Insulating Loft Conversions

Loft conversions insulation

For loft conversions and refurb projects using the same roof covering, Ballytherm Insulation is ideal for forming pitched roofs. Ballytherm Insulation is strong enough to span the distances between and below rafters without bowing, while its low thermal conductivity minimises insulation thickness.

The insulation boards are applied in two layers. One layer runs between the rafters, while the second extends across their underside, restrained by battens. The internal finish fixed to the underside protects the insulation itself, while the surface of the Ballytherm boards is specially reflective to reduce heat loss across cavities and further enhance the thermal performance of the roof. Consult Table 12 for the thickness needed to meet regulations.

Table 12

Further Advice & Information

For more information about Ballytherm products, technical advice, or guidance on the suitability of our products for your project, contact us at 0800 644 6900,, email us at or use our contact form.

Roof Insulation

Design Guidance