Solidly built in 1643 as a substantial private dwelling, the Paper Hall in Bradford has withstood the test of time. The English Civil War, which ended in 1651, saw many of the surrounding buildings destroyed; however, extensive restoration work completed in the 1990s has made this Grade II* listed building available for commercial use.

Having lain empty for many decades, the building was seriously dilapidated and internally was fully open, with no structural floors or ceilings. All restoration works had to be in keeping with the period of the building and in agreement with English Heritage.

Granada Secondary Glazing was tasked with reducing the building’s carbon footprint by preventing heat escaping through the original single glazed mullioned and transomed steel windows. Large amounts of noise intrusion and heat loss are a common problem for historic buildings with single glazing.

Reducing energy consumption

Single glazed steel windows offer minimal thermal insulation and usually have a U-value of 5.7 W/m2K. The installation of secondary glazing acts as a second barrier preventing heat escaping and can drastically improve thermal insulation, thereby reducing energy consumption.

To decrease heat loss, Granada Glazing advised that the horizontal sliding secondary glazing was installed with 6mm Low-E glass. Low-E glass has been specifically designed to reflect heat back into the room and can achieve a U-value of 1.87 W/m2K.

A perfect fit for all property types and styles, horizontal sliding secondary glazing is a popular choice due to its multi-functional capability. Providing high levels of thermal efficiency and enhanced security, this durable system has a long-lasting lifespan.

Preferred option

For listed properties or those within conservation areas, secondary glazing is invariably the preferred option where the primary windows cannot be changed to preserve a building’s historic charm and character.

As all Granada’s commercial secondary glazing products are manufactured to specification, the technical team can advise on the most suitable glass and product style to deliver the client’s required solution.

Complementing the aesthetics of the building, Granada’s frames were powder coated in a RAL 9005 finish and installed within the original stone reveals. Post installation, the secondary glazing has created a warmer and more comfortable environment for this ancient building’s 21st century occupants.

Contractor: NRB Construction
Products: Horizontal Sliding Units with 6mm Low-E glass

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