# Rebar Lapping Length

Not Reviewed
Equation / Last modified by AndrewBudd on 2018/01/19 21:02
"Rebar Lapping Length" =
Rating
Copied from
ID
KurtHeckman.Rebar Lapping Length
UUID
ba2375b0-54ff-11e7-9770-bc764e2038f2

The Rebar Lapping Length calculator computes the length overlap needed at rebar joints based on the size of the rebar (rS) and the lapping factor (LF).

INSTRUCTIONS - Enter the following:

• (rS) The size of rebar  which is used to compute the diameter for lapping considerations.
• (LF)  The lapping factor is the multiple of the diameter of the rebar to specify the lapping distance.  40 (default) and 60 are common.

Lapping Length: The calculator returns the length of rebar lap in inches.   However, this can be automatically converted into other length units (e.g. centimeters) via the pull-down menu.
Rebar Calculators:     BNT-40 Automatic Rebar Tier

• To compute the Weight of Rabar in a slab, CLICK HERE.
• To compute the Surface Area of a slab, CLICK HERE.
• To compute the Surface Area of Concrete Forms, CLICK HERE.
• To compute the Volume of Concrete in a slab, CLICK HERE.
• To compute the Weight of Concrete in a slab or wall, CLICK HERE.

### Lapping

When the dimensions of your slab or wall exceed the length of a single piece of rebar, it is required to lap the rebar and tie the bars them to create the added length.  There are a few considerations.  First, the length of the lap is often specified as 40 times the diameter of the rebar.  In this case, 40 is lapping factor.  60 is also a common factor, but the engineering specifications should always be applied.  See these YouTube videos to better understand rebar lap:

Second, the typical length of rebar is 40' and 60' in the United States.

See how much the rebar will weigh - Rebar Weight