Partial Fill Cavity Wall Insulation – Design Guidance
To prevent thermal bridging Ballytherm boards should be fitted tightly to the edges of door and window openings. Lintels, which support the inner and outer leaf, should have internal insulation or be packed with Ballytherm insulation (figure 18).
Where radon barriers and cavity trays bridge the cavity, the insulation should be extended to the underside of the barrier or tray, and then continued immediately above it.
Further Advice & Information
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