Warm Vs Cold Roof InsulationWhen you’re having a new roof installed, it’s always helpful to understand the different terminology – from the different materials to the specific features of the roof. And one of the common terms you’ll come across is warm and cold roof insulation.
But what exactly does it mean? Keep reading to find out…
An introduction to roof insulation
The roof makes up a critical part of a property’s envelope – along with the walls, foundations, ceiling, doors and windows – which keeps heat inside. That’s why insulation is an essential part of any roof.
Many homeowners invest in loft insulation to increase the amount of heat kept in their home. But when installing a roof, there are two types of insulation to choose from – warm roof insulation and cold roof insulation.
Cold roof insulation
Firstly, cold roof insulation is when the insulation is laid between the ceiling joists. That’s typically the case for flat roofs, meaning everything above the insulation – like the rafters – is colder than the living space.
Warm roof insulation
On the other hand, warm roof insulation is defined by insulation installed on top of the existing surface – beneath only the roofing materials. If a roof surface is in good condition, insulation boards can be secured with adhesive after brushing off any debris. The roof is completed by laying any type of flat roof covering on top to provide the final layer of protection. This insulation method ensures the entire roof structure is insulated.
Differences in performance
So, other than the location of the insulation within the roof, what is the difference between warm and cold roof insulation?
To put it simply, warm roof insulation offers higher thermal performance at the cost of a higher roof profile. Because the whole roof is insulated, a warm roof is more energy efficient than a cold roof.
Cold roofs are also vulnerable to condensation. Because of the temperature difference, warm air and moisture is drawn towards a cold roof, causing condensation to form on underlay and rafters. Understandably, having this moisture sitting in your roof can affect its structure over time. As a result, any cold roofs require suitable ventilation to prevent condensation forming.
For pitched roofs, another key benefit of warm roof insulation is that you can use the roof space. With a cold roof, anything stored in the roof space for long periods will become damp and rotten. Because warm roof insulation keeps the roof space as warm as the house, it provides homeowners with an extra bit of room for storage.
Need help with roof insulation?
Whether you’re looking a new roof, roof replacement or improved insulation, DPR Roofing can help. Based in Leeds, we are a team of expert roofers with nearly three decades of experience in all aspects of roofing. For more information on any of our services, or to arrange your free inspection and quote, don’t hesitate to get in touch with us today.