{"id":10121,"date":"2018-06-27T00:00:29","date_gmt":"2018-06-26T23:00:29","guid":{"rendered":"https:\/\/www.propertypro.ng\/blog\/?p=10121"},"modified":"2018-06-27T08:51:50","modified_gmt":"2018-06-27T07:51:50","slug":"raft-foundation","status":"publish","type":"post","link":"https:\/\/propertypro.ng\/blog\/raft-foundation\/","title":{"rendered":"What to know about Raft foundation"},"content":{"rendered":"<p><b>Raft foundations<\/b><span style=\"font-weight: 400;\">, also known as <\/span><b>Mat Foundations<\/b><span style=\"font-weight: 400;\">, are a large concrete slab which can support a number of columns and walls. This type of foundation is described as a raft in the sense that the <\/span><b>concrete raft<\/b><span style=\"font-weight: 400;\"> is cast on the surface of the ground which supports it, as water does a raft. The slab is spread out under the entire building or at least a large part of it which lowers the contact pressure compared to the traditionally used <\/span><b>strip<\/b><span style=\"font-weight: 400;\"> or <\/span><b>trench footings<\/b><span style=\"font-weight: 400;\">. The raft foundation is cheaper and easier to install has it does not require as much excavation as the usual <\/span><b>strip foundations<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><strong><a href=\"https:\/\/www.tolet.com.ng\/property-for-sale\/lagos\/lekki\/lekki-phase-1\/\">HOUSE FOR SALE IN LEKKI PHASE 1<\/a><\/strong><\/p>\n<h2><b>Types of raft foundation <\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Solid slab raft, \u00a0also known as plain raft<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Slab beam raft<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Cellular raft<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Piled raft<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.tolet.com.ng\/property-for-rent\/lagos\/ogba\/mini-flat\"><strong>MINI FLAT FOR RENT IN OGBA<\/strong><\/a><\/p>\n<h2><b>How to construct a raft or mat foundation<\/b><\/h2>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/l3Dx6giwOyo\" width=\"300\" height=\"300\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/iframe><\/p>\n<p><span style=\"font-weight: 400;\">A raft foundation is constructed by first excavating the ground to a uniform, flat level. Then, a waterproof plastic sheet is laid over the earth, and a thin 3&#8243; layer of <\/span><b>plain cement concrete<\/b><span style=\"font-weight: 400;\"> is poured just to create a perfectly flat and level base for the foundation. After this, a waterproofing layer is installed, and then reinforcement steel for the raft slab is tied in place.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> After all the steel has been put in place, concrete is poured to the desired thickness, which is usually in the range of 200mm (8&#8243;) to 300mm (12&#8243;) thick for small buildings although this can be much thicker if heavy loads are to be carried.<\/span><\/p>\n<p><a href=\"https:\/\/www.tolet.com.ng\/property-for-rent\/delta\/asaba\/\"><strong>Houses for RENT IN Asaba<\/strong><\/a><\/p>\n<h2><b>When is Raft Foundation Used<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Rafts are most often used when the strata are unstable or because a normal strip foundation would cover more than 50% of the ground area beneath the building. They are much more commonly used in the construction of commercial buildings and domestic homes. <\/span><\/p>\n<p><a href=\"https:\/\/www.tolet.com.ng\/property-for-rent\/rivers\/port-harcourt\/mini-flat\"><strong>1 BEDROOM FLAT FOR RENT IN PORT HARCOURT<\/strong><\/a><\/p>\n<h2><b>Which circumstance is Raft foundation used?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A raft foundation is usually best under a number of circumstances listed below:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">If the walls of the building are so close that it would cause the individual footings to overlap, then raft foundations should be used<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It is used for large loads, which is why they are so common in a commercial building which tends to be much larger, and therefore heavier, than domestic homes.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The soil has a low bearing capacity so the weight of the building needs to be spread out over a large area to create a stable foundation.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The ratio of individual footings to total floor space is high. Typically if the footings would cover over half of the construction area then raft foundation would be used.<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.tolet.com.ng\/property-for-rent\/abuja\/self-contain\"><strong>SELF CONTAIN FOR RENT IN ABUJA <\/strong><\/a><\/p>\n<h2><b>Advantages of Raft Foundation<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Raft foundations tend to be cheaper and quicker to use than traditional footings<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The foundation and floor slab is combined, hence, saves time and materials<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Less excavation is required for the raft foundation<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">They are ideal for poor ground condition where normal footings would not cope well as they cannot spread the load as effectively.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Raft foundations can reduce differential settlement, where settlement occurs at different rates across the ground surface of the building, which reduces cracking and other more serious problems.<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Raft foundations, also known as Mat Foundations, are a large concrete slab which can support a number of columns and walls. This type of foundation is described as a raft in the sense that the concrete raft is cast on the surface of the ground which supports it, as water does a raft. The slab &hellip;<\/p>\n","protected":false},"author":24,"featured_media":10124,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[30,467],"tags":[2780,2781,2777,2782,2778,2776,2779],"class_list":["post-10121","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ask-us","category-real-estate-advice","tag-raft-foundation-advantages","tag-raft-foundation-construction-method","tag-raft-foundation-construction-process","tag-raft-foundation-definition","tag-raft-foundation-detail","tag-raft-foundation-diagram","tag-types-of-raft-foundation"],"_links":{"self":[{"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/posts\/10121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/comments?post=10121"}],"version-history":[{"count":5,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/posts\/10121\/revisions"}],"predecessor-version":[{"id":10282,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/posts\/10121\/revisions\/10282"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/media\/10124"}],"wp:attachment":[{"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/media?parent=10121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/categories?post=10121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/propertypro.ng\/blog\/wp-json\/wp\/v2\/tags?post=10121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}