One St. Peter’s Square

One St. Peter’s Square in Manchester provides 268,000 ft² of office space in the heart of the central business district. Sensitively designed to complement the Grade II listed surrounding buildings—such as the neoclassical Central Library and the Edwardian Baroque Midland Hotel, the building has been awarded BREEAM ‘Excellent’. 

To achieve the required acoustic performance both horizontally and vertically, any potential weak points had to be investigated and it has been necessary to upgrade the curtain wall mullions. A hollow mullion is an ideal conduit for flanking sound transmission and even if all other elements, such as the floor slab, partitions or ceilings perform well acoustically, an untreated mullion can drag the overall DnFw performance of the façade below its required specification. 

To solve this, Carillion and Red Architectural used M15 V Baffle and MI6 Mullion and Transom Insert. These inserts are available for any profile and are cut to the exact internal dimensions of the mullion or transom. The range of inserts have been shown by test to be capable of improving performance by up to 9dB.