Conduit inox non isolé dans mes combles...

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Bonjour,
Lors de l’installation de mon foyer bois, j’ai réalisé commeprévu une isolation autour avec du placo anti feu, et laine de roche, ainsi qu’uncaisson de décompression. Le hic, c’est qu’aujourd’hui, le conduit inox simpleparoi, sort directement dans mes combles (toit fermette). Ayant mal été conseillé,je pensais que le conduit isolé style poujoulat viendrai s’emboiter sur le nonisolé en protégeant l’ensemble. Je me retrouve donc avec une partie de conduit nonisolée dans mes comble d’environ 20 cm (hauteur de l’adaptateur entre le tube200 et 230). Y a-t-il moyens de protéger efficacement cette partie (avec lainede roche) ou suis-je obligé de tout casser ??? Je suis un peu paniqué.

Merci pour vos réponses.