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Aluminium foil + bubble + aluminium foil
Due to the special composition of multi-layers of insulation. It effectively deals with all forms of energy transfer (i. E. Conduction, convection and radiation).
It works most effectively by reflecting infra-red radiation. This means that not only it is effective in winter by reflecting heat back into the building and cold out, but also in summer it is a very effective solar over heating barrier reducing the need for artificial cooling systems, preventing uncomfortable heat build up in the roof.

The introduction of a unique method of stitching reduces cold bridging commonly seen with other multi-foil insulation material. ---(ybsinsulation)

Bubble Foil Reflective Insulation is made of typical bubble wrap sandwiched between two layers of reflective foil surfaces. Bubble Foil Reflective Insulation reflects 96% of all radiant heat, which helps keep houses cool in the summer and warm in the winter.
It can be used in residential construction in attics, walls, ceilings, and radiant floor heating applications.
It is also used in industrial/commercial buildings, agricultural buildings, and warehouses.
A multi-layer air bubble film insulation with aluminium bonded to either one face or both faces.
The aluminium is coated with polythene to give durability and corrosion resistance. Therefore creating a fully waterproof insulation system.
A high performance insulation material which acts by trapping air within its structure creating low emissivity air spaces which enhance its total thermal capabilities.
Can be used to enhance 'U' values in traditional cavity wall construction to meet and exceed current Building Regulations. (just-insulation)
One question we are frequently asked is: "Should I insulate my roof or my ceiling. " This depends where you live. If the weather gets hot, and cooling is a major expense, insulate the roof. This stops heat from getting into your garage, stopping it at the roof line. If the weather gets very cold, and heating is a major expense, then insulate the ceiling. This will allow you to insulate and heat a smaller portion of the building.
The easiest time to install Reflective Insulation is during construction