![]() The non-structural slab-on-ground on this project was probably designed per ACI 360: Design of Slabs-on-Ground. We believe the as-placed WWR is likely to be accepted by the LDP with little or no rework required. Since the WWR lap splice requirements are not available in the construction documents, it appears the inspector has mistakenly referred to Chapter 25 or the ACI 318 building code as a default to support his decision. How can we prove our installation is fit for purpose and acceptable?” Neither the structural construction documents nor the WWR shop drawings indicated lap splices. While ACI 318-19 does call for the lap length cited by the inspector, we don’t agree with his interpretation. The inspector is citing ACI 318-19, section 25.5.4, which covers plain wire WWR tension lap splices for structural slabs. ![]() The project inspector has rejected the laps, saying they must be one square plus 2 inches, or 8 inches total, minimum. ![]() We installed the WWR using a lap splice of one square overlap, or 6 inches. Reinforcing for the slab is plain welded-wire mesh (WWR 6圆). “We have a project featuring a 6-inch thick concrete slab-on-ground over an 85,000 SF footprint of prepared subgrade. Jim Klinger, Concrete Construction Specialist, The Voice Newsletter, January 2021 Safety Training & Assessment Recognition.In this case, the structural engineer must determine the embedded depth of the rebar and the appropriate product to anchor the rebar to the existing concrete. Standard splice lengths do not apply when the rebar needs to be drilled into the concrete. ![]() Once the pour is completed and the concrete has begun to harden (within a few hours of the pour), the wiring material has no further purpose. The lack of specific requirements for the wiring material or specification of the wire wrapping method may seem surprising at first, but the wire's sole purpose is to hold the rebar temporarily in place. The code requirements for the wiring material and fastening method are brief and note only that the wiring method employed should "secure" the rebar in place. Wiring Requirements for Lap Splicing Rebar Other types of splices that are code-compliant include mechanical splices and welded splices. The following are the IBC/ACI splice length requirements for the most common type of lap splice, the contact splice. All splice locations must be specified in the structural plans before approval. Therefore, either the IBC code sections governing concrete or ACI 318-14, current as of 2016, provide reliable information about lap splice code requirements.Ī structural engineer will take into account the standard requirements as well as exceptions for critical stress points, different splice length requirements when connecting rebar of different diameters, and requirements for staggering splices to prevent congestion at overlap points, which can result in inadequate concrete flow into the splice area. ACI code section 318-14, which governs rebar splicing, has been incorporated without meaningful modification into the corresponding concrete section of the 20 IBC. IBC code requirements are almost identical to the American Concrete Institute (ACI) codes. ![]() Although it's imperative to check your local code for detailed compliance requirements, most codes are based on the IBC ( International Building Code). In almost every construction situation, overlap lengths are subject to local building codes. Note, however, that overlap requirements vary with both rebar size and the specific structural application. From a structural point of view, the most critical aspect of a lap splice is the overlap length. The lap splice, as the name suggests, is created by overlapping two lengths of rebar, then wiring them together. ![]()
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