Sandwich roof Panels are fast to erect and a great way of insulating at the same time as spanning larger span roofs and ceiling spaces unsupported.
Some of the disadvantages or Sandwich panel roofing are:
* When installing they are easy to scratch and dent so you must be careful and add padding to hard surfaces
* Larger spans must be supported by an under purlin /girder to ensure the roof is trafficable
* Fitting of lights & ceiling fans is restrictive and requires electricians to do a rough-in in multiple stages.
* There is no service cavity and the insulation of service must be considered at the design stage