Roofs: How to model Fibreglass roofing

Created by Vicki Marshall, Modified on Mon, 07 Nov 2022 at 04:27 PM by Vicki Marshall


Region: All States


Assessor Question:


I have a job that has fibreglass roofing to some areas. Can this be modelled in NatHERS software and is it allowed?


TechLink Response:


  • Fibreglass or acrylic roofing may be used as veranda/pergola cover. 
  • Product-specific SHGC performance values can be used to define the seasonal shading percentage. 
  • If the fibreglass is over an internal zone, it would equate to a roof light with a very poor U-value. 
  • As such, it is likely to deliver an unacceptably low thermal-performance result.

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