TR-16 – Eaves Detail: Pitched Warm Roof with Vaulted Ceiling

This vaulted ceiling warm roof eaves detail shows a typical pitched-roof junction with a sloping internal ceiling.

The detail illustrates rigid insulation fitted between the rafters with a continuous insulated layer beneath, together with the plasterboard lining following the roof slope. It demonstrates how the roof insulation should pass over the wall plate and connect with the cavity-wall insulation to maintain a continuous thermal envelope at the eaves.

A brick-faced version of this vaulted warm-roof eaves detail is also available. For broader guidance on moisture and condensation, consult Approved Document C.

Supporting notes cover:

• Structural design of rafters, ridge beams, purlins and trimmers.
• Wall plates, restraint straps and rafter anchors.
• Rigid insulation between and beneath the rafters.
• Sealing joints and perimeter gaps.
• Insulation continuity at the eaves and ridge.
• Ventilation between the insulation and roofing underlay.
• Low-level eaves and high-level ridge ventilation.
• Use of certified low-resistance roofing underlays.
• Roof-level cavity closers and cavity barriers.
• Vapour-control and airtightness membranes.
• Service battens beneath the vapour-control layer.
• Sloping plasterboard ceiling finishes.
• Underlay, battens, roof covering, fascia, soffit and guttering.
• Junction SAP reference E11 and the calculated PSI value shown on the drawing.

The customer receives one downloadable PDF construction detail, drawn at a scale of 1:10 and arranged for an A3 sheet.

Rafter sizes, insulation thicknesses, ventilation, vapour control and roof coverings must be coordinated with the structural design, approved energy calculation, condensation-risk assessment and manufacturers’ installation requirements.