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This detail shows an eaves detail between an existing solid masonry wall and a refurbished slate roof with insulation between and under the rafters.
Ventilation requirements are dependent on the existing roof requirements, insulation specification, location and exposure of the roof.
It is advisable to carry out suitable condensation risk analysis to assess potential for moisture build-up within the roof assembly. Consider factors such as insulation thickness, ventilation rates, and internal humidity levels to mitigate any risks. Equally condensation risk analysis should be carried out on any existing wall upgrades. Also consult with insulation manufacturers to ensure correction specification of their product.
This detail shows natural slates which allow for some background passive ventilation of the batten void, do not use this detail with flat or artificial slates. Ventilation requirements will need to be calculated based on roof location, orientation and exposure.
Roof structure is indicative and should be adapted to structural engineer’s specification.
Typical slate roof refurbished with insulation between and under rafters to achieve u-value 0.16 W/m2K.
Typical slate roof as new fabric element in existing dwelling with insulation between and under rafters to achieve u-value 0.15 W/m2K.
Features of this detail: slate roof, eaves detail, refurbished slate roof, retrofit slate roof, insulation between and under rafters, solid masonry wall, retrofit wall, internal insulation upgrade, existing wall, box eaves, pitched roof.
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