Quote: above-rafter roof insulation
E.g.: sarking with the frame left exposed during a roof re-covering
Describe roof condition, use of rooms beneath the slopes and planned roofing work. Identify rooflights, chimneys, solar panels and adjoining buildings. Establish scope through a survey before comparing external and internal insulation.
Understand the scope
The insulation sits outside the roof structure. Buildwise stresses junctions with other elements: selecting the method does not itself guarantee elimination of every thermal bridge.
Inspect structure and covering
Request condition, load and fixing assessments for the proposed assembly. Distinguish reusable and replacement components from repairs that can only be confirmed after opening.
Prepare junctions
Request edge, gutter, window, chimney and façade details. Show finished levels and implications for adjoining roofs. Coordinate future façade or solar work to limit repeated alterations.
Plan weather-exposed work
Specify scaffolding, lifting, opening, temporary rain protection and interruption criteria. Clarify unavailable rooms, protection of belongings and daily checks that the roof is closed. External work does not guarantee no indoor disruption.
Confirm procedures before ordering
Check roof-alteration procedures with the municipality. For Klimabonus 2026, identify the advice or single-component route and obtain approval in principle before work. Do not assume a higher grant simply because the method is called sarking.
Indicative prices in Luxembourg
On quotation
Separate insulation, removal and reinstatement or replacement of covering, access and junction adaptations. Include identified structural repairs. Internal insulation alone is not comparable with a complete reroof including above-rafter insulation.
Subsidies and grants
No grant is deducted from the budget shown here. If a quote mentions support, request the exact scheme and confirmation of your eligibility before including it in financing.
Frequently asked questions
Will every thermal bridge disappear?
Junctions require design; the method name is not a guarantee.
Can roof tiles remain?
Check condition and requirements for removal, storage and reuse.
Is the grant necessarily higher?
Request official criteria and application confirmation, not an assumed technique bonus.
Should the slopes also be insulated inside?
Assess the complete assembly including existing layers. Combining solutions without assessment is not design.