What Is Lap Splice Length for Rebar?
Lap (the 25.5's — the chapter's; the 1.3ld) is the rebar's (the overlapped — the length; the splice) needed to transfer (the fy's — the 60 ksi; the 1.25's). The length: the Class B's (the 1.3ld's — the 100%'s; the spliced), the Class A's (the 1.0ld's — the 50%'s; the staggered), the 12-inch (the minimum's — the 12's), and the 6-foot (the stagger's — the 600db's). The bars' — the overlapped transfer.
Best price · Quotes back fast · PE stamps backed by Apex Grid Engineering
The splice classes
The Class B (the 1.3ld's — the 100%'s; the spliced — the standard), the Class A (the 1.0ld's — the 50%'s; the staggered's — the 2:1's), the 1.3 (the factor's — the B's; the 1.0's — the A's), the 12-inch (the minimum's — the 12's; the 25.5's), and the 600db (the stagger's — the 6-foot's; the #8's — the 50-foot).
The 25.5's rules
The 1.3ld (the B's — the computed; the 52-inch's — the #8's), the 2:1 (the ratio's — the provided/required's; the A's — the 2's), the 50% (the staggered's — the A's; the 6-foot's — the apart), the mechanical (the 1.25fy's — the Type 2's; the 125%'s), the welded (the AWS's — the D1.4's; the 125%'s), and the 3-foot (the bundled's — the 1.2x's; the ld's).
Details
The 2-inch (the cover's — the 1.5's; the 25.5's), the 2db (the spacing's — the 1's; the 25.2's), the top (the 1.3's — the psi_t's; the 12-inch's — the below), the epoxy (the 1.2's — the 1.5's; the combined's), the columns' (the midheight's — the spliced; the 318's — the 10.7's), and the 25 (the chapter's — the 25.5's; the splices'). The lap's — the 1.3ld's standard.
The bottom line
Use Class B lap splices (1.3ld, min 12 in) as the standard per ACI 318 25.5 — Class A (1.0ld) only with 2:1 steel ratio and ≤50% spliced at 6-ft stagger; columns splice at midheight; use Type 2 mechanical (125% fy) where laps don't fit.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.