Multifamily / Residential Plan Review: 46 Issues Found

Summary: The Site Plan (A1.1) indicates the Finished Floor Level (FFL) for Block D (Units 21-25) is +339.800. However, the Site Landscaping Plan (A1.2) shows the FFL for the same block as +342.520.

Why it matters: A discrepancy of 2.72 meters in the finished floor elevation for an entire block is a critical coordination failure. This will significantly impact earthworks, grading, retaining wall heights, building foundations, and accessibility. The difference likely stems from the sloping topography on the eastern boundary (where contour lines indicate...

Suggested next step: Please clarify the correct Finished Floor Level (FFL) for Block D (Units 21-25). Is the intended FFL +339.800 as shown on the Site Plan (A1.1), or +342.520 as shown on the Site Landscaping Plan (A1.2)?

RFI draft: Please clarify the correct Finished Floor Level (FFL) for Block D (Units 21-25). Is the intended FFL +339.800 as shown on the Site Plan (A1.1), or +342.520 as shown on the Site Landscaping Plan (A1.2)?

Summary: The structural details and legend specify '15 series masonry blockwork' for the walls. However, the architectural section for the Service Area (DQ - DR) specifies '20 SERIES CONCRETE BLOCK'.

Why it matters: A discrepancy between 15 series (140mm thick) and 20 series (190mm thick) blockwork alters the foundation footing dimensions, reinforcement layout, and internal clearance space within the service area. This must be coordinated for accurate blockwork procurement and footing pours.

Suggested next step: Please clarify the masonry block series required for the Service Area walls. The architectural section specifies 20 Series concrete block, while the structural legend and details indicate 15 Series masonry wall.

RFI draft: Please clarify the masonry block series required for the Service Area walls. The architectural section specifies 20 Series concrete block, while the structural legend and details indicate 15 Series masonry wall.

Summary: The architectural site plans designate Block D as containing Units 21-25, Block E as Units 26-30, Block F as Units 31-36, and Block G as Units 37-42. However, the structural overall foundation plan contradicts this by assigning Units 21-27 to Block D, Units 28-30 to Block E, Units 31-32 to Block F, and Units 33-42 to Block G.

Why it matters: Inconsistent block and unit designations across disciplines can lead to confusion during construction, incorrect setting out of foundations, and errors in the scheduling and procurement of materials for each building block.

Suggested next step: Please clarify the correct unit assignments for Blocks D, E, F, and G, and update either the architectural or structural drawing set to ensure consistent building block designations across all disciplines.

RFI draft: Please clarify the correct unit assignments for Blocks D, E, F, and G, and update either the architectural or structural drawing set to ensure consistent building block designations across all disciplines.

Summary: The Architectural foundation plan refers to the ground-level foundation as the '1ST LEVEL FOUNDATION' and designates the suspended slab over it as the '1ST FLOOR SLAB ABOVE'. However, the Structural drawings inconsistently label the on-grade ground foundation and slab plans as 'FIRST FLOOR FOUNDATION PLAN' and 'FIRST FLOOR SLAB PLAN' within the...

Why it matters: Inconsistent naming of levels (Ground vs. First Floor) between disciplines can lead to severe misinterpretation of the plans. Contractors might inadvertently apply slab or foundation details to the wrong physical elevation during construction, leading to critical structural or layout errors.

Suggested next step: Please standardize the floor level terminology across both Architectural and Structural drawing sets to clarify whether the on-grade slab is the 'Ground Floor' or 'First Floor', and update drawing titles accordingly to prevent on-site confusion.

RFI draft: Please standardize the floor level terminology across both Architectural and Structural drawing sets to clarify whether the on-grade slab is the 'Ground Floor' or 'First Floor', and update drawing titles accordingly to prevent on-site confusion.

Summary: The First Floor Electrical Plan specifies wall extraction ('E/W E/W') for the first-floor bathroom extractor fans in the mid-units (e.g., Units 5, 6, 7), routing the ductwork to the exterior facade. However, the Architectural First Floor & Roof Framing Plan identifies these exact same fans to be extracted through the roof ('E/R E/R').

Why it matters: The plans conflict on the extraction routing for mid-unit bathrooms. The Electrical Plan shows ducts routing to the exterior wall (E/W), while the Framing Plan shows them extracting through the roof (E/R). The design must definitively align on the extraction routing (E/R vs E/W) so ducting pathways and penetrations are properly accounted for by...

Suggested next step: Confirm whether the mid-unit bathroom extractor fans should be routed to the roof (E/R) as shown on the Framing Plan, or to the exterior wall (E/W) as shown on the Electrical Plan. Please update the plans to resolve this discrepancy.

RFI draft: Confirm whether the mid-unit bathroom extractor fans should be routed to the roof (E/R) as shown on the Framing Plan, or to the exterior wall (E/W) as shown on the Electrical Plan. Please update the plans to resolve this discrepancy.

Summary: The Foundation Plan (AS1.01) graphically indicates rebates along the perimeter edge beams using solid grey hatching (defined as 'Rebate' in the legend). However, the plan calls out details F01 and F04 for these rebated edges, which are both explicitly titled 'TYPICAL EDGE BEAM: NO REBATE' on sheet HS1.20. Furthermore, at grid A.4, the plan...

Why it matters: Applying 'NO REBATE' details to areas that require a rebate will cause critical coordination failures for exterior wall framing and cladding installation. Additionally, pouring the F04 edge beam at the plan's 400mm dimension instead of the detail's 630mm minimum will compromise structural integrity. Detail F03 (TYPICAL EDGE BEAM WITH REBATE)...

Suggested next step: Confirm if detail F03 (TYPICAL EDGE BEAM WITH REBATE) should be referenced at the perimeter edges instead of F01 and F04. Also, clarify the correct concrete width for the edge beam at grid A.4, as the plan's 400mm dimension conflicts with detail F04's 630mm minimum requirement.

RFI draft: Confirm if detail F03 (TYPICAL EDGE BEAM WITH REBATE) should be referenced at the perimeter edges instead of F01 and F04. Also, clarify the correct concrete width for the edge beam at grid A.4, as the plan's 400mm dimension conflicts with detail F04's 630mm minimum requirement.

Summary: The SLAB PLAN BLOCK E on sheet ES1.02 specifies a general vertical reinforcement of 'Vert H16 at 400 crs' for '20 Series masonry'. However, Detail F13a on sheet HS1.21, which specifically illustrates the edge beam for the block wall with schist, requires a tighter reinforcement spacing of 'H16 at 200crs Vert' for the 20 Series Block wall. The...

Why it matters: If the contractor universally applies the 400mm vertical center spacing shown on the slab plan to the 20 Series block walls supporting schist cladding, those specific walls will be under-reinforced by 50% compared to Detail F13a. This discrepancy could lead to structural insufficiency and require costly post-pour remedial doweling.

Suggested next step: Please clarify the required vertical reinforcement spacing for the 20 Series masonry walls where schist cladding is applied. Should it follow the general plan note (H16 at 400crs) on ES1.02, or the specific detail F13a (H16 at 200crs) on HS1.21?

RFI draft: Please clarify the required vertical reinforcement spacing for the 20 Series masonry walls where schist cladding is applied. Should it follow the general plan note (H16 at 400crs) on ES1.02, or the specific detail F13a (H16 at 200crs) on HS1.21?

Summary: Sheet CS1.02 (Ground Slab Plan Block C) contains section cut markers referencing detail '03 / 1.10' near Unit 20. However, detail 03 on sheet 1.10 is titled 'O & Q Section', which illustrates a structural framework for a bike shed (as indicated by the sheet title 'BIKE STORAGE SHED' and the graphical representation). This referenced building...

Why it matters: Referencing a bike shed section instead of a standard slab edge detail leaves the contractor without the necessary perimeter foundation details for Block C, potentially leading to incorrect formwork or reinforcement installation at the slab perimeter.

Suggested next step: Please clarify the intended detail for the slab perimeter near Unit 20 on Sheet CS1.02. Was the reference to detail '03 / 1.10' a drafting error, and if so, which standard edge detail should be applied for the Block C ground slab?

RFI draft: Please clarify the intended detail for the slab perimeter near Unit 20 on Sheet CS1.02. Was the reference to detail '03 / 1.10' a drafting error, and if so, which standard edge detail should be applied for the Block C ground slab?

Summary: The Post Fire Stability elevations on AS4.10 show intermediate '100x6.0 SHS' steel posts spaced at maximum intervals of 2.5m and 2.6m along Grids A.1 and A.9. However, the Foundation Plan on AS1.01 shows a conflicting column setout for these grid lines. Along Grid A.1, the foundation plan indicates a continuous '5900' mm span without...

Why it matters: If the foundation does not include thickened concrete pads and cast-in weld plates (WPX) at the locations corresponding to the fire stability frame's steel posts, the columns cannot be securely anchored as designed. This inconsistency will cause on-site delays as the foundation would require retrofitting or the structural steel frame would...

Suggested next step: Please clarify the intended column spacing for the post fire stability frames on Grids A.1 and A.9. If the 2.5m-2.6m spacing shown on AS4.10 is correct, please update the Foundation Plan (AS1.01) to include the necessary WPX cast-ins and foundation pads at these locations, and correct the conflicting 5900mm dimension.

RFI draft: Please clarify the intended column spacing for the post fire stability frames on Grids A.1 and A.9. If the 2.5m-2.6m spacing shown on AS4.10 is correct, please update the Foundation Plan (AS1.01) to include the necessary WPX cast-ins and foundation pads at these locations, and correct the...

Summary: On the Foundation Plan Block D (DS1.01), detail callout 'F11 / HS1.21' is used multiple times pointing to the internal structural ribs within the waffle slab area of UNIT 24. However, Detail F11 on HS1.21 specifies an intertenancy wall assembly featuring a '20 Series Block wall' on a '600' wide concrete footing. Internal ribs between waffle...

Why it matters: If constructed per Detail F11, the internal waffle ribs in UNIT 24 would incorrectly include massive 600mm wide concrete foundation beams and structural block walls extending through the interior living space. This contradicts the open architectural layout of a typical unit and the standard 100mm wide internal ribs used elsewhere in the waffle...

Suggested next step: Please confirm if the internal waffle ribs in UNIT 24 should reference the typical internal rib detail (such as F05 / HS1.20) rather than the intertenancy block wall detail 'F11 / HS1.21', and issue an updated foundation plan.

RFI draft: Please confirm if the internal waffle ribs in UNIT 24 should reference the typical internal rib detail (such as F05 / HS1.20) rather than the intertenancy block wall detail 'F11 / HS1.21', and issue an updated foundation plan.

Summary: The Site Landscaping Plan (A1.2) indicates that the Finished Floor Level (FFL) for Block D is +342.520 and for Block E is +342.170. However, the Overall Foundation Plan (A1.3) indicates that the FFL for Block D is +339.800 and for Block E is +339.450.

Why it matters: A discrepancy of over 2.7 meters in the FFL indicates a potential confusion between lower basement/retaining foundation levels and upper ground floor levels. Labeling two distinctly different elevations as the generic 'FFL' without clear distinction (e.g., 'Lower FFL' vs. 'Main FFL') may cause significant errors during grading, excavation, and...

Suggested next step: Please clarify the correct Finished Floor Levels (FFL) for Blocks D and E. If the buildings are split-level or feature lower foundations, please update the drawing labels to specify which level the FFL refers to (e.g., Lower FFL vs. Main FFL) to prevent setout errors.

RFI draft: Please clarify the correct Finished Floor Levels (FFL) for Blocks D and E. If the buildings are split-level or feature lower foundations, please update the drawing labels to specify which level the FFL refers to (e.g., Lower FFL vs. Main FFL) to prevent setout errors.

Summary: The First Floor Plan explicitly specifies a Finished Floor Level (FFL) of +342,230, whereas Section AA specifies a Finished Floor Level of +342,170 for the same level. This is a 60mm discrepancy.

Why it matters: A 60mm discrepancy in floor levels impacts structural framing alignments, stair riser calculations, and coordination of exterior elevations. This needs to be resolved before framing and stair fabrication begins.

Suggested next step: Please clarify the correct Finished Floor Level (FFL) for the First Floor. Is it +342,230 as shown on the Floor Plan (A.02), or +342,170 as detailed in Section AA (A.08)?

RFI draft: Please clarify the correct Finished Floor Level (FFL) for the First Floor. Is it +342,230 as shown on the Floor Plan (A.02), or +342,170 as detailed in Section AA (A.08)?

Summary: The Legend on the Ground & First Floor Plans (Page 36) explicitly designates a '15 SERIES BLOCK WALL BY ENGINEER'. Conversely, Section DD (Page 47) explicitly specifies a '20 SERIES BLOCK INTERTENANCY WALL' and '20 SERIES CONCRETE BLOCK' for these wall assemblies.

Why it matters: Using a 15 Series block (140mm nominal width) versus a 20 Series block (190mm nominal width) fundamentally impacts the structural design, wall setouts, foundations, and usable unit floor areas. Building the incorrect block size could lead to a halt in construction, structural non-compliance, or spatial coordination issues.

Suggested next step: Please confirm whether the masonry block walls for intertenancy and retaining applications should be 15 Series as indicated in the plan legend, or 20 Series as detailed in Section DD. Update the affected drawings to ensure consistent specifications.

RFI draft: Please confirm whether the masonry block walls for intertenancy and retaining applications should be 15 Series as indicated in the plan legend, or 20 Series as detailed in Section DD. Update the affected drawings to ensure consistent specifications.

Summary: The Typical Interior Stair note specifies '14 RISERS @ 194mm, TOTAL RISE OF 2710mm'. However, the actual floor-to-floor height is 2720mm, derived from the Ground Floor plan (FFL: +339,450) and First Floor plan (FFL: +342,170). The section details also confirm a total height of 2720mm (2,460mm wall height + 260mm floor thickness). Furthermore,...

Why it matters: If stairs are fabricated or framed to a 2710mm (or 2716mm) total rise, they will fall short of the 2720mm first floor landing. This discrepancy will cause installation issues on site, requiring stringer or riser adjustments to properly bridge the floor-to-floor height safely and compliantly.

Suggested next step: Please clarify the correct floor-to-floor height and provide revised stair dimensions. Should the stair risers be adjusted to accommodate the 2720mm floor-to-floor height shown on the plans and sections?

RFI draft: Please clarify the correct floor-to-floor height and provide revised stair dimensions. Should the stair risers be adjusted to accommodate the 2720mm floor-to-floor height shown on the plans and sections?

Summary: The stair notes on both the floor plan and section drawing specify a total stair rise of 2710mm, while calculating the floor-to-floor height from the section drawing dimensions yields 2720mm.

Why it matters: Calculating the actual floor-to-floor height from the section drawing dimensions (2,460mm ground floor ceiling height + 260mm upper floor framing depth) yields 2720mm. This 2720mm floor-to-floor height contradicts the 2710mm figure specified in the stair notes, creating ambiguity for framing alignment and stair fabrication.

Suggested next step: Please confirm the correct total rise and floor-to-floor height for the secondary private stairs. The stair notes specify 2710mm, but the calculated floor-to-floor height from section dimensions (2,460mm + 260mm) is 2720mm. Please update the drawings to align these dimensions for correct construction.

RFI draft: Please confirm the correct total rise and floor-to-floor height for the secondary private stairs. The stair notes specify 2710mm, but the calculated floor-to-floor height from section dimensions (2,460mm + 260mm) is 2720mm. Please update the drawings to align these dimensions for correct...