{"id":8858,"date":"2024-05-06T11:51:02","date_gmt":"2024-05-06T03:51:02","guid":{"rendered":"https:\/\/www.dahsin.com.tw\/?p=8270"},"modified":"2024-08-19T18:32:49","modified_gmt":"2024-08-19T10:32:49","slug":"100qa9","status":"publish","type":"post","link":"https:\/\/www.daisin.com.tw\/en\/100qa9\/","title":{"rendered":"(One Hundred Questions on Waterproofing) #9 What is birch? After handing over the mansion for sale, it is often found that the surfaces of the walls, courtyards, staircases, and flower beds have white birch growth; not only is it unsightly, but it also greatly reduces the \u201cvalue\u201d of the entire building. What is the reason for its formation? Is it related to waterproofing? Is there any special \u201cmedicine\u201d to solve this problem? Or any root-solving methods?"},"content":{"rendered":"

Answer:<\/p>\n\n\n\n

    \n
  1. The reason for the formation of birch is mainly due to the \"incomplete hydration\" of the cement mortar layer inside the decorative materials on the surface. When water seeps into the decorative materials due to the incomplete hydration of the cement mortar, free calcium is formed and carried away by the water vapor. It combines with carbon dioxide in the air and undergoes a chemical reaction to form calcium carbonate crystals, which is commonly known as the \"white birch phenomenon\".<\/strong><\/li>\n\n\n\n
  2. Because the exterior of luxury homes emphasizes its flatness and spaciousness, the cement-lime layer requires particularly high thickness and low water-lime ratio, and the surface is often sprayed with dry powder.<\/strong>(Concrete<\/strong>)All of these have created a breeding ground for the white birch.<\/strong><\/li>\n\n\n\n
  3. <\/strong> The vast majority of the white birch phenomenon is unrelated to waterproofing.<\/strong>(If it is related to waterproofing, it usually appears as white bark on the outside, and it also appears on the inside.<\/strong>)This is mainly caused by the incomplete hydration of the cement-sand mortar layer.<\/strong><\/strong><\/li>\n\n\n\n
  4. <\/strong>Most remedies or formulas in the market that claim to cure white tongue are ineffective; at best, they can only slow down the white tongue phenomenon!<\/strong><\/strong><\/li>\n\n\n\n
  5. <\/strong>Generally speaking, the calcium carbonate crystals formed by the white birch also have some function of blocking the capillaries, so after a certain point, the white birch will naturally slow down or stop growing. At that time, the surface white birch will be grinded one by one to maintain its original appearance.<\/strong>(Most luxury home developers use this method to persuade buyers.<\/strong>)\u3002<\/strong><\/strong><\/li>\n\n\n\n
  6. <\/strong>To effectively eliminate the white birch phenomenon, it is best for the site manager to have the above basic knowledge when constructing a new site. This should start by avoiding the incomplete hydration of the cement-sand mortar layer. Also, before applying the plastering compound, it is necessary to ensure that the base surface has dried completely; only then should the penetrating waterproofing material be applied. This can significantly prevent the formation of carbonate salts.<\/strong><\/strong><\/li>\n\n\n\n
  7. <\/strong>If a post-incident remedy is required, it is recommended to take a one-time-only approach\u2014removing the surface cladding and the cement-sand mortar layer, and replacing the waterproofing with a more effective solution.<\/strong><\/strong><\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

    Answer:<\/p>","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[24],"tags":[70],"class_list":["post-8858","post","type-post","status-publish","format-standard","hentry","category-100qa","tag-qa"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/posts\/8858","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/comments?post=8858"}],"version-history":[{"count":0,"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/posts\/8858\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/media?parent=8858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/categories?post=8858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.daisin.com.tw\/en\/wp-json\/wp\/v2\/tags?post=8858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}