What is the best way to build a slab foundation on a slope?
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What is the best way to build a slab foundation on a slope?
keri gelenian
Nov. 23, 2020Last updated: Dec. 3, 2020
The grade on the building site drops 8 feet over 72 feet. Is it feasible and cost effective to build three slab foundations that step down in order to deal with the slope. The top foundation would be a for a single story 15 by 24 room. The next level would be a 24 by 24 two story structure and the garage would be at the bottom leve. I assume that this would require retaing walls from each higher slab to the one below. Thanks, Keri
There are many ways to build a slab on grade foundation on sloped building lots, but doing three separate slabs isn’t necessarily the cheapest option. Did you specifically want a 3 level house or is that something you have chosen simply to adapt to the terrain? I ask this because if its the design you want then go for it, but it may be more cost effective to adjust the lot and built a single slab. Let’s look at both options –
To build on 3 levels you will most likely need to pour the bottom slab, build a retaining wall as you suggest, or a short ICF knee wall. Then pour the next one, the next retaining wall /knee wall, and again the next slab, so it could be a long and labour intensive procedure. Each step would likely need to be poured individually, so that means 3 trips with concrete trucks and pump trucks, and that will add significantly to the cost.
8 feet over 72 feet is not too extreme, so if you weren’t married to the 3 story design, it would likely be a more simple solution to just level the lot first. You can do that by removing some of the back soil and pulling it forward and build a retaining wall at the lower section. Is that feasible? That way you do one slab with 3 side ICF wall (or partial wall). Is that making sense?
I was wondering basically the same thing. In my case, I'm in TX Hill Country, where you hit limestone at about 18 inches or less. So, digging out the high side and trying to fill the low side isn't going to work well - you'd need a jackhammer or rock cutting equipment.
在我的例子中,我认为高差大约是6英尺,横跨地基的对角线。是否有可能为此建立一个单一的水平板?这是一大片土地。土地建设者一直用3-4英尺高的墙来打地基,就像你在这张照片中看到的房子的右边:https://postimg。cc/w1X42Crf
我认为这只是一个4-6英寸的平板在沙子上,周围是混凝土墙,对吗?有什么理由不能用6英尺高的墙来帮我吗?