THE CJK APPROACH TO BUILDING SUNROOMS
When we construct a sunroom (or any other building) we understand the importance of the insulation and how essential it is to be installed correctly. We take this element very seriously and always use the highest quality materials available.
Most sunrooms have vaulted ceilings and this is where conservatories preform really bad, the heat loss from a roof is a great concern as warm air always rises. Roof insulation in a sunroom is essential to get right and we mostly use YBS supper foil for the 1st layer (it helps to create a more air tight barrier), and then 75mm of Polyisocyanurate (PIR) rigid insulation boards, all with the necessary air gaps required. This process is essential to preform correctly as badly fitted insulation will generate high heat loss caused by cold spots. We always tape any joints and make sure all the insulation is cut correctly and installed to the manufactures standards. Any area that we feel is a potential heat loss, an example of this is where the rigid insulation meets the walls will be filled with expandable foam to help seal that area (please see the photographs of the insulated vaulted ceiling)
Although it is not required for extensions to have an Air Permeability Test to assess how air tight a building is, we always work to a standard that would pass this test even though it will never be carried out.
Should you require we are more than happy to discuss your options to reduce the U-value of your proposed sunroom making it more thermally efficient.
Firstly, increase the thickness of the PIR insulation in the vaulted ceiling by 25mm this will reduce the U-value of this area from 0.18 W/m² to 0.15 W/m²which equates to a reduction of 20% in heat loss from this area.
Secondly, if you upgrade your full fill cavity wall insulation from 0.37 to 0.32 grade you can reduce your U-values from 0.28 W/m² to 0.23 W/m² which equates to just over a 20% reduction in heat loss from this area.
These two above mentioned insulation upgrades do not incur any extra labour charges as you are already carrying out the process of the installation, the only charges you will experience is that of the increased material cost.