Upgrading the insulation of an urban family home

Upgrading the insulation of an urban family home

The Problem: How to insulate to the current requirement of U = 0.18 W/m2K with limited rafter depth but able to work from both the outside and the inside.

A mix of Edwardian & Victorian properties

Didsbury is Manchester’s most affluent suburb, popular with young professionals, students and well-off families alike. Many houses wereInsulating breather membrane residential refurbishment built during the Victorian and Edwardian eras, often making use of durable Accrington brick - whose high strength led to it being chosen for the foundations of both Blackpool Tower and the Empire State Building! – and whose distinctive red colour lends character to the area’s large houses and terraces alike.

Many a flat conversion in the 60's

Many of these large houses were converted into flats during the 1960s, but recent years have seen some of them turned back into spacious family homes. This typical rambling house with high ceilings was scheduled to be re roofed as part of the complete refurbishment of the property. Whereas once the attic dormer might just have provided accommodation for the maid, the addition of rooflights elsewhere in the space allowed additional bedrooms on the 2nd floor.

Fitting PIR

Since the ceilings were being stripped out it was possible to fit PIR board under the rafters by working from below, as well as between them, in order to achieve the Building Regs upgrade requirement of a U value of 0.18 W/m2K.

Achieving the target U Value

Although the rafters were only 75mm deep, there was sufficient headroom height to introduce insulation below the rafters, and it was also possible to raise the roof slightly by using TLX Gold taut and counter battened with a 38mm counter batten. With 50mm PIR between the rafters and 50mm below this achieved the target U value of 0.18 W/m2K.

A comparable PIR board-only solution would only have achieved 0.23 W/m2K, but by using an insulating breather membrane instead of a conventional one, a lower U value could be achieved in the same space – and with no condensation risk!insulating breather membrane taut with PIR insulation

The Solution: TLX Gold insulating breather membrane, which provides a thermal upgrade in limited rafter depth without condensation risk.

  • Can be used either taut and counter battened or draped between the rafters
  • No condensation risk, even without a vapour barrier
  • BBA Certificate - a guarantee of performance
  • U-value build ups available on the website and by request - 01204 674730

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