Can false chimneys be provided on top of the cavity masonry separating walls?
It is acceptable to install prefabricated plastic false chimneys, which sit over the top of the cavity masonry separating wall, provided: • the junction between the top of the wall and the roof covering, including the false chimney, is fully filled by a flexible closer • all other relevant requirements are strictly followed.The required acoustic performance of any of the cavity masonry separating walls would also not be affected by the construction of a false masonry chimney at the apex of the separating wall, provided: • the construction does not involve room-in-roof situations • the construction of the false chimney does not include steelwork • the lowest point of bridging of the leaves of the separating wall, caused by the chimney construction, is at least 1m above the ceiling line • the chimney is no larger than 600mm x 600mm in horizontal cross-section • all other relevant requirements are strictly followed.
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