Warm Roof Insulation in Dublin

Warm Roof vs Cold Roof: What's the Difference?

In a cold roof, insulation is laid at ceiling level (the loft floor) and the roof space above stays cold and ventilated — this is standard attic insulation. In a warm roof, insulation is placed above the ceiling line, either between and over the rafters or on top of the roof deck, so the roof structure itself stays warm. Both are legitimate approaches; which one suits your home depends on how the roof space is used.

Warm Roof Insulation for Pitched Roofs

For converted attics, vaulted ceilings, and rooms-in-roof, a warm roof is usually the only option, since there's no accessible ceiling line to insulate at loft-floor level instead. This is exactly what our rafter-level roof insulation service delivers, often paired with spray foam insulation for a fully airtight seal around awkward junctions.

Warm Roof Insulation for Flat Roofs

For flat roofs, a warm roof is the recommended construction method: insulation sits above the roof deck, directly beneath the waterproof membrane, keeping the deck itself warm and significantly reducing the condensation risk that a cold flat-roof build (insulation below the deck, ventilated void above) can carry over time.

Cost & SEAI Grants

Warm roof insulation is eligible for SEAI grant support as part of the roof or attic insulation measures — see our SEAI grant amounts and eligibility guide for the full breakdown, or our insulation cost guide for typical pricing. Exact cost depends on roof size, pitch, and current construction, confirmed at survey.

We install warm roof insulation across Dublin and beyond, including Swords, Bray, and Drogheda. Request a free survey to find out which approach suits your roof.