# How far should anchor be from edge of concrete?

## How far should anchor be from edge of concrete?

Rule: Mechanical type anchors should not be set a minimum of 5 anchor diameters from an unsupported edge. Explanation: If set too close to an unsupported edge, the outward pressure of the concrete anchor will decrease the holding value of the anchor or make it non-existent.

How far should anchor bolts stick out?

If you are using anchor bolts for concrete slabs or foundations it’s important to place the bolt in the concrete so it’s in the center of the wall. For 2 x 6 walls, the bolt would be 2 3/4 inches from the outer edge and for 2 x 4 walls the anchor bolt would be 1 3/4 inches from the edge.

### What is the minimum spacing distance for fasteners fixed to concrete?

A rule-of-thumb in the concrete-fastener industry is that the minimum spacing should be 10 diameters from each anchor, and measured center to center. The spacing from an unsupported edge should be at least five-anchor diameters.

What is critical edge distance?

The critical edge distance (cac) is defined as the critical distance required to develop the basic strength as controlled by concrete breakout or bond of a post-installed anchor.

#### What is the rule of thumb for distance from an unsupported edge?

The rule of thumb is a minimum of five anchor diameters from the unsupported edge of the concrete. For example, if your wedge anchor is 1/2″ in diameter, it must be installed a minimum of 2 1/2″ from the unsupported edge.

Why is edge distance important?

If the joint is critical in bearing, it would suggest a greater edge distance. In the above example, the joint is critical in shear because the shearing strength that the rivet can withstand is less than the bearing strength that the sheet material can withstand.

## How much should a bolt protrude?

Threaded fasteners, when installed and tightened, should protrude a distance of at least one thread beyond the top of the nut or plastic insert. Excessive protrusion should be avoided, particularly when necessary clearances, accessibility, and safety are important.

What is minimum edge distance anchors?

From a practical point of view, the clear distance for anchor bolts or anchor bolt sleeves to the edge of the concrete shall be a minimum of 100 mm. This clear distance is intended to prevent corrosion and to make sure that the anchor bolts are not in contact with the rebar cage.

### How long do concrete anchors need to be?

As a rule of thumb, the space for the nut and washer is equal to the diameter of the wedge anchor being used. For example, if a 2×4 is being fastened to concrete with a 1/2” wedge anchor then the minimum length of wedge anchor would be 1-1/2”(2×4) + 2-1/4”(minimum embedment) + 1/2”(space for nut and washer) = 4-1/4”.

What is the minimum edge distance?

Minimum edge distance (distance between centre of the bolt hole to the plate edge) shall not be less than 1.25 times the nominal bolt diameter. The value is recommended in Clause 9.5. 2 for rolled edges and can be modified in Code setup.