Account for the added material
DASMA cautions that added weight can affect a door system designed around a particular load. Do not assume the opener can compensate or attempt spring adjustments. Have the door professional assess the proposed material and the complete system before it is attached.
Keep product claims separate
Factory-insulated construction and an aftermarket layer are different specifications. Ask what thermal evidence applies to the completed proposal and whether existing performance documentation still describes it. Do not borrow the rating of a different insulated model.
Compare an approved change with replacement
Get a written scope for any supported modification, including who confirms compatibility. If no supported option exists, compare a specified factory-insulated door against leaving the existing assembly unchanged. Include windows, seals and disposal in that comparison so the decision is about the finished project.
Your questions
Can the opener be adjusted to handle the extra insulation weight?
Do not use opener adjustments to compensate for an altered door. A trained professional must establish whether the proposed change is supported and appropriate.
Does attaching foam give me the manufacturer’s insulated-door rating?
No. A rating for another construction does not transfer to a modified door. Request evidence for the actual proposal.