Special timber sash solves conversion problem

Creative adaptation broadens scope

The substantial renovation of a commercial building into smart domestic dwellings in  London called for Mumford & Wood’s Conservation timber sash windows – with a difference.

Specialists in the manufacture of the finest traditionally styled windows and doors, Mumford & Wood could easily satisfy the requirement for a substantial order of sash windows which would remain in keeping with existing surrounding properties.  However, several of the windows needed creative adaptation to increase their capacity to cope with smoke dispersal and meet the requirements set out in Part B of the Building Regulations and BS5588.

By the very nature of a sash window design concept, only half of the total openable area can be utilised at any one time and in this case did not contribute sufficient geometric volume, that is, the amount of through ventilation required to disperse smoke build-up in the event of fire.  To maintain consistency of appearance externally, Mumford & Wood’s bespoke design expertise addressed not only the aesthetical requirements but also the ventilation specification by providing an inward opening leaf in a sash window frame.

Using one full height sash set in the inner sash run with a horizontal glazing bar correctly proportioned and positioned to replicate the meeting rails of adjacent windows, the windows, set on door hinges, are capable of opening inwards.  This provided a clear opening that complies with the 1.5m2 geometric volume in accordance with the current legislation requirement for ventilation and control.

[an error occurred while processing this directive]

This type of window must essentially open automatically and this called for the application of actuators linked to the smoke detectors.  The specific windows for the lift well were supplied to site by Mumford & Wood without ironmongery and the main contractor brought in specialists; S E Controls of Lichfield, Staffordshire who designed and fitted the AOV control gear and smoke detection.

More information: www.mumfordwood.com