{"id":4801,"date":"2025-09-10T14:41:03","date_gmt":"2025-09-10T12:41:03","guid":{"rendered":"https:\/\/products.selit.com\/ratgeber-verlegeunterlagen\/wissens-abc\/vapour-barrier\/"},"modified":"2025-11-18T13:31:00","modified_gmt":"2025-11-18T12:31:00","slug":"vapour-barrier","status":"publish","type":"glossary","link":"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/vapour-barrier\/","title":{"rendered":"vapour barrier"},"content":{"rendered":"<p>\r\r\n<\/p><p class=\"wp-block-paragraph\">A moisture barrier, also known as a &lsquo;<a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;translatedWithWPMLTM&amp;quot;:&amp;quot;1&amp;quot;} --&amp;gt;&amp;amp;#13;A moisture barrier, also known as a &lsquo;vapour barrier&rsquo;, is an additional layer that protects the top floor and underlay from rising moisture from the subfloor (residual building moisture). It can be laid separately or integrated into the underlay. The sd value of a moisture protection film must be at least 75 m.&amp;lt;br\/&amp;gt;&amp;amp;#13;&amp;lt;!-- \/wp:paragraph --&amp;gt;&amp;lt;style&amp;gt;.cmtt-backlink-top, .blog_next_prev_buttons {display:none !important;}.cmtt-backlink-bottom{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}.cmtt-backlink-bottom:hover{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}&amp;lt;\/style&amp;gt; &amp;lt;script&amp;gt;\/\/ Warten bis das DOM geladen istdocument.addEventListener(&amp;quot;DOMContentLoaded&amp;quot;, function() {  \/\/ Das erste -Element mit der Klasse ausw&auml;hlen  const backlink = document.querySelector(&amp;quot;a.cmtt-backlink-bottom&amp;quot;);    if (backlink) {    \/\/ Den sichtbaren Text &auml;ndern    backlink.textContent = &amp;quot;Back to the ABC&amp;quot;;     }});&amp;lt;\/script&amp;gt;&lt;\/div&gt;\"  href=\"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/vapour-barrier\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>vapour barrier<\/a>&rsquo;, is an additional layer that protects the top floor and <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;translatedWithWPMLTM&amp;quot;:&amp;quot;1&amp;quot;} --&amp;gt;As an elastic layer under a floor covering such as laminate, parquet, or LVT, underlays improve the properties of the floor and protect it from damage. This includes protection against loads as well as a reduction in walking and impact sound. Depending on the flooring system, an underlay can also improve thermal insulation and increase walking comfort.&amp;lt;br\/&amp;gt;&amp;lt;style&amp;gt;.cmtt-backlink-top, .blog_next_prev_buttons {display:none !important;}.cmtt-backlink-bottom{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}.cmtt-backlink-bottom:hover{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}&amp;lt;\/style&amp;gt; &amp;lt;script&amp;gt;\/\/ Warten bis das DOM geladen istdocument.addEventListener(&amp;quot;DOMContentLoaded&amp;quot;, function() {  \/\/ Das erste -Element mit der Klasse ausw&auml;hlen  const backlink = document.querySelector(&amp;quot;a.cmtt-backlink-bottom&amp;quot;);    if (backlink) {    \/\/ Den sichtbaren Text &auml;ndern    backlink.textContent = &amp;quot;Back to the ABC&amp;quot;;     }});&amp;lt;\/script&amp;gt;&lt;\/div&gt;\"  href=\"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/underlay\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>underlay<\/a> from rising moisture from the subfloor (residual building moisture). It can be laid separately or integrated into the <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;translatedWithWPMLTM&amp;quot;:&amp;quot;1&amp;quot;} --&amp;gt;As an elastic layer under a floor covering such as laminate, parquet, or LVT, underlays improve the properties of the floor and protect it from damage. This includes protection against loads as well as a reduction in walking and impact sound. Depending on the flooring system, an underlay can also improve thermal insulation and increase walking comfort.&amp;lt;br\/&amp;gt;&amp;lt;style&amp;gt;.cmtt-backlink-top, .blog_next_prev_buttons {display:none !important;}.cmtt-backlink-bottom{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}.cmtt-backlink-bottom:hover{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}&amp;lt;\/style&amp;gt; &amp;lt;script&amp;gt;\/\/ Warten bis das DOM geladen istdocument.addEventListener(&amp;quot;DOMContentLoaded&amp;quot;, function() {  \/\/ Das erste -Element mit der Klasse ausw&auml;hlen  const backlink = document.querySelector(&amp;quot;a.cmtt-backlink-bottom&amp;quot;);    if (backlink) {    \/\/ Den sichtbaren Text &auml;ndern    backlink.textContent = &amp;quot;Back to the ABC&amp;quot;;     }});&amp;lt;\/script&amp;gt;&lt;\/div&gt;\"  href=\"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/underlay\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>underlay<\/a>. The <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;translatedWithWPMLTM&amp;quot;:&amp;quot;1&amp;quot;} --&amp;gt;&amp;amp;#13;The sd value is crucial for moisture protection films. The higher the value, the lower the moisture permeability, and the more effective the film is as a barrier against residual moisture. Please note: For mineral subfloors, moisture protection is mandatory to prevent damage to the floor.  &amp;lt;br\/&amp;gt;&amp;amp;#13;&amp;lt;!-- \/wp:paragraph --&amp;gt;&amp;lt;style&amp;gt;.cmtt-backlink-top, .blog_next_prev_buttons {display:none !important;}.cmtt-backlink-bottom{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}.cmtt-backlink-bottom:hover{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}&amp;lt;\/style&amp;gt; &amp;lt;script&amp;gt;\/\/ Warten bis das DOM geladen istdocument.addEventListener(&amp;quot;DOMContentLoaded&amp;quot;, function() {  \/\/ Das erste -Element mit der Klasse ausw&auml;hlen  const backlink = document.querySelector(&amp;quot;a.cmtt-backlink-bottom&amp;quot;);    if (backlink) {    \/\/ Den sichtbaren Text &auml;ndern    backlink.textContent = &amp;quot;Back to the ABC&amp;quot;;     }});&amp;lt;\/script&amp;gt;&lt;\/div&gt;\"  href=\"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/sd-value\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>sd value<\/a> of a moisture protection film must be at least 75 m.<\/p>\r\r\n\r\n\r\n<style>.cmtt-backlink-top, .blog_next_prev_buttons {\r\ndisplay:none !important;}\r\n.cmtt-backlink-bottom{\r\nbackground: #002962;\r\n    background-position-x: 0%;\r\n    background-position-y: 0%;\r\n    background-repeat: repeat;\r\n    background-image: none;\r\n    background-size: auto;\r\n  width: fit-content;\r\n  padding: 3px 10px;\r\n    padding-right: 10px;\r\n  color: white;\r\n  font-size: 16px;\r\n  font-family: 'MarkProBold';\r\n  background-image: url('https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png');\r\n  background-size: 12%;\r\n  background-repeat: no-repeat;\r\n  background-position-x: 146px;\r\n  padding-right: 42px;\r\n  background-position-y: 4px;\r\n}\r\n.cmtt-backlink-bottom:hover{\r\nbackground: #002962;\r\n    background-position-x: 0%;\r\n    background-position-y: 0%;\r\n    background-repeat: repeat;\r\n    background-image: none;\r\n    background-size: auto;\r\n  width: fit-content;\r\n  padding: 3px 10px;\r\n    padding-right: 10px;\r\n  color: white;\r\n  font-size: 16px;\r\n  font-family: 'MarkProBold';\r\n  background-image: url('https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png');\r\n  background-size: 12%;\r\n  background-repeat: no-repeat;\r\n  background-position-x: 146px;\r\n  padding-right: 42px;\r\n  background-position-y: 4px;\r\n}\r\n<\/style>\r\n <script>\r\n\/\/ Warten bis das DOM geladen ist\r\ndocument.addEventListener(\"DOMContentLoaded\", function() {\r\n  \/\/ Das erste <a>-Element mit der Klasse ausw&#228;hlen\r\n  const backlink = document.querySelector(\"a.cmtt-backlink-bottom\");\r\n  \r\n  if (backlink) {\r\n    \/\/ Den sichtbaren Text &#228;ndern\r\n    backlink.textContent = \"Back to the ABC\";\r\n\r\n   \r\n  }\r\n});\r\n<\/script>","protected":false},"excerpt":{"rendered":"<p>\n A moisture barrier, also known as a &lsquo;<a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;translatedWithWPMLTM&amp;quot;:&amp;quot;1&amp;quot;} --&amp;gt;&amp;amp;#13;A moisture barrier, also known as a &lsquo;vapour barrier&rsquo;, is an additional layer that protects the top floor and underlay from rising moisture from the subfloor (residual building moisture). It can be laid separately or integrated into the underlay. The sd value of a moisture protection film must be at least 75 m.&amp;lt;br\/&amp;gt;&amp;amp;#13;&amp;lt;!-- \/wp:paragraph --&amp;gt;&amp;lt;style&amp;gt;.cmtt-backlink-top, .blog_next_prev_buttons {display:none !important;}.cmtt-backlink-bottom{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}.cmtt-backlink-bottom:hover{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}&amp;lt;\/style&amp;gt; &amp;lt;script&amp;gt;\/\/ Warten bis das DOM geladen istdocument.addEventListener(&amp;quot;DOMContentLoaded&amp;quot;, function() {  \/\/ Das erste -Element mit der Klasse ausw&auml;hlen  const backlink = document.querySelector(&amp;quot;a.cmtt-backlink-bottom&amp;quot;);    if (backlink) {    \/\/ Den sichtbaren Text &auml;ndern    backlink.textContent = &amp;quot;Back to the ABC&amp;quot;;     }});&amp;lt;\/script&amp;gt;&lt;\/div&gt;\" href=\"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/vapour-barrier\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vapour barrier<\/a>&rsquo;, is an additional layer that protects the top floor and <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemBody&gt;&amp;lt;!-- wp:paragraph {&amp;quot;translatedWithWPMLTM&amp;quot;:&amp;quot;1&amp;quot;} --&amp;gt;As an elastic layer under a floor covering such as laminate, parquet, or LVT, underlays improve the properties of the floor and protect it from damage. This includes protection against loads as well as a reduction in walking and impact sound. Depending on the flooring system, an underlay can also improve thermal insulation and increase walking comfort.&amp;lt;br\/&amp;gt;&amp;lt;style&amp;gt;.cmtt-backlink-top, .blog_next_prev_buttons {display:none !important;}.cmtt-backlink-bottom{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}.cmtt-backlink-bottom:hover{background: #002962;    background-position-x: 0%;    background-position-y: 0%;    background-repeat: repeat;    background-image: none;    background-size: auto;  width: fit-content;  padding: 3px 10px;    padding-right: 10px;  color: white;  font-size: 16px;  font-family: &amp;#039;MarkProBold&amp;#039;;  background-image: url(&amp;#039;https:\/\/products.selit.com\/wp-content\/uploads\/2025\/09\/SELIT_Pfeil_links_weiss.png&amp;#039;);  background-size: 12%;  background-repeat: no-repeat;  background-position-x: 146px;  padding-right: 42px;  background-position-y: 4px;}&amp;lt;\/style&amp;gt; &amp;lt;script&amp;gt;\/\/ Warten bis das DOM geladen istdocument.addEventListener(&amp;quot;DOMContentLoaded&amp;quot;, function() {  \/\/ Das erste -Element mit der Klasse ausw&auml;hlen  const backlink = document.querySelector(&amp;quot;a.cmtt-backlink-bottom&amp;quot;);    if (backlink) {    \/\/ Den sichtbaren Text &auml;ndern    backlink.textContent = &amp;quot;Back to the ABC&amp;quot;;     }});&amp;lt;\/script&amp;gt;&lt;\/div&gt;\" href=\"https:\/\/products.selit.com\/en\/guide-to-underlays\/knowledge-abc\/underlay\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">underlay<\/a> from rising moisture from the subfloor (residual building moisture)&hellip;.<\/p>\n","protected":false},"author":1,"featured_media":0,"menu_order":0,"template":"","meta":{"footnotes":""},"class_list":["post-4801","glossary","type-glossary","status-publish"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/glossary\/4801","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/types\/glossary"}],"author":[{"embeddable":true,"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":4,"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/glossary\/4801\/revisions"}],"predecessor-version":[{"id":4997,"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/glossary\/4801\/revisions\/4997"}],"wp:attachment":[{"href":"https:\/\/products.selit.com\/en\/wp-json\/wp\/v2\/media?parent=4801"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}