Underdeck Insulation Of Concrete Roof

As roof alone accounts for approx. 40% to 50% of total heat gain, it is always sensible to insulate the roof. Insulation of a RCC roof can be done from the underside.

The spandrel cavity needs to be filled up with an insulation material so that conditioned air of a floor do not leak into the adjacent floors.

This requires special care:

• Possibility of an insulation material taking up the moisture from the roof should be desisted. So either use a vapor barrier in between the insulation and the roof or use a non hygroscopic insulation material.
• Screws used to fix the insulation to the roof underside should be chosen of such a material that they should not act as a conduit for heat transmission from the roof.

Suggested Materials for Underdeck Insulation:

• XPS
• Spray PUF
• Non crosslinked Polyethylene Foam