About Us
The Lincs Group LTD, a prestigious family run company of 30 years. Now supplying DIY & the trade
ConsultationContact Info
- Boston, Lincolnshire
- 01205 212305
- info@lincsgroup.uk
- Mon - Friday 0900 to 1700
About Us
The Lincs Group LTD, a prestigious family run company of 30 years. Now supplying DIY & the trade
ConsultationContact Info
- Boston, Lincolnshire
- 01205 212305
- info@lincsgroup.uk
- Mon - Friday 0900 to 1700
Energy saving warm roofs
What Is A Warm Roof?
A warm flat roof is a type of flat roof, that has insulation above the roofing joists or rafters, but below the weatherproof covering, which in this case would be the EPDM rubber.
A warm roof makes the entire structure warm by preventing any cold or thermal bridging.
Current Part L regulations (June 2022), stipulate 150mm of rigid insulation. This amount improves the thermal efficiency dramatically, as well as significantly increasing sound reduction.
Why Use A Warm Roof?
Energy efficiency: By the installation of a warm roof, the room below will benefit from being warmer in the winter and cooler in the summer. This can lower energy bills and improve carbon emissions.
Less damp potential: Older flat roofs which were insulated with wool type (also known as rockwool) insulation, were fitted between the joists with no damp proof membrane or ventilation. This has low energy performance & can cause damp or condensation.
Building Control Compliant: 150mm rigid insulation complies with Part L of the building regulations,.
Warm Roof vs Cold Roof
A cold roof is a roof which has the insulation placed in between the roofing joists. This type of system rarely uses any form of damp proof membrane and so requires some form of ventilation, often through the fascia.
This can allow for cold bridging through the joists, making it a less energy efficient method. As mentioned, it also requires ventilation, which is not always viable or aesthetic.
The benefit of a cold roof as opposed to warm roof however, is that it does not require an increase in roof height, which can be an issue in some cases. By adding between 25mm and 125 to the roof height as well as an extra layer of 18mm OSB sterling board, the roof height is increased.
Our Experience And How Its Done
• Installation of firings if needed to create a steeper roof gradient for water dispersal.
• 8ft x 4ft 18mm OSB sterling board fixed to the firings or joists and laid staggered.
• Damp mitigating membrane laid, & and 8ftx4ft insulation laid, again staggered.
• Top layer of 18mm OSB sterling board fitted, fixed down & into the first layer of OSB.
• Installation of rubber and finished to the roof requirements.
This system creates is a sandwich effect on the insulation, providing a structurally sound flat roof. EPDM is also designed to contract & expand with temperature fluctuations, a perfect solution to an insulated flat roof!
