Ideally, a building envelope should be insulated from the outside. This allows for a continuous insulation layer and protects the roof’s load-bearing structure from weather influences.
1. Sarking Roof Insulation (External Insulation)
From a technical standpoint, the sarking method is preferred. In this method, IKO enertherm insulation boards are installed on top of the load-bearing structure (such as rafters or trusses). The boards are mechanically fixed using battens and special sarking screws. The length of the screws depends on the insulation thickness and the height of the battens.
This technique is ideal for renovation projects where the roof covering and roof structure are being replaced. The result is excellent thermal performance without thermal bridges.
2. Internal Roof Insulation
Insulation can also be applied on the inside of a pitched roof, for example, between the rafters and optionally with an additional layer beneath the rafter structure.
Important considerations:
- Check if the roof structure is suitable for internal insulation.
- A sub-roof must be present, and it should be vapor-permeable and windproof.
- Always consult the IKO installation guidelines for proper application.
Fire-Safe Finishing
When insulating from the inside, a fire-safe finish is essential. This can be achieved using plasterboard panels, which provide additional protection and ensure a neat finish.