{"id":40,"date":"2026-01-10T12:45:01","date_gmt":"2026-01-10T20:45:01","guid":{"rendered":"http:\/\/andyslandscape.ca\/blog\/?p=40"},"modified":"2026-03-05T21:03:29","modified_gmt":"2026-03-06T05:03:29","slug":"retaining-wall-drainage","status":"publish","type":"post","link":"https:\/\/andyslandscape.ca\/blog\/retaining-wall-drainage\/","title":{"rendered":"The Power of Water \u2013 Retaining Walls"},"content":{"rendered":"\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><\/figure>\n\n\n\n<p>Retaining wall drainage is the most important factor in wall stability.<\/p>\n\n\n\n<p>A retaining wall is a vertical structure that separates two areas with different heights.<br>One side holds soil. The other side is open space.<\/p>\n\n\n\n<p>No matter how tall or short it is, if it holds soil in place, it is called a retaining wall.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">The Most Important Factor: Water<\/h3>\n\n\n\n<p>The most important part of building a retaining wall is <strong>water<\/strong>.<br>More specifically, it is about <strong>controlling the flow of water<\/strong>.<\/p>\n\n\n\n<p>A retaining wall holds back soil.<br>But when water stays in the soil behind the wall, the pressure against the wall increases.<\/p>\n\n\n\n<p>Wet soil is much heavier than dry soil.<br>Depending on soil type and wall height, the pressure can be several times\u2014even many times\u2014stronger than dry soil.<\/p>\n\n\n\n<p>That is why it is very important to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduce how long water stays behind the wall<\/li>\n\n\n\n<li>Help water drain away quickly<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Common Materials for Retaining Walls<\/h3>\n\n\n\n<p>Retaining walls are usually built with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poured concrete<\/li>\n\n\n\n<li>Concrete blocks<\/li>\n\n\n\n<li>Wood<\/li>\n\n\n\n<li>Natural stone<\/li>\n<\/ul>\n\n\n\n<p>All of these must be built with proper drainage in mind.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">A Common Mistake<\/h3>\n\n\n\n<p>Some people think that adding more concrete will make the wall stronger.<\/p>\n\n\n\n<p>They:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pour a thick concrete base under the wall<\/li>\n\n\n\n<li>Fill the inside of blocks with concrete<\/li>\n\n\n\n<li>Use mortar between blocks<\/li>\n\n\n\n<li>Sometimes even coat the back of the wall with mortar<\/li>\n<\/ul>\n\n\n\n<p>It looks very strong.<\/p>\n\n\n\n<p>But the wall still collapses.<\/p>\n\n\n\n<p>Why?<br>Because they ignored the power of water.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Example: Concrete Blocks<\/h3>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-id=\"53\" src=\"https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-1-768x1024.jpeg\" alt=\"\" class=\"wp-image-53\" srcset=\"https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-1-768x1024.jpeg 768w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-1-225x300.jpeg 225w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-1-1152x1536.jpeg 1152w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-1.jpeg 1536w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"55\" src=\"https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-2-1024x768.jpg\" alt=\"\" class=\"wp-image-55\" srcset=\"https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-2-1024x768.jpg 1024w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-2-300x225.jpg 300w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-2-768x576.jpg 768w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-2-1536x1152.jpg 1536w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/retaining-wall-with-Geogrid-reinforcement-2.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n\n\n<p>Pre-made concrete blocks sold in stores usually have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A hollow center<\/li>\n\n\n\n<li>One finished face (the other side will be buried in soil)<\/li>\n<\/ul>\n\n\n\n<p>Many people think filling the hollow center with concrete makes the wall stronger.<\/p>\n\n\n\n<p>But filling it with <strong>gravel<\/strong> actually makes it stronger.<\/p>\n\n\n\n<p>Why?<br>Because the wall itself becomes part of the drainage system.<\/p>\n\n\n\n<p>Manufacturer instructions clearly say:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compact a gravel base under the wall<\/li>\n\n\n\n<li>Install drainage backfill (gravel) behind the wall<\/li>\n\n\n\n<li>Sometimes add a drain pipe to help water flow away faster<\/li>\n<\/ul>\n\n\n\n<p>If heavy structures or vehicles will be above the wall:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The gravel layer must be thicker<\/li>\n\n\n\n<li>A grid-style reinforcement mesh may be added<\/li>\n<\/ul>\n\n\n\n<p>This mesh helps hold the soil together and spreads the pressure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Wooden Retaining Walls<\/h3>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"56\" src=\"https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/wooden-retaining-wall-with-Reinforcement-bar-1024x576.jpg\" alt=\"\" class=\"wp-image-56\" srcset=\"https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/wooden-retaining-wall-with-Reinforcement-bar-1024x576.jpg 1024w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/wooden-retaining-wall-with-Reinforcement-bar-300x169.jpg 300w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/wooden-retaining-wall-with-Reinforcement-bar-768x432.jpg 768w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/wooden-retaining-wall-with-Reinforcement-bar-1536x864.jpg 1536w, https:\/\/andyslandscape.ca\/blog\/wp-content\/uploads\/2026\/03\/wooden-retaining-wall-with-Reinforcement-bar-2048x1152.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Wooden retaining wall &amp; Reinforcement bar<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<p>With wood walls, gravel drainage is still important.<br>But reinforcement bars (rebar) or deep support posts are also critical.<\/p>\n\n\n\n<p>These posts are driven deep into the ground.<br>They resist the pushing force of the soil.<\/p>\n\n\n\n<p>Simply stacking wood nicely does not create strength.<br>Even strong nails alone are not enough.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Why This Matters<\/h3>\n\n\n\n<p>Retaining wall work is one of the most expensive parts of garden construction.<\/p>\n\n\n\n<p>Because of the cost, some homeowners decide to try DIY after getting several quotes.<\/p>\n\n\n\n<p>But without understanding the power of water, walls often fail sooner than expected.<\/p>\n\n\n\n<p>Even some inexperienced contractors skip:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Proper drainage layers<\/li>\n\n\n\n<li>Reinforcement installation<\/li>\n<\/ul>\n\n\n\n<p>This leads to collapse.<\/p>\n\n\n\n<p>That is why:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You must understand the construction method<\/li>\n\n\n\n<li>Always follow manufacturer guidelines<\/li>\n\n\n\n<li>Choose your contractor carefully<\/li>\n<\/ul>\n\n\n\n<p>Water may look harmless, but in retaining walls, it is the most powerful force of all.<\/p>\n\n\n\n<p class=\"has-text-align-right\">Written by Andy Lee<br>Owner of Andy&#8217;s Landscape Inc. \u2013 Landscape Contractor in Maple Ridge, BC<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Retaining wall drainage is the most important factor in wall stability. A retaining wall is a vertical structure that separates two areas with different heights.One side holds soil. The other side is open space. No matter how tall or short it is, if it holds soil in place, it is called a retaining wall. The [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-40","post","type-post","status-publish","format-standard","hentry","category-garden-design-idea"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>retaining-wall-drainage<\/title>\n<meta name=\"description\" content=\"Understand how water pressure affects retaining walls. 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