Building regulations
Condensation and U-values
New build information
Home and domestic info
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Building regulations (continued)
Air Permeability and Cold Bridging
It is also a requirement to demonstrate that the quality of construction has been achieved by adopting accredited details such as the Renotherm BBA 02/3964 certificate and undertaking an air pressure test to confirm the specified design air permeability has been achieved. A limit of 10m3/m2/h at 50 Pa for air permeability is allowed. Renotherm will assist dramatically in reducing air leakage and cold bridging.
Support for the Designer
Renotherm’s technical department provides free ‘U’ value and condensation risk calculations and gives recommended foam depths to achieve the required Dwelling Emission Rate. ‘U’ value calculations are carried out using the methods in ISO 6946 (walls and roofs) and ISO 13370 (ground floors). Condensation risk analyses are calculated using the method in BSEN ISO 13788:2002 (and BS 5250 Appendix D): Code of Practice for the Control of Condensation in Buildings. Calculations can be provided for roofs, walls and floors and may be submitted to Building Control Departments to demonstrate compliance with Building Regulations.