2019-12-16
Everything you need to know about the use of loose-fill insulation for unused roof space
The use of loose-fill mineral-wool and cellulose insulation in unused roof space is now mainstream, but what are the consequences of this?
On June 9, 2016, the Commission Responsible for Issuing Technical Appraisals (CCFAT) decided to remove the area of application of the method and, because of its widespread use, the use of loose-fill mineral wool and cellulose made of ground newspaper in thermal insulation processes for the floors of unused roof spaces.
This means:
- After June 30, 2018, requests for Technical Appraisals and Technical Application Documents in the area of application covered by this decision will no longer be accepted.
- On June 30, 2020, the area of application covered by the decision must be removed from Technical Appraisals and Technical Application Documents. Those in the area of application covered by this decision will be canceled on that date.
Sound implementation
Feedback and experimentation on both types of loose-fill products demonstrate that the blow-in installation is now sound.
By becoming mainstream, they are subject to the NF DTU 45.11 standard, which will enter into force in early 2020. This standard replaces the Technical Appraisal (ATec) and Technical Application Document (DTA). As part of this transition, and pending entry into force of NF DTU 45.11, the CSTB has implemented the Transitional Technical Assessment (ATT), which enables stakeholders to continue using systems under good operating conditions.
ACERMI remains the certifying authority that attests the performance of installed products over time. When NF DTU 45.11 becomes effective, ACERMI will continue to certify the performance of both products by referring to this standard for their installation.
DTU: definite advantages
A Document Technique Unifié (DTU) is a unified building code that provides standard implementation specification clauses for building construction. Widely used in France, it facilitates and forms a contractual basis for the work of installers. The DTU also provides a clear benefit to insurers. It guarantees that work on a building is performed in accordance with industry standards to reduce the risk of sickness or loss. For products that have entered the mainstream, the risk of poor workmanship is low.
