I have poured 10 to 12 ft deep basement walls using conventional formwork by using 2 ft panels and 4ft panels sideways on top of 8 ft panels.
12 foot high concrete basement walls.
Concrete blocks are concrete masonry units or cmus but we often refer to them as concrete blocks or cinder blocks learn more about concrete masonry units a wall typically requires 1 1 8 blocks per square foot.
Backfilling with a clay soil instead of sand can increase the load by double or more while going from an 8 foot to a 10 foot wall just a 25 height increase adds 50 to the lateral pressure.
Finding how many concrete blocks you need for your project can seem like a confusing and challenging task but it can be simplified using the calculator above.
Poured concrete basement walls cost.
Each panel contains solid concrete studs for load bearing support and a built in concrete footing.
Precast foundation walls simplify basement construction save time and money and result in warmer drier basements.
Ready mix concrete costs 119 to 147 per cubic yard and an 8 inch thick basement wall measuring 12 x 8 will use 2 37 cubic yards of concrete so concrete alone costs 282 to 348 per average wall.
Soil type and backfill height both affect the lateral pressure on a basement wall.
32 inch x 12 inch footings are not uncommon for a two storey.
Horizontal spacing for 4 rebar is a minimum 2 feet within 12 inches of the top and bottom of the wall.
A walkout basement can easily be 14 feet or more up here.
Some factors that will also influence the cost of a full basement concrete foundation are.
Bar splices the concrete structure is designed to act as a single unit though parts of it are poured separately resulting in a construction joint.
Nine foot interior wall plus below grade beam for frost protection to footing is easily 14 ft.
The walls comprise high strength concrete panels manufactured off site.
An 8 inch poured concrete wall costs 12 75 per square foot or 1 224 poured on average.
Walls taller than 8 feet should be 10 inches thick.
By panels i mean regular 4 x 8 ft form plywood.
When a taller wall or a higher level of soil or both come into play the thickness should increase to 10 inches.
If you re just pouring concrete walls and don t need a foundation slab your costs might range from 2 900 to 10 350 however a large basement with thick concrete walls could easily cost upwards of 25 000.