{"id":211743,"date":"2025-05-16T12:00:13","date_gmt":"2025-05-16T16:00:13","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=211743"},"modified":"2025-05-16T12:00:33","modified_gmt":"2025-05-16T16:00:33","slug":"partition-stc-ceilings-acoustics-quiz","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/partition-stc-ceilings-acoustics-quiz\/","title":{"rendered":"How Well Do You Know Partition STC and Ceiling Acoustics?"},"content":{"rendered":"<p><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/05\/CS-MAY.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-211645 size-medium\" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/05\/CS-MAY-300x236.jpg\" alt=\"Graphic that says &quot;quiz of the week&quot; with sound waves at the bottom\" width=\"300\" height=\"236\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/05\/CS-MAY-300x236.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2025\/05\/CS-MAY.jpg 350w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>This week\u2019s quiz is from <a href=\"https:\/\/www.constructionspecifier.com\/specifying-the-four-roles-of-acoustic-ceilings\/\"><em>Sound of silence: Specifying the four roles of acoustic ceilings.<\/em><\/a> When walls don\u2019t go full height, ceiling systems become key players in acoustic performance. But not all acoustic ceilings are created equal\u2014and they\u2019re not always enough. This article breaks down how ceilings interact with partitions to achieve target Sound Transmission Class (STC) ratings, why Ceiling Attenuation Class (CAC) can be misleading on its own, and how to apply recent research and standards to real-world designs. Read on, then take the quiz to test your technical know-how.<\/p>\n<link rel='stylesheet' id='formidable-css' href='https:\/\/www.constructionspecifier.com\/wp-content\/plugins\/formidable\/css\/formidableforms.css?ver=20261026153039' media='all' \/>\n<div class=\"frm_forms  with_frm_style frm_style_formidable-style\" id=\"frm_form_58_container\" data-token=\"a19240af6bc9d44eaff686d0878fc389\">\n<form enctype=\"multipart\/form-data\" method=\"post\" class=\"frm-show-form  frm_js_validate  frm_pro_form \" id=\"form_quiz5222222222222222\" data-frm-error-config=\"{&quot;includeAlertRole&quot;:false,&quot;focusFirstError&quot;:false,&quot;focusErrorSummary&quot;:true}\" data-token=\"a19240af6bc9d44eaff686d0878fc389\">\n<div class=\"frm_form_fields \">\n<fieldset>\n<legend class=\"frm_screen_reader\">Quiz - May 20<\/legend>\r\n\r\n<div class=\"frm_fields_container\">\n<input type=\"hidden\" name=\"frm_action\" value=\"create\" \/>\n<input type=\"hidden\" name=\"form_id\" value=\"58\" \/>\n<input type=\"hidden\" name=\"frm_hide_fields_58\" id=\"frm_hide_fields_58\" value=\"\" \/>\n<input type=\"hidden\" name=\"form_key\" value=\"quiz5222222222222222\" \/>\n<input type=\"hidden\" name=\"item_meta[0]\" value=\"\" \/>\n<input type=\"hidden\" id=\"frm_submit_entry_58\" name=\"frm_submit_entry_58\" value=\"03088f249d\" \/><input type=\"hidden\" name=\"_wp_http_referer\" value=\"\/wp-json-v2\/wp\/v2\/posts\/211743\" \/>\t\t<input  type=\"hidden\" name=\"item_meta[379]\" id=\"field_72k1r433333332\" value=\"\"  data-invmsg=\"Score is invalid\"   \/>\n\t\t<div id=\"frm_field_380_container\" class=\"frm_form_field form-field  frm_required_field frm_top_container vertical_radio\">\r\n    <div  id=\"field_t8ld4433333332_label\" class=\"frm_primary_label\">1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements?\r\n        <span class=\"frm_required\" aria-hidden=\"true\">*<\/span>\r\n    <\/div>\r\n    <div class=\"frm_opt_container\" aria-labelledby=\"field_t8ld4433333332_label\" role=\"radiogroup\" aria-required=\"true\">\t\t<div class=\"frm_radio\" id=\"frm_radio_380-0\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[380]\" id=\"field_t8ld4433333332-0\" value=\"A. The ceiling panels must have a minimum NRC of 0.90\"\n\t\t data-reqmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? cannot be blank.\" data-invmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? is invalid\"   \/> A. The ceiling panels must have a minimum NRC of 0.90<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_380-2\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[380]\" id=\"field_t8ld4433333332-2\" value=\"B. The CAC rating of the ceiling panel alone must meet the required STC value\"\n\t\t data-reqmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? cannot be blank.\" data-invmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? is invalid\"   \/> B. The CAC rating of the ceiling panel alone must meet the required STC value<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_380-1\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[380]\" id=\"field_t8ld4433333332-1\" value=\"C. A plenum barrier must be installed above the ceiling and the combined CAC rating must match the STC of the partition below\"\n\t\t data-reqmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? cannot be blank.\" data-invmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? is invalid\"   \/> C. A plenum barrier must be installed above the ceiling and the combined CAC rating must match the STC of the partition below<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_380-3\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[380]\" id=\"field_t8ld4433333332-3\" value=\"D. The ceiling panel must weigh at least 4.88 kg\/m\u00b2 (1 psf)\"\n\t\t data-reqmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? cannot be blank.\" data-invmsg=\"1. When using an acoustic ceiling to supplement sound isolation for non-full-height partitions, which of the following must be true for compliance with standard STC requirements? is invalid\"   \/> D. The ceiling panel must weigh at least 4.88 kg\/m\u00b2 (1 psf)<\/label><\/div>\n<\/div>\r\n    \r\n    \r\n<\/div>\n<div id=\"frm_field_381_container\" class=\"frm_form_field form-field  frm_required_field frm_top_container vertical_radio\">\r\n    <div  id=\"field_3jgdr33333332_label\" class=\"frm_primary_label\">2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies?\r\n        <span class=\"frm_required\" aria-hidden=\"true\">*<\/span>\r\n    <\/div>\r\n    <div class=\"frm_opt_container\" aria-labelledby=\"field_3jgdr33333332_label\" role=\"radiogroup\" aria-required=\"true\">\t\t<div class=\"frm_radio\" id=\"frm_radio_381-0\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[381]\" id=\"field_3jgdr33333332-0\" value=\"A. Ceiling panel material type\"\n\t\t data-reqmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? cannot be blank.\" data-invmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? is invalid\"   \/> A. Ceiling panel material type<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_381-1\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[381]\" id=\"field_3jgdr33333332-1\" value=\"B. Ceiling panel CAC rating\"\n\t\t data-reqmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? cannot be blank.\" data-invmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? is invalid\"   \/> B. Ceiling panel CAC rating<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_381-3\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[381]\" id=\"field_3jgdr33333332-3\" value=\"C. Ceiling penetrations for light fixtures and HVAC\"\n\t\t data-reqmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? cannot be blank.\" data-invmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? is invalid\"   \/> C. Ceiling penetrations for light fixtures and HVAC<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_381-2\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[381]\" id=\"field_3jgdr33333332-2\" value=\"D. Concrete slab mass and finish\"\n\t\t data-reqmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? cannot be blank.\" data-invmsg=\"2. According to the 2021 study cited, which of the following factors had the least impact on the overall STC rating of floor-ceiling assemblies? is invalid\"   \/> D. Concrete slab mass and finish<\/label><\/div>\n<\/div>\r\n    \r\n    \r\n<\/div>\n<div id=\"frm_field_382_container\" class=\"frm_form_field form-field  frm_required_field frm_top_container vertical_radio\">\r\n    <div  id=\"field_cevco433333332_label\" class=\"frm_primary_label\">3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance?\r\n        <span class=\"frm_required\" aria-hidden=\"true\">*<\/span>\r\n    <\/div>\r\n    <div class=\"frm_opt_container\" aria-labelledby=\"field_cevco433333332_label\" role=\"radiogroup\" aria-required=\"true\">\t\t<div class=\"frm_radio\" id=\"frm_radio_382-3\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[382]\" id=\"field_cevco433333332-3\" value=\"A. Select ceiling panels with the highest possible CAC rating\"\n\t\t data-reqmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? cannot be blank.\" data-invmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? is invalid\"   \/> A. Select ceiling panels with the highest possible CAC rating<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_382-1\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[382]\" id=\"field_cevco433333332-1\" value=\"B. Ensure the ceiling panels weigh more than 4.88 kg\/m\u00b2\"\n\t\t data-reqmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? cannot be blank.\" data-invmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? is invalid\"   \/> B. Ensure the ceiling panels weigh more than 4.88 kg\/m\u00b2<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_382-0\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[382]\" id=\"field_cevco433333332-0\" value=\"C. Match ceiling NRC with HVAC sound power output\"\n\t\t data-reqmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? cannot be blank.\" data-invmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? is invalid\"   \/> C. Match ceiling NRC with HVAC sound power output<\/label><\/div>\n\t\t<div class=\"frm_radio\" id=\"frm_radio_382-2\">\t\t\t<label >\n\t\t\t\t\t<input type=\"radio\" name=\"item_meta[382]\" id=\"field_cevco433333332-2\" value=\"D.  Begin with target background sound levels and limit the HVAC equipment\u2019s octave-band sound power accordingly\"\n\t\t data-reqmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? cannot be blank.\" data-invmsg=\"3. When specifying an acoustic ceiling for mechanical noise attenuation from equipment in the plenum, what is the recommended method per ASHRAE and AHRI guidance? is invalid\"   \/> D.  Begin with target background sound levels and limit the HVAC equipment\u2019s octave-band sound power accordingly<\/label><\/div>\n<\/div>\r\n    \r\n    \r\n<\/div>\n<div id=\"frm_field_383_container\" class=\"frm_form_field form-field \">\r\n\t<div class=\"frm_submit\">\r\n\r\n<button class=\"frm_button_submit frm_final_submit has-text-color has-background\" type=\"submit\"  >Submit<\/button>\r\n\r\n<\/div>\r\n<\/div>\n\t<input type=\"hidden\" name=\"item_key\" value=\"\" \/>\n\t\t\t<div id=\"frm_field_546_container\">\n\t\t\t<label for=\"field_51gpi\" >\n\t\t\t\tIf you are human, leave this field blank.\t\t\t<\/label>\n\t\t\t<input  id=\"field_51gpi\" type=\"text\" class=\"frm_form_field form-field frm_verify\" name=\"item_meta[546]\" value=\"\"  \/>\n\t\t<\/div>\n\t\t<input name=\"frm_state\" type=\"hidden\" value=\"ZwlVcGIHPO+ZsBR607WCSt4MfJqr9RPytH+W92lxCOGxZrkd6GRkVmozbZUkv2it\" \/><\/div>\n<\/fieldset>\n<\/div>\n\n<\/form>\n<\/div>\n\n<p><a href=\"https:\/\/www.constructionspecifier.com\/tag\/quiz\/\">Take our other quizzes!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When walls don\u2019t go full height, ceiling systems become key players in acoustic performance.<\/p>\n","protected":false},"author":34186,"featured_media":211675,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9697],"tags":[9702],"class_list":["post-211743","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-quizzes","tag-quiz","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Well Do You Know Partition STC and Ceiling Acoustics? - The Construction Specifier<\/title>\n<meta name=\"description\" content=\"When walls don\u2019t go full height, ceiling systems become key players in 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