Hugh wrote:With Sarking(Sisalation or Thermal Break)and if its just thermal foil, I will just exclude it from composite structure(it has very small thermal conductivity and the thickness is less than a mm) or if you are considering using high performance Sisalation, I would use "Override" option from EE setting's dialogue.
Any ideas how to approach the modelling of an insulating membrane like sisalation (an australian foil facing) or the bubble wrap type insulations like Aircell ?
Hugh wrote:That's right. From my experience, Most of Australian reference guides and manufacturers provide Thermal Resistance(R) of whole composite structure. Therefore using overriding entire structure would be good option in most cases.
I am thinking that to create a Building material with a fixed R value (as opposed to a conductivity property which is applied to the appropriate skin thickness) you need to either set an override or you need to apply a specific quantity of W/mK to a predetermined thickness of the material to end up with the right R value.
Am I right in thinking you can only override the U (R) value of an entire composite in the Energy Model Review so this value cannot easily be added into the composite option except to just increase each element in the structure list by the value suggested by the mfr.