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The use of thin insulation is debating. While it is clear that this is not the most thermally and acoustically efficient insulation, thin insulation can be very useful for renovations, in addition to insulation, or where no other insulation can be installed.

Presentation of thin insulation

Thin insulators are also called reflective or multilayer products, depending on the technique used. They consist of one or more layers of aluminum foil or aluminized plastic film as well as one or more intermediate layers giving the final thickness: foam plastic foam, bubble wrap, felt of vegetable or mineral origin... Depending on the number and type of intermediate layers, the thermal performance thin insulators are more or less good.

Most of the time, thin insulation is in the form of rolls. Its thickness ranging from 5 to 30 mm is much lower than that of a traditional insulation which is rather between 4 and 30 cm.

Thin insulation is easy to handle, it is generally used in insulating underlayer.

Performance of this insulation

The intrinsic thermal resistance value R of a thin insulation (product alone without a complementary air gap) is generally between 0.1 and 1 m²K / W.

The value of the total thermal resistance R (reflective product + air blades immobile on both sides of the product) is generally between 0.5 and 2 m²K / W.

The insulating power of thin insulation is 5 to 20 times lower than the thermal performance of a high performance insulation.

When used alone, thin insulation does not meet the minimum requirement of thermal regulation, so it is recommended as an additional insulation.

In acoustic insulation, the performance of thin insulation is limited. They must be combined with fibrous insulation to ensure good sound insulation.

Better to opt for a thin insulation certified or under Technical Notice whose thermal and acoustic performance has been evaluated and certified by independent bodies and according to the applicable standards.

concerning fire resistance, the regulations apply as for all insulation products. You must consult the Technical Notice to know the performance of each thin insulation.

In conclusion, thin insulation is very interesting as a insulation supplement as part of renovations, for example. It also allows the installation of insulation where there is no room for a conventional insulation.

Benefits of thin insulation

- ideal as an insulation supplement

- its small thickness allows a set up in various configurations

- easy and quick installation

- great waterproofness, it acts as a vapor barrier

Disadvantages of thin insulation

- low thermal performance if used alone

- low acoustic performance

- high cost

- environmental impact not estimated

Video Instruction: Insulating Walls with Reflective Foil Bubble Insulation