Cathedral roofs

TJI timber joists can help cathedral roofs meet Passivhaus performance requirements. The joists come in various depths for soft or blown insulation, and thermal bridging is minimised thanks to the slender timber hardboard web. Thermal bridging can further be reduced by using either a vapour open insulation sarking board externally (also acting as the windtightness layer), and/or using insulation board internally, immediately followed by the airtightness membrane and before a service void for lighting and cabling. The roof/wall junction needs careful detailing to provide minimal thermal bridging and to satisfy aesthetic demands.

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