You'll need to build a ceiling frame under your existing roof. This frame will hold both the insulation and your ceiling plasterboard. A similar frame will need to be built outside for your eaves. This will allow you to attach the eave panels. You'll need an electrician to rewire your garage lights so that they are installed in front of the ceiling plasterboard. This is an involved and complex piece of carpentry work and if not done correctly could result in the frame failing or collapsing causing injury.

If you've not done anything like this before, I suggest engaging the services of a builder and getting a quote for the installation of the ceiling frame, insulation and plastering of the ceiling. This will guarantee that the ceiling frame has been installed to code and local council regulations.

Let me call on our experienced members @Dave-1 and @Nailbag for their recommendations.

If you need further assistance, please let us know.

Eric

Dave-1

Good Evening @amirwayn

@EricL has pointed out some very pertinent details. You roof and the way it has been configured/built means you will need to have addded support to carry added loading.

The tin sheets cant carry any extra weight I would think without buckling. So a frame would have to be added, maybe beams across the width of the shed and then you could frame it out to carry insulation (you would loose the height of the truss is all). The eves will be harder to work out. Tho are not really neccasary for insulating within the garage as the walls will be carrying the new load. The span of ?m will mean that your beams may need to be resonably substantial.

Dave

amirwayn

Thanks for your valuable advice.

amirwayn

Thanks for your valuable advice.

amirwayn

Thanks to everyone who contributed to answer my question.

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