{"id":39796,"date":"2024-09-05T10:49:47","date_gmt":"2024-09-05T08:49:47","guid":{"rendered":"https:\/\/conservation-science.ch\/?page_id=39796"},"modified":"2024-09-05T10:49:47","modified_gmt":"2024-09-05T08:49:47","slug":"on-the-origin-of-the-moist-areas","status":"publish","type":"page","link":"https:\/\/conservation-science.ch\/?page_id=39796&lang=en","title":{"rendered":"On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb…"},"content":{"rendered":"
On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb…<\/strong><\/h6>\n\n\n\n
\"\"<\/a><\/td>\n\u00ab\u00a0Moist areas\u00a0\u00bb seen on buildings are usually attributed to infiltration or capillary rise, phenomena which require the presence of large quantities of liquid water in the humid area. However, in most cases, hygroscopic salts (such as chlorides* or nitrates**) which are able to adsorb easily and abundantly water vapour from the ambient air play an important role.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
When these salts are present in building materials, they are able to modify the reflection of the light of the surface of the porous material that contains them, giving it a more dark or \u00ab\u00a0wet\u00a0\u00bb look. The quantities of water and salts needed to be present within the porous material to make these optical illusions observable depends on the nature of salts, but the amount of water vapour in the air, even under \u00ab\u00a0dry\u00a0\u00bb conditions, is often sufficient. Non-destructive humidity measuring devices are usually sensitive to salts and are rarely able to distinguish between these \u00ab\u00a0harmless\u00a0\u00bb cases – although aesthetically disturbing – and cases of actual infiltration or capillary rise, but some simple laboratory tests can quickly help to overcome the indeterminacy.<\/td>\n\"\"<\/a><\/p>\n

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In conclusion,<\/strong><\/em><\/span> before beginning heavy interventions as e.g. installing a drainage system or establishing a \u00ab\u00a0capillary barrier\u00a0\u00bb of any kind, we strongly advise to measure the amount of water actually present in the walls and possibly to analyse the salts.<\/p>\n

* Chlorides may be introduced e.g. by de-icing salts;
\n** Nitrates e.g. can come from faecal matter or fertilizers.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb… \u00ab\u00a0Moist areas\u00a0\u00bb seen on buildings are usually attributed to infiltration or capillary rise, phenomena which require the presence of large quantities of liquid water in the humid area. However, in most cases, hygroscopic salts (such as chlorides* or nitrates**) which are able to adsorb easily and abundantly water … Continuer la lecture de On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb…<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":39773,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-39796","page","type-page","status-publish","hentry"],"yoast_head":"\nOn the origin of the "moist areas"... - Bl\u00e4uer - Conservation - Science<\/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:\/\/conservation-science.ch\/?page_id=39796&lang=en\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On the origin of the "moist areas"... - Bl\u00e4uer - Conservation - Science\" \/>\n<meta property=\"og:description\" content=\"On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb… \u00ab\u00a0Moist areas\u00a0\u00bb seen on buildings are usually attributed to infiltration or capillary rise, phenomena which require the presence of large quantities of liquid water in the humid area. However, in most cases, hygroscopic salts (such as chlorides* or nitrates**) which are able to adsorb easily and abundantly water … Continuer la lecture de On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb…\" \/>\n<meta property=\"og:url\" content=\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en\" \/>\n<meta property=\"og:site_name\" content=\"Bl\u00e4uer - Conservation - Science\" \/>\n<meta property=\"og:image\" content=\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en\",\"url\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en\",\"name\":\"On the origin of the \\\"moist areas\\\"... - Bl\u00e4uer - Conservation - Science\",\"isPartOf\":{\"@id\":\"https:\/\/conservation-science.ch\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en#primaryimage\"},\"image\":{\"@id\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en#primaryimage\"},\"thumbnailUrl\":\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\",\"datePublished\":\"2024-09-05T08:49:47+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en#primaryimage\",\"url\":\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\",\"contentUrl\":\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/conservation-science.ch\/?page_id=39796&lang=en#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/conservation-science.ch\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Tricks\",\"item\":\"https:\/\/conservation-science.ch\/?page_id=39769&lang=en\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Archived tricks\",\"item\":\"https:\/\/conservation-science.ch\/?page_id=39773&lang=en\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb…\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/conservation-science.ch\/#website\",\"url\":\"https:\/\/conservation-science.ch\/\",\"name\":\"CSC - Conservation - Sciences\",\"description\":\"Transmission de connaissances dans le domaine des sciences de la conservation du patrimoine b\u00e2ti\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/conservation-science.ch\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"On the origin of the \"moist areas\"... - Bl\u00e4uer - Conservation - Science","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/conservation-science.ch\/?page_id=39796&lang=en","og_locale":"fr_FR","og_type":"article","og_title":"On the origin of the \"moist areas\"... - Bl\u00e4uer - Conservation - Science","og_description":"On the origin of the \u00ab\u00a0moist areas\u00a0\u00bb… \u00ab\u00a0Moist areas\u00a0\u00bb seen on buildings are usually attributed to infiltration or capillary rise, phenomena which require the presence of large quantities of liquid water in the humid area. 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