show the construction and lack any significant detail and two HETAS stove installers have indicated that the our construction of the external chimney breast is not correct.
Firstly we have created a 100mm cavity with grey internal blocks and bricks on the outer skin. 50mm rigid board insulation used inside the cavity but we since understand that we need concrete blocks rather than the light ones we have used and rigid board insulation cannot be used so only fire retardant rock wool.
We have created an opening for the inlet / cassette stove which is 35cm deep but understand this needs to be a bit longer (maybe 50mm?).
Our chimney will have one 45 degree bend before going straight up.
Could I pls get some views here on whether a twin insulated flue is the best way to go and what that consists of? Is the metal flexible liner not sufficient for a wood burner?
Thx.
Firstly we have created a 100mm cavity with grey internal blocks and bricks on the outer skin. 50mm rigid board insulation used inside the cavity but we since understand that we need concrete blocks rather than the light ones we have used and rigid board insulation cannot be used so only fire retardant rock wool.
We have created an opening for the inlet / cassette stove which is 35cm deep but understand this needs to be a bit longer (maybe 50mm?).
Our chimney will have one 45 degree bend before going straight up.
Could I pls get some views here on whether a twin insulated flue is the best way to go and what that consists of? Is the metal flexible liner not sufficient for a wood burner?
Thx.
