Efficient & sustainable<br />bio-based insulation

Efficient & sustainable
bio-based insulation

Home Installation guide Insulation between joists

Installation guide : Insulation between joists of roof, roof spaces and floors

Roof, roof spaces and floors - Insulation between joists

Installation guide Biofib'Insulation :
Roof, roof spaces and floors - Insulation between joists

An intermediate floor, with a light structure made up of wooden joists, separates two volumes, at least one of which is heated. The insulation will consist of filling the spaces between joists with semi-rigid insulation (rolls or batts) or manually deposited fibres.

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Detailed steps

Basic rules of implementation


Store rolls and batts in their original packaging, protected from rain and direct sunlight.


Cut the insulation to the required width between supports, with an excess of 2 cm, and place the insulation under gentle compression ("spring effect") to ensure perfect contact with the uprights.


To ensure continuous insulation, take special care when sealing the joints between walls (wall / floor / slope) and checking that the strips are in perfect contact.


Ensure the maximum seal of the insulation by installing an offset, continuous vapour barrier on the inside (hot) and a roof-boarding screen that is pervious to water vapour on the outside (cold).


Install a finishing facing with maximal fire rating (mandatory).

Basic rules of implementation

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