Hendron Place Residence: 14 Issues Found
An anonymized single-family residential permit set surfaced 14 issues—including 3 critical violations affecting vapor barrier thickness, obsolete concrete standards, and incorrect live load classification—before permit submission.
Critical Issues Found
Vapor Barrier Thickness Non-Compliant: Drawing Specifies 4 mil, Code Requires Minimum 6 mil
CriticalCode Reference: 2018 International Building Code
Category: Structural
The reinforcing notes specify that slabs on grade shall be placed over '4 MIL. POLYETHYLENE VAPOR BARRIER.' Section 1907.1 of the 2018 IBC explicitly requires 'A 6-mil (0.006 inch; 0.15 mm) polyethylene vapor retarder' for concrete floor slabs supported directly on the ground. The specified 4 mil thickness is 33% thinner than the code minimum requirement of 6 mil.
Why it matters: Insufficient vapor barrier thickness may allow moisture migration through the slab, potentially causing flooring issues, moisture damage, and indoor air quality problems.
Suggested next step: Update reinforcing notes to require 6 mil minimum polyethylene vapor barrier per IBC 1907.1.
Reference to Obsolete Concrete Standard (ACI 318-95)
CriticalCode Reference: 2018 International Building Code
Category: Structural
Reinforcing Note 4 explicitly states that reinforcement details shall conform to 'ACI 318 - 95'. The 2018 IBC Section 1901.2 mandates compliance with 'ACI 318' (specifically ACI 318-14 for the 2018 code cycle). ACI 318-95 is an obsolete standard from 1995 that does not reflect current structural safety requirements.
Why it matters: Using an obsolete standard from 1995 may result in reinforcement details that don't meet current structural safety requirements, potentially compromising structural integrity.
Suggested next step: Update reinforcing notes to reference ACI 318-14 (or current edition) per 2018 IBC requirements.
Exterior Deck Live Load Incorrectly Classified as Residential Sleeping Areas - Design Live Load May Be Inadequate
CriticalCode Reference: 2018 International Building Code
Category: Structural
The floor framing notes specify 'RESIDENTIAL SLEEPING AREAS' with a live load of 30 PSF, but the construction details on this sheet clearly show this is an exterior deck structure. The details include 'DECK-TO-HOUSE LATERAL LOAD CONNECTION', 'OPEN DECKING', 'TREATED LEDGER', and 'GUARD RAILING DETAIL' - all indicating exterior deck construction, not interior sleeping areas. Per IBC Section 1607.3, live loads shall be based on 'the maximum loads expected by the intended use or occupancy.' The intended use shown in the details is an exterior deck, which typically requires higher design live loads than residential sleeping areas per IBC Table 1607.1.
Why it matters: Using 30 PSF for an exterior deck may result in under-designed structural members, potentially causing structural failure under actual deck loads (typically 40 PSF minimum for decks).
Suggested next step: Update floor framing notes to specify appropriate live load for exterior deck (typically 40 PSF minimum) per IBC Table 1607.1.
Sample High Priority Findings (9 Total)
Footing top surface shown sloped; IBC requires footing top surface level
The post foundation detail depicts the top surface at the post/footing interface with slope indicators (1:12) sloping away from the post base. IBC 1809.3 requires the top surface of footings to be level.
Stud cutting note implies 33% threshold; IMC 302.3.2 limits bearing wall cuts to 25%
Drawing framing note 14 states that studs cut or bored in excess of one-third shall be reinforced, implying a one-third (approximately 33%) baseline threshold for cuts in bearing wall studs. However, 2018 IMC Section 302.3.2 explicitly limits stud cutting in exterior walls and bearing partitions to 25% of the stud depth, with no reinforcement exception to exceed this limit.
Insufficient Siding Clearance to Grade
In the Proposed Left Elevation (View 02/04), the siding hatch pattern extends continuously down to the grade line at the front (left) portion of the wall. There is no visible separation, clearance, or transition to a masonry foundation wall indicated, appearing to show wood siding in direct contact with or in immediate proximity to the earth.
Missing Cricket at Chimney Intersection
The Proposed Rear Elevation (View 01) shows a large vertical chimney mass intersecting the sloping roof. The chimney appears significantly wider than 30 inches (wider than the adjacent windows). The roof slopes down towards the chimney on the upslope side, creating a water trap. The drawing shows a direct intersection between the roof slope and the chimney wall without indicating a cricket or saddle to divert water.
Non-compliant Handrail Graspability on Exterior Stairs
The exterior stairways shown in the elevations (specifically the Right Elevation) depict a guardrail system where the top horizontal member appears to serve as the handrail. The profile shown is a flat cap (consistent with standard deck construction, likely 2x4 or 2x6 nominal lumber), which exceeds the maximum cross-sectional dimensions for Type I handrails (2 1/4 inches max) and Type II handrails (2 3/4 inches max width above recess) as defined in Section 1014.3. There is no secondary graspable handrail visible in the drawing. Although Exception 2 to Section 1014.3 allows for 'equivalent graspability' in Group R-3 occupancies, a flat wide board does not typically provide a graspable surface equivalent to the specified types.
Perimeter footing drain note allows discharge to storm sewer, not an IPC 1111.1 approved discharge method
The cover sheet footing drainage note directs the perimeter drain tile to discharge to a storm sewer. IPC Section 1111.1 requires subsoil (foundation/footing) drains to discharge to a trapped area drain, sump, dry well, or an approved location above ground; a direct connection to a storm sewer is not one of the listed discharge methods.
Missing Required Structural Design Criteria (Snow, Wind, Seismic, Soil)
The 'ROOF FRAMING NOTES' on sheet S-2 list only live and dead loads. However, Section 1603.1 of the IBC explicitly requires that construction documents indicate additional structural design information, including ground snow load, wind design data (speed and exposure), seismic design category/site class, and soil load-bearing values. This requirement applies even to buildings using conventional light-frame construction (Section 2308). The absence of this data prevents verification of code compliance for the specific project location.
Insufficient Metal Gauge for Plumbing Protection Plates
Framing Note 13 specifies using a metal tie of "NOT LESS THAN 18 GAUGE" where plumbing pipes require cutting top plates more than 50%. However, IPC Section 305.6 requires that shield plates used to protect piping in such locations have a thickness of not less than "No. 16 gage" (0.0575 inch). 18 gauge steel (approx. 0.048 inch) is thinner than 16 gauge and does not meet the minimum code requirement for protecting pipes from physical damage (e.g., nails/screws).
Incorrect Column Header in Wood Lintel Table
The "WOOD LINTEL/HEADER TABLE" contains a column labeled "BEARING" with values (6", 8", 10", 12") that correspond exactly to the nominal depths of the wood members listed (2x6, 2x8, 2x10, 2x12). It is highly probable this is a drafting error where header depth was placed in the bearing column. If interpreted literally as bearing length, the table requires excessive bearing (e.g., 12 inches) for standard residential openings (6'-1" to 7'-0"), which differs significantly from the other lintel tables on the same sheet (specifying 5" or 8" bearing) and standard framing practice.
Issue Categories
Structural
Foundation design, structural connections, concrete standards, reinforcement, design criteria, and structural code compliance
Architectural
Building envelope, deck construction, stair compliance, handrail requirements, and architectural code compliance
Plumbing
Plumbing protection plates, footing drainage, and plumbing code compliance
Civil
Site work, drainage, and civil engineering
Code Compliance
Building code edition conflicts, code reference errors, and compliance violations
Code References
This is an anonymized example. Findings shown are excerpts for illustration. Actual project details have been modified to protect client confidentiality.
One issue found pays for the whole check