Plan Review: 307 Issues Found

Summary: The elevations identify base cabinet 154c as the designated cabinet for the accessible sink and drinking fountain (Key Note F18). However, the cabinetry schedule explicitly states that cabinet 154C has a 'DOOR KEY LOCKED', and a general note further requires all cabinetry doors to be key locked. Providing a closed, locked door beneath the sink completely obstructs the open space required for a ...

Why it matters: Without an open, unobstructed space for knee and toe clearance, individuals in wheelchairs cannot pull up to properly use the sink or drinking fountain. This directly violates the clear floor space requirements of the building code and will result in a failure during accessibility inspections.

Suggested next step: Please confirm if the doors on cabinet 154C should be removed, made retractable, or omitted entirely to provide the required unobstructed knee and toe clearance complying with ADA Sections 602.2 and 606.2.

RFI draft: Please confirm if the doors on cabinet 154C should be removed, made retractable, or omitted entirely to provide the required unobstructed knee and toe clearance complying with ADA Sections 602.2 and 606.2.

Summary: Detail 5 specifies a suspended ceiling trapeze composed of two 162T125-33 tracks placed back-to-back, forming a built-up flexural member. The detail dictates fastening them with "#8X 1/2\" L SELF DRILLING SMS @ 12\" O.C. & 3\" FROM EACH END IN CENTER OF WEB." However, AISI S100-16 Section I1.1 dictates that the maximum spacing of connections for back-to-back C-sections must be limited by equati...

Why it matters: Without two vertically spaced rows of fasteners, the individual track sections can twist independently when subjected to the concentrated load from the suspended ceiling hanger wire. This compromises the composite strength of the trapeze and could lead to structural failure, dropping the ceiling ...

Suggested next step: Please revise Detail 5 to specify two rows of fasteners (one near the top flange and one near the bottom flange) with an appropriate vertical spacing distance to satisfy AISI S100-16 Section I1.1, or utilize a single dedicated structural member with sufficient capacity.

RFI draft: Please revise Detail 5 to specify two rows of fasteners (one near the top flange and one near the bottom flange) with an appropriate vertical spacing distance to satisfy AISI S100-16 Section I1.1, or utilize a single dedicated structural member wi...

Summary: The Concealed Duct Support Detail specifies a maximum hanger/strap load of 160 lbs. Key Note 2 specifies that hangers attaching to light gauge framing (identified in Key Note 1 as 33-mil '600S162-33' blocking) are to be secured with a single '#10x1" S/M SCREW'. The leftmost detail shows this fastener installed vertically into the bottom flange of the blocking, loading the screw in pure tension....

Why it matters: If the single #10 screw is loaded to the maximum 160 lb hanger load permitted by the general notes, it is likely to strip or pull out of the thin-gauge steel blocking. This creates an immediate risk of the hanger failing and the ductwork detaching or falling during or after construction. The conn...

Suggested next step: The single #10 sheet metal screw specified in Key Note 2 for light gauge framing provides insufficient pull-out capacity to support the 160 lb maximum hanger load stated in General Note 4. Please provide a revised detail utilizing multiple fasteners or a different hanger clip ...

RFI draft: The single #10 sheet metal screw specified in Key Note 2 for light gauge framing provides insufficient pull-out capacity to support the 160 lb maximum hanger load stated in General Note 4. Please provide a revised detail utilizing multiple fastene...

Summary: Detail 9/AD.4 provides a single, uniform fastening layout (12-inch and 24-inch spacing) for the roof insulation and cover board across the entire roof. ASCE 7 Chapter 30 explicitly requires the roof to be designed for varying wind pressures, specifically mandating higher design wind pressures for 'edge or corner zones' compared to the field of the roof. The provided details fail to demarcate th...

Why it matters: Insufficient fastening in the roof's edge and corner zones is a primary cause of catastrophic roof blow-offs during high wind events. Without identifying these zones and specifying the enhanced fastening density, the contractor will likely install the uniform pattern everywhere, failing to meet t...

Suggested next step: Please provide a roof plan that clearly delineates the ASCE 7 wind zones (Field, Edge, Corner) and update the insulation attachment details to specify the enhanced fastener spacing and density required for the edge and corner zones.

RFI draft: Please provide a roof plan that clearly delineates the ASCE 7 wind zones (Field, Edge, Corner) and update the insulation attachment details to specify the enhanced fastener spacing and density required for the edge and corner zones.

Summary: Detail 6 specifies a '1-1/2"x1-1/2"x1/8" ANGLE LATERAL BRACE' attached at a 45-degree angle. The drawing shows the lower end of this brace connecting to a bracket mounted directly on the vertical '3/8"ø THREADED ROD', just above the isolator. Under seismic loading, this lateral brace will push and pull on the vertical threaded rod, subjecting it to severe bending forces.

Why it matters: ASCE 7 C13.6.6 explicitly dictates that connection details prone to brittle failures, specifically hanger rods subject to large amplitude cycles of bending stress, should be avoided. Threaded rods are highly vulnerable to fatigue and brittle fracture when bent. A failure of the rod would result in ...

Suggested next step: Relocate the lateral brace connection away from the threaded hanger rod. Consider bracing directly to a structural framework or the fan casing (with adequate internal support) so the hanger rod is loaded only in tension.

RFI draft: Relocate the lateral brace connection away from the threaded hanger rod. Consider bracing directly to a structural framework or the fan casing (with adequate internal support) so the hanger rod is loaded only in tension.

Summary: In Detail 6, the '1-1/2"x1-1/2"x1/8" ANGLE LATERAL BRACE' is attached to the threaded rod above the spring isolator. The fan hangs from the bracket below the isolator without any specified seismic snubbers or lateral limit stops to restrain its mass.

Why it matters: ASCE 7 C13.4 mandates that 'positive restraint must be provided for each component' to prevent uncontrollable rocking or sliding. By bracing only the rod above the isolator, the suspended fan mass itself remains unbraced and can swing uncontrollably during an earthquake, risking catastrophic dama...

Suggested next step: Provide seismic snubbers or an approved lateral bracing method that actively limits the lateral movement of the isolated fan mass itself during seismic events.

RFI draft: Provide seismic snubbers or an approved lateral bracing method that actively limits the lateral movement of the isolated fan mass itself during seismic events.

Summary: Multiple exterior wall details explicitly specify the installation of "2-LAYERS OF VAPOR BARRIER" on the exterior side of the wall framing (directly behind the exterior plaster/sheathing). The building code requires a "water-resistive barrier" in this location to prevent liquid water accumulation while allowing the wall cavity to breathe. Additionally, the code dictates that vapor retarders sha...

Why it matters: Installing a true vapor barrier (Class I vapor retarder) on the exterior of a wall assembly will trap condensation within the stud cavity, leading to moisture accumulation, mold growth, and structural rot. Using the correct terminology is critical to ensure the contractor installs a vapor-permeab...

Suggested next step: Please clarify the intended material for the exterior plaster underlayment. Update all references calling for a "VAPOR BARRIER" or "VAPOR RETARDER" on the exterior side of the wall to specify an approved "WATER-RESISTIVE BARRIER" in compliance with CBC Sections 1402.2, 1403.2,...

RFI draft: Please clarify the intended material for the exterior plaster underlayment. Update all references calling for a "VAPOR BARRIER" or "VAPOR RETARDER" on the exterior side of the wall to specify an approved "WATER-RESISTIVE BARRIER" in compliance wit...

Summary: Details 6 and 7 explicitly instruct to "LAP SHEET METAL FLASHING OVER VAPOR BARRIER" at the roof-to-wall intersections. This creates a reverse lap where the wall's water-resistive barrier is tucked behind the roof flashing. Code Section 2512.1.2 requires that "The water-resistive barrier shall lap the attachment flange" of the weep screed, and Section 1503.2 requires flashing to be installed to...

Why it matters: A reverse lap at a primary roof-to-wall intersection completely compromises the building envelope's weather protection. If installed as drawn, water running down the weather barrier behind the stucco will be funneled into the structure, leading to rapid structural rot, mold proliferation, and dam...

Suggested next step: Please revise Details 6 and 7 to explicitly state that the two layers of the wall vapor barrier (water-resistive barrier) must lap OVER the vertical leg of the sheet metal flashing and weep screed attachment flange in a shingle fashion to ensure positive drainage to the exterior.

RFI draft: Please revise Details 6 and 7 to explicitly state that the two layers of the wall vapor barrier (water-resistive barrier) must lap OVER the vertical leg of the sheet metal flashing and weep screed attachment flange in a shingle fashion to ensure p...

Summary: Detail 3 specifies 3/4" long truss head wood screws for fastening 5/8" drywall to the framing. Using a 3/4" long screw for 5/8" thick drywall provides only 1/8" of embedment into the wood framing. This directly violates CBC Table 2508.6, which requires a minimum 1 1/4-inch long screw (as a substitute for a 1 5/8-inch nail) for thinner 1/2" gypsum board ceiling assemblies.

Why it matters: With only 1/8" of embedment, the ceiling drywall will safely support no weight and will detach and fall, posing a severe overhead safety hazard. The installation will immediately fail building inspections, leading to mandatory rework.

Suggested next step: Please revise the fastener specification in the Roof Hatch detail to require a minimum 1 5/8" wood screw for the 5/8" drywall attachment, ensuring adequate penetration into the wood framing per CBC Table 2508.6.

RFI draft: Please revise the fastener specification in the Roof Hatch detail to require a minimum 1 5/8" wood screw for the 5/8" drywall attachment, ensuring adequate penetration into the wood framing per CBC Table 2508.6.

Summary: The drawing specifies a 'CMU TO BAR' minimum clearance of 1/2-inch. However, CBC Section 2104.2.2 requires that the clear distance between masonry unit surfaces and reinforcement be a minimum of one bar diameter. The drawing explicitly details bar laps for sizes up to #9. For any bar size larger than #4 (which has a 1/2-inch diameter), the 1/2-inch minimum clearance shown on the drawing is less...

Why it matters: Inadequate clearance around large-diameter reinforcement prevents proper grout consolidation and flow, compromising the bond between the masonry, grout, and steel. This will reduce the structural capacity of the wall and result in failed special inspections during construction.

Suggested next step: Please revise the 'CMU TO BAR' minimum clearance note to state '1/2-inch or one bar diameter, whichever is greater' to comply with CBC Section 2104.2.2.

RFI draft: Please revise the 'CMU TO BAR' minimum clearance note to state '1/2-inch or one bar diameter, whichever is greater' to comply with CBC Section 2104.2.2.

Summary: Key Note 3 on the exterior elevations specifies installing exterior stucco over '2 LAYERS OF VAPOR BARRIER'. This violates the materials and methods requirements of the California Building Code referenced in Section 702.7. The CBC requires a vapor-permeable water-resistive barrier (WRB), such as two layers of Grade D paper or equivalent, behind exterior stucco. A vapor barrier is non-permeable ...

Why it matters: Installing a vapor barrier on the exterior side of the wall assembly will trap moisture within the wall cavity. This prevents the wall from drying to the exterior, inevitably leading to severe condensation, mold growth, and structural rot in the framing. Furthermore, the note specifies 'ELASTOMER...

Suggested next step: Please clarify if 'VAPOR BARRIER' in Key Note 3 is a typo for 'water-resistive barrier' (WRB). Revise the drawing to specify a CBC-compliant vapor-permeable WRB (e.g., two layers of Grade D building paper or equivalent) behind the exterior stucco to allow the wall assembly to ...

RFI draft: Please clarify if 'VAPOR BARRIER' in Key Note 3 is a typo for 'water-resistive barrier' (WRB). Revise the drawing to specify a CBC-compliant vapor-permeable WRB (e.g., two layers of Grade D building paper or equivalent) behind the exterior stucco ...

Summary: Detail 1 universally requires "1/2" PIPE INSULATION AT NON-RESIDENTIAL UNITS" for refrigerant piping. However, the drawings indicate the use of heat pump systems (evidenced by the "O/B" terminal for the Roof Top Unit in Detail 2 and the "Anti-cold air" operation for the Fan Coil Unit in Detail 5). Refrigerant lines in space heating mode operate at elevated temperatures (typically well above 105...

Why it matters: Undersized insulation on heating refrigerant lines causes severe thermal energy losses and will definitively fail prescriptive energy code inspections. If installed as drawn, it will result in costly tear-outs and replacement of installed insulation prior to occupancy.

Suggested next step: Revise the general notes in Detail 1 to specify refrigerant pipe insulation thickness in accordance with CEC Table 120.3-A based on actual fluid temperatures. Specifically, require at least 1.0" or 1.5" thick insulation for refrigerant lines serving heat pump systems.

RFI draft: Revise the general notes in Detail 1 to specify refrigerant pipe insulation thickness in accordance with CEC Table 120.3-A based on actual fluid temperatures. Specifically, require at least 1.0" or 1.5" thick insulation for refrigerant lines servi...

Summary: The mechanical notes calculate combustion air for gas appliances in Equipment Room #404 using a ratio of 1 square inch per 4,000 BTUH, specifying two 12"x6" louvers for a total 155,000 BTUH load. Keynote 2A explicitly places these louvers "WITHIN DOOR", taking air from an adjacent indoor space. Under CMC 701.5(1), indoor combustion air openings on the same story must provide at least 1 square i...

Why it matters: Inadequate combustion air limits the oxygen available to the 100,000 BTUH furnace and 55,000 BTUH water heater, which can result in incomplete combustion, appliance malfunction, and a serious carbon monoxide hazard. This will also fail mechanical permitting and inspections.

Suggested next step: Please revise the combustion air calculation to comply with the indoor opening requirements of CMC 701.5(1) (1 sq. in. per 1,000 BTUH, with a minimum of 100 sq. in. per opening) and increase the size of the louvers in the door to Equipment Room 404 accordingly.

RFI draft: Please revise the combustion air calculation to comply with the indoor opening requirements of CMC 701.5(1) (1 sq. in. per 1,000 BTUH, with a minimum of 100 sq. in. per opening) and increase the size of the louvers in the door to Equipment Room 40...

Summary: The Fan Coil / Heat Pump Unit Schedule keynote 2 requires the contractor to 'PROVIDE W/ CONDENSATE PUMP' and 'INSULATE AND PROVIDE PVC SOCKET IN ELECTRICAL ROOM'. This routes the condensate discharge connection into an electrical room, which does not constitute an 'approved location' for water disposal.

Why it matters: Section 1105.7 of the Mechanical Code mandates that condensate be collected and drained to an approved location. Discharging or providing open condensate plumbing connections within an electrical room poses a severe hazard to electrical equipment (shock/fire risks) and will result in a failed ins...

Suggested next step: Submit an RFI to reroute the condensate line from the fan coil unit to an approved sanitary or storm drain location outside of the electrical room.

RFI draft: Submit an RFI to reroute the condensate line from the fan coil unit to an approved sanitary or storm drain location outside of the electrical room.

Summary: Detail 1 indicates that the gas supply piping is routed to the unit via a knock-out directly through the equipment curb. Detail 2 illustrates that the interior of this unit curb functions as the supply and return air compartments. Routing gas piping through the unit curb places it inside the building's air duct/plenum, which directly violates code restrictions prohibiting gas piping from being ...

Why it matters: Installing gas piping inside a supply or return air duct creates a severe life-safety and fire hazard. If a gas leak were to occur in the section of piping located within the curb, flammable gas would be introduced directly into the building's occupied spaces through the air stream. The gas pipe ...

Suggested next step: Relocate the gas roof penetration outside of the unit curb utilizing an approved roof jack or pitch pocket, and route the gas piping above the roof to the unit connection. If the curb features a separate, fully sealed and gastight utility chase isolated from the air stream, pl...

RFI draft: Relocate the gas roof penetration outside of the unit curb utilizing an approved roof jack or pitch pocket, and route the gas piping above the roof to the unit connection. If the curb features a separate, fully sealed and gastight utility chase is...