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Flat Roof Insulation

Stop heat loss, slash energy costs, and keep your building protected from the elements with proper flat roof insulation. Whether you’re tackling a new build or upgrading your current roof, our range of products has what you need for a more comfortable and cost-effective space.

worker installing flat roof insulation

Explore our insulation for flat roofs

  • Sound-absorbing trough fillers for perforated steel decks. The underside of an exposed profiled deck is acoustically reflective, which serves to increase reverberant noise in the space below, making for a noisy and echoey acoustic environment. The solution is to install ROCKWOOL Acoustic Infills into the troughs of a perforated deck. This tissue-faced product acts to absorb incident sound, reducing noise build-up, which lowers the reverberation time and creates a quieter acoustic environment.
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  • Flexible polymeric acoustic barrier for enhanced sound insulation. Complimenting the acoustic performance of HARDROCK(R) Multi-Fix, ROCKWOOL Acoustic Membrane is a high performance, sound deadening polymeric layer used to enhance the performance of an acoustic roof build-up. An ideal acoustic solution for buildings requiring an exceptionally high acoustic performance, such as schools, hospitals, cinemas, airports, arenas and leisure developments.
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  • Soffit Slab has been created to provide a cost-effective fire resistant and thermal insulation solution for structural elements such as concrete car park soffits. The Soffit Slab is manufactured from non-combustible rigid ROCKWOOL® board and has been designed with a variety of facings.
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  • Flat Roof MG is a high performance Polyisocyanurate with mineral coated glass facers suitable for use below single ply waterproofing systems and partially bonded built-up felt.
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  • FR/ALU is a high performance Polyisocyanurate flat roof insulation with vapour-tight aluminium foil facings suitable for use with single ply membranes.
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  • Thermal Ply is a composite insulated panel of Unilin Polyisocyanurate core with a composite foil face, bonded to 6mm WBP grade plywood.
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  • Tapered Roof ALU is a high performance Polyisocyanurate Tapered Roof Insulation with vapour-tight aluminium foil facings suitable for use with single ply membranes.
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  • XtroLiner Soffit Plus provides effective thermal and fire performance solutions in structural ceiling applications in commercial and residential buildings.
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A quick guide to buying flat roof insulation

A quick guide to buying flat roof insulation

Worried about dampness in your property? Incredibly chilly in the winter? Sick of spending a fortune on the heating bill? It might be time to look at insulation, and your roof is a good place to start.

When insulating a flat roof, you have two main options:

  • Warm flat roofs are the most popular method for flat roofs in the UK, and it involves placing the insulation above the roof structure, creating a thermal barrier that prevents heat loss and keeps the building warm. This method is great for reducing energy costs and is commonly used in new builds and re-roofing projects.
  • Cold flat roofs, on the other hand, have the insulation placed between the rafters or below the roof deck, keeping the roof structure cooler. While it’s often more cost-effective, careful ventilation is needed to prevent condensation.

What are the main benefits?

  • More comfortable: Roof insulation ensures a more consistent indoor temperature, eliminating the discomfort of extreme heat in summer and cold draughts in winter
  • Save money: Insulation helps cut down on energy consumption, leading to lower heating bills. Over time, the savings on your energy costs can more than pay for the investment in insulation.
  • Protection: Quality insulation acts as a barrier, shielding your roof from moisture, condensation, and other damaging effects of the weather.
  • Soundproofing: Insulation provides an extra layer of soundproofing, helping to reduce noise from rain, wind, and external sources. Enjoy a quieter and more peaceful indoor space, especially in noisy and busy areas.
  • Energy efficient: increased energy efficiency not only cuts costs but also helps reduce your carbon footprint.

Ready to upgrade your flat roof insulation? Get in touch with our team today for expert advice and top-quality products.

Frequently asked questions

How to insulate a flat roof from the inside?

To insulate a flat roof from the inside, you’ll typically use a cold roof method. This involves placing insulation material, like rigid foam boards or mineral wool, between the joists under the roof deck. Be sure to leave a ventilation gap above the insulation to prevent condensation buildup. Finally, cover the insulation with plasterboard for a clean, finished look. This approach can help improve energy efficiency without disturbing the external roof structure.

How to insulate a flat roof?

Insulating a flat roof can be done using two main methods: warm roof or cold roof insulation. A warm roof involves placing the insulation above the roof deck, creating a thermal barrier that improves energy efficiency and protects against moisture. In a cold roof, insulation is installed between the rafters below the roof deck. Both methods improve comfort, lower energy costs, and extend the roof’s lifespan.

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