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Article Date: 11th January 2017

Selectaglaze - Grade II Listed Townhouses Refurbished for Continued Hotel use in Marylebone

Secondary Glazing - The Portman Estate - Secondary Glazing Systems

Selectaglaze - Gloucester Place

Selectaglaze secondary glazing assisted with the renovation of six Grade II Georgian Townhouses situated in Gloucester Place, London into a comfortable and peaceful hotel.

The Portman Estate has been regenerating its large portfolio for the last 15 years, taking its buildings to the highest of 21st century standards whilst making sure it retains the beautiful historic features of the buildings.

Gloucester Place is the most recent of The Portman Estate’s refurbishment projects, nestled in London’s West End, covering 110 acres of Marylebone. A lot of the buildings along Gloucester Place were constructed between 1787 and 1792, the terraces were added at a later date and finished in 1820.

The Portman Estate’s directly managed portfolio will be further advanced in the next 7 years with 13 new and refurbished retail units, over 180,000 sq. ft. of new and refurbished office space, as well as 4 new hotels.

The townhouses were characteristic of the Georgian period containing ornate cornices and skirtings inside a uniformed exterior brickwork with balconies and cast iron railings. The six townhouses underwent an extensive renovation, in a conversion of the properties into one large hotel. A key issue during the transformation was the original windows, which were draughty, thermally inefficient and allowed noise ingress – not a calm environment for guests of a hotel.

Because of the Listed status of the buildings, replacing the existing windows was not possible, so an alternative solution was needed. Thanks to a good working relationship spanning a number of years, The Portman Estate was advised by Selectaglaze on the best secondary glazing application for their requirements.

Selectaglaze - Gloucester PlaceSelectaglaze installed in excess of 80 secondary glazed units. The Series 90 was used on the larger windows up to 3m high and used up to 10.8mm thick glass. It is a heavy duty vertical sliding unit with specialist balances, permitting large and weighty panels to operate with ease. The moment thicker glass is used, combined with a gap between the primary and secondary glazing of at least 100mm; they work together to stop the glass from resonating and allowing sound through. This significantly reduces outside noise from entering into the room. By using an acoustic laminated glass, sound is absorbed even further, resulting in noise reductions of at least 46dB.

All the secondary glazed units were fitted with low-E glass, which provides U-values of around 1.8, to aid in the reduction of heat loss throughout the building. The inclusion of bespoke fixings to guarantee the tightest fit and high performance seals minimises air leakage and draughts, making the environment more comfortable and thermally efficient. Selectaglaze secondary glazing units match existing sight lines when possible to make them virtually unnoticeable and as a fully reversible adaptation; they are accepted by most heritage bodies.

With fifty years’ experience, Selectaglaze has been working on all manner of buildings from Listed museums to new build hotels. Selectaglaze works with clients to ensure their requirements are met to make buildings warmer, quieter and safer.

Selectaglaze will showcase a range of its products between the 18th and 19th of February 2017 at The Listed Property Show, Olympia London. It is a free two day event for all those looking at heritage building renovation. This event brings together the industry’s best, all in one place. Selectaglaze will exhibit on both days at Stand B22.  To view upcoming events Selectaglaze will be attending please click here.

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