Best Gravel For Retaining Wall Base

Retaining wall base trench dig a base trench 24 in.

Best gravel for retaining wall base.

For lower walls 2 we put 1 minimum of gravel 6 of sand then reinforced concrete base or concrete block below grade. Design and build your retaining wall to slope at a minimum rate of. Choose a paver base with landscape rocks between 1 2 inch and 3 4 inch in size. Similar to gravel paver base is a form of construction aggregate that contains crushed rocks such as limestone.

25 mm for each 1 ft 300 mm of wall height for the amount or buried block that is needed. Simply stack them in rows or mix heights within a row for a random look. A wall that leans into the soil it retains is less likely to be pushed outward by soil pressure than a plain old vertical wall. I m putting in a retaining wall about 2m high and i m looking to backfill behind it with gravel to provide drainage.

Next compact it and level it using either a hand or mechanical compactor. A handheld tamping tool can really help in getting the gravel level but you re right one stray stone can throw off the entire operation. 6 10mm 20 25mm and 40 50mm. 600 mm wide the length of the wall the depth of the trench will be 6 in.

Our trenches were more like 18 24 deep or more depending on the grade and about 18 wide. This is standard for all types of landscape walls. As with a concrete block wall build a firm gravel base and ensure good drainage. You don t need mortar with a stone retaining wall.

I ve three options for stone size. Round rocks such as pea gravel rolls and dislodge under pressure resulting in failure of the retaining wall. Due to soil erosion your retaining wall should be built on a solid foundation made from paver base. Placed behind the retaining wall to promote drainage of water away from the wall.

The stone is split at the quarry either 8 in. Crumbly sort of stuff. The ground s a mixture of clay and degenerated rock. The wall gets its strength from a sturdy base consisting of gravel.

150 mm plus an additional 1 in. The leading cause of wall failure. A retaining wall must have the strength to hold back the weight of the soil plants and sometimes small structures behind it. Lay a 4 6 inch layer of the crushed base material in the trench.

They weigh 40 to 100 lbs. A level base on which the wall sits. I ve got a little problem outside my area of expertise. To keep the blocks on your retaining wall level and structurally sound you need a base layer of several inches of well compacted sharp gravel.