Best Gravel For Retaining Wall Base

They weigh 40 to 100 lbs.

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. The ground s a mixture of clay and degenerated rock. The stone is split at the quarry either 8 in. Similar to gravel paver base is a form of construction aggregate that contains crushed rocks such as limestone.

The wall gets its strength from a sturdy base consisting of gravel. Round rocks such as pea gravel rolls and dislodge under pressure resulting in failure of the retaining wall. I m putting in a retaining wall about 2m high and i m looking to backfill behind it with gravel to provide drainage. 150 mm plus an additional 1 in.

Design and build your retaining wall to slope at a minimum rate of. I ve three options for stone size. A level base on which the wall sits. Placed behind the retaining wall to promote drainage of water away from the wall.

A retaining wall must have the strength to hold back the weight of the soil plants and sometimes small structures behind it. 600 mm wide the length of the wall the depth of the trench will be 6 in. This is standard for all types of landscape walls. Wide and at several lengths and heights.

The leading cause of wall failure. Our trenches were more like 18 24 deep or more depending on the grade and about 18 wide. 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. Crumbly sort of stuff.

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. As with a concrete block wall build a firm gravel base and ensure good drainage. 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. Simply stack them in rows or mix heights within a row for a random look.

Due to soil erosion your retaining wall should be built on a solid foundation made from paver base. This prevents water from building up behind the wall. Choose a paver base with landscape rocks between 1 2 inch and 3 4 inch in size. Lay a 4 6 inch layer of the crushed base material in the trench.

Next compact it and level it using either a hand or mechanical compactor. You don t need mortar with a stone retaining wall. Fill the trench with a 2 to 3 inch layer of paver base. Retaining wall base trench dig a base trench 24 in.