{"id":4428,"date":"2025-11-25T16:48:49","date_gmt":"2025-11-25T15:48:49","guid":{"rendered":"https:\/\/avant4degres.fr\/?page_id=4428"},"modified":"2026-08-13T20:27:18","modified_gmt":"2026-08-13T18:27:18","slug":"isolation-acoustique-3","status":"publish","type":"page","link":"https:\/\/avant4degres.fr\/en\/isolation-acoustique-3\/","title":{"rendered":"Isolation acoustique #3"},"content":{"rendered":"
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Isolation acoustique #3<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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25 novembre 2025<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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L\u2019une des cl\u00e9s de l\u2019isolation acoustique, c\u2019est la masse<\/strong>. Lorsque l\u2019on double l\u2019\u00e9paisseur d\u2019une paroi simple, on obtient un gain d\u2019affaiblissement de 6 dB (c\u2019est la loi de masse). On va donc privil\u00e9gier des mat\u00e9riaux lourds<\/strong>. D\u2019apr\u00e8s Juguin & Coulon (2023), l\u2019indice d\u2019affaiblissement acoustique d\u2019un mur en briques de terre crue de 8 cm d\u2019\u00e9paisseur avec enduit de finition \u00e0 l\u2019argile est de 43 dB.<\/p>

Il existe une autre solution\u00a0quand on ne peut pas apporter de la masse\u00a0: la double paroi<\/strong>. Le syst\u00e8me de double paroi repose sur le principe masse-ressort-masse<\/strong>. Le r\u00f4le du ressort est de d\u00e9solidariser les deux parois afin d\u2019att\u00e9nuer la transmission solidienne<\/strong>. Une simple couche d\u2019air peut jouer le r\u00f4le de ressort, mais pour optimiser le syst\u00e8me, on ajoute habituellement un isolant dans l\u2019espace entre les parois.<\/p>

Attention, un isolant rigide comme le polystyr\u00e8ne extrud\u00e9 ou expans\u00e9 ou le polyur\u00e9thane rigide n\u2019entra\u00eenera pas de gain acoustique,<\/strong> au contraire\u00a0! Les mat\u00e9riaux rigides, de faible masse surfacique, ont en effet un grand rayonnement sonore. On se tournera donc vers des plaques de Fermacell, de Placo Phonique, voire une double plaque de Placo, s\u00e9par\u00e9es par une laine v\u00e9g\u00e9tale ou en textile recycl\u00e9 souple <\/strong>(image 1).<\/p>

Il faut savoir que toutes les parois simples pr\u00e9sentent un d\u00e9faut d\u2019isolement<\/strong> \u00e0 une certaine fr\u00e9quence, appel\u00e9e fr\u00e9quence critique fc <\/sub><\/strong>(image 2). Elle d\u00e9pend de la nature et de l\u2019\u00e9paisseur de la paroi et peut varier de 3 \u00e0 10 dB. Dans le cas d\u2019une double paroi, c\u2019est la fr\u00e9quence de r\u00e9sonance<\/strong> qui fait rentrer en r\u00e9sonance le dispositif et qui constitue un d\u00e9faut d\u2019isolement.<\/p>

\u00c0 noter que le double vitrage est une double paroi<\/strong> et est donc soumis aux m\u00eames ph\u00e9nom\u00e8nes de fr\u00e9quence critique et de fr\u00e9quence de r\u00e9sonance (image 3). La nature du gaz entre les vitrages n\u2019influence pas les performances acoustiques. Il existe des vitrages sp\u00e9cifiques pour am\u00e9liorer les performances acoustiques<\/strong> (double vitrage asym\u00e9trique, double vitrage int\u00e9grant un vitrage feuillet\u00e9 acoustique).<\/p>

\ud83c\udfa8 Les illustrations ont \u00e9t\u00e9 modifi\u00e9es d\u2019apr\u00e8s mes cours d\u2019acoustique du Master \u00c9coconstruction de Cergy.<\/p>

\ud83d\udcd6 Juguin T., Coulon S. (2023) – Construction en terre crue. Caract\u00e9risation acoustique<\/em>, rapport d\u2019\u00e9tude, 24 p.<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tJe veux am\u00e9liorer l'acoustique dans mon logement<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Isolation acoustique #3 25 novembre 2025 L\u2019une des cl\u00e9s de l\u2019isolation acoustique, c\u2019est la masse. Lorsque l\u2019on double l\u2019\u00e9paisseur d\u2019une paroi simple, on obtient un gain d\u2019affaiblissement de 6 dB (c\u2019est la loi de masse). On va donc privil\u00e9gier des mat\u00e9riaux lourds. D\u2019apr\u00e8s Juguin & Coulon (2023), l\u2019indice d\u2019affaiblissement acoustique d\u2019un mur en briques de […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ocean_front_end_style_editor":"no","ocean_post_layout":"full-width","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"off","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"on","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"off","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","footnotes":""},"class_list":["post-4428","page","type-page","status-publish","hentry","entry"],"yoast_head":"\nIsolation acoustique #3 - Avant 4 degr\u00e9s<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/avant4degres.fr\/en\/isolation-acoustique-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Isolation acoustique #3 - Avant 4 degr\u00e9s\" \/>\n<meta property=\"og:description\" content=\"Isolation acoustique #3 25 novembre 2025 L\u2019une des cl\u00e9s de l\u2019isolation acoustique, c\u2019est la masse. 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