The systems house has also updated the original version covering England, which was launched at the FIT Show with information on how all its window systems can meet a U-value of 1.2 W/m2K.

The new regulations in Scotland that come into force in December will also require a 1.2 U-Value, while in Wales it will be 1.3 from November.

The publications aim to clarify any confusion among fabricators due to differing calculation methods across the three countries.

The guides, including detailed drawings of chambers and reinforcements, are available to be downloaded.

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