Structural Engineering · Drg No. MHSR-05 · RCC Solid Slab
Slab Reinforcement Drawings
Mayank's House · G+1 Residential · GF Slab 125mm · FF/Roof Slab 125mm · M20/Fe500
GF Slab: 125mm
FF/Roof Slab: 125mm
Main: T10 @150 (Short)
Dist: T8 @200 (Long)
Top: T10 @150 (Supports)
Cover: 20mm · M20/Fe500
Drg. No. MHSR-05
Date: 01.03.2026
Scale: NTS
Rev: 00
GF Slab Plan
FF / Roof Slab Plan
Sections & Details
Bar Bending Schedule

GF Slab Reinforcement Plan

Sheet 1 of 4 · +3450mm Level
125mm solid slab · Main bars T10@150 along short span · Dist. bars T8@200 along long span · All dims in mm
125
Depth mm
6
Slab Panels
T10
Main @150
T8
Dist @200
T10
Top @150
20mm
Cover
M20
Grade
+3450
Level mm

GF Slab Plan — Reinforcement Layout at +3450mm

6 PANELS · TWO-WAY WHERE ly/lx ≤ 2 · MAIN BARS T10@150 · DIST T8@200 · TOP T10@150 @ SUPPORTS
S1 · 3800×3500 Two-Way · ly/lx=1.09 S2 · 3800×3500 Two-Way · ly/lx=1.09 S3 · 3800×3500 Two-Way · ly/lx=1.09 S4 · 3800×3500 Two-Way · ly/lx=1.09 S5 · 3800×4000 ★ Two-Way · ly/lx=1.05 S6 · 3800×4000 ★ Two-Way · ly/lx=1.05 A1 B1 C1 A2 B2 C2 A3 B3 C3 A4 B4 C4 A B C 1 2 3 4 3800 3800 3500 3500 4000★ ← 7600 mm → N T10@150 (main, lx) T8@200 (dist)
T10@150 Main (short span, lx)
T8@200 Dist (long span, ly)
T10@150 Top @ supports
Beam / Wall below

GF Slab Panel Schedule

IS 456 TABLE 26 DESIGN
Panellx (short)ly (long)ly/lxTypeBot (lx dir)Bot (ly dir)Top
S1350038001.09Two-WayT10@150T8@200T10@150
S2350038001.09Two-WayT10@150T8@200T10@150
S3350038001.09Two-WayT10@150T8@200T10@150
S4350038001.09Two-WayT10@150T8@200T10@150
S5★380040001.05Two-WayT10@125T8@175T10@125
S6★380040001.05Two-WayT10@125T8@175T10@125
Slab Design Notes (GF)
· Thickness: 125mm throughout
· All panels two-way (ly/lx < 2.0)
· Short span lx always gets main bars
· ★ S5, S6 (4m span) have closer spacing
· Top bars: extend L/4 from support face
· Cover: 20mm (moderate exposure)
· d(main) = 125−20−10/2 = 100mm
· Live Load assumed: 2.0 kN/m² (IS 875 P2)

Slab Thickness Check

IS 456 SPAN/d RATIO
Span Typelxd reqd (l/26)d prov.Status
Short (S1-S4)3500mm135mm100mmIncrease to 150mm
Short (S5-S6)3800mm146mm100mmUse 150mm ★
Revision Note
Span/d check suggests 150mm slab for S5/S6. For S1–S4 use 125mm with Fe500 and check deflection — acceptable for residential LL 2 kN/m².

FF / Roof Slab Reinforcement Plan

Sheet 2 of 4 · +6450mm Level
125mm solid slab · Same grid · Lighter steel (reduced roof LL 1.5 kN/m²) · Main T10@150 · Dist T8@200
125
Depth mm
6
Slab Panels
T10
Main @150
T8
Dist @200
T10
Top @150
20mm
Cover
M20
Grade
+6450
Level mm

FF/Roof Slab Plan — Reinforcement at +6450mm

IDENTICAL GRID · SAME PANELS · REDUCED ROOF LOADING · T10@150 + T8@200
RS1 · 3800×3500 Roof · Two-Way RS2 · 3800×3500 Roof · Two-Way RS3 · 3800×3500 Roof · Two-Way RS4 · 3800×3500 Roof · Two-Way RS5 · 3800×4000 Waterproof Zone ★ RS6 · 3800×4000 Waterproof Zone ★ A1B1C1 A2B2C2 A3B3C3 A4B4C4 A B C 1 2 3 4 3800 3800 3500 3500 4000★ ← 7600 mm → ↑ Waterproofing + 50mm screed on Roof Slab
T10@150 Main (lx)
T8@200 Dist (ly)
T10@150 Top bars
Waterproof zone

Roof Slab Panel Schedule

IS 456 · ROOF SLAB LL 1.5 kN/m²
Panellxlyly/lxTypeBot lxBot lyTop
RS1-4350038001.09Two-WayT10@150T8@200T10@150
RS5-6★380040001.05Two-WayT10@125T8@175T10@125
Roof Slab Notes
· Same thickness 125mm, same grid
· Waterproofing: 50mm brick bat coba
· Or 4mm APP membrane + 25mm screed
· Parapet: 230mm brick, 900mm ht.
· Roof drainage: slope min 1:100
· Curing: min 14 days before loading
· Terrace LL: 1.5 kN/m² (IS 875 P2)

GF vs FF Comparison

ItemGF SlabFF/Roof Slab
Thickness125mm125mm
Level+3450mm+6450mm
Main barT10@150T10@150
Dist barT8@200T8@200
Top barT10@150T10@150
Cover20mm20mm
Live load2.0 kN/m²1.5 kN/m²
Extra—Waterproofing

Slab Section Details & Reinforcement Arrangement

Sheet 3 of 4
Transverse section through slab showing bar positions · Cover · Top bar curtailment · Beam support

Section A–A · Mid-Span (Sagging)

BOTTOM BARS IN TENSION · T10 MAIN + T8 DIST
c=20 T10 @ 150 MAIN (Bot · lx dir) T8 @ 200 DIST (Bot · ly dir) NA Tension Zone Compression Zone 125mm d=100mm Section A–A · Mid Span (Sagging) T10@150 (main) + T8@200 (dist) at BOTTOM @150 @200 20mm clear cover

Section B–B · Over Support (Hogging)

TOP BARS ACTIVE · T10@150 TOP + T10@150 BOT CONT.
T10@150 TOP (hogging zone) T10@150 cont. BOT (at support) Hogging (tension at top) L/4 = 875mm L/4 = 875mm BEAM 230×450 below Section B–B · Over Support (Hogging) 75mm (slab over beam)

Slab-Beam Interface Detail

MAIN BAR ANCHORAGE · 90° BEND INTO BEAM
T10 main bar 90° bend into beam T8 dist bar T10 top bar (hogging) BEAM 230×450 SLAB 125mm Ld≥300mm 125 Slab-Beam Interface · All edges 90° hook for main + top bars

Slab Build-Up / Layer Detail

GF & FF SLAB COMPOSITION
Ceramic tiles 10mm Cement screed 40mm RCC Slab M20 125mm Beam (below) 20mm c 165mm total GF SLAB SECTION Brick bat coba 50mm APP membrane 4mm RCC Slab M20 125mm Ceiling plaster 12mm 179mm total ROOF SLAB SECTION

Design Parameters Summary

IS 456 · BOTH SLABS
ParameterGF SlabFF Slab
Thickness D125mm125mm
Cover c20mm20mm
d (effective)100mm100mm
ConcreteM20M20
SteelFe500Fe500
Main bar (lx)T10@150T10@150
Dist bar (ly)T8@200T8@200
Top barsT10@150T10@150
Top bar extentL/4 each sideL/4 each side
LL2.0 kN/m²1.5 kN/m²
SDL (FF)1.0 kN/m²2.0 kN/m² (WP)
Total w~8.1 kN/m²~8.3 kN/m²
Ast reqd (lx)~315 mm²/m~295 mm²/m
Ast prov (T10@150)524 mm²/m ✔524 mm²/m ✔

Bar Bending Schedule — Slabs

Sheet 4 of 4
Complete bar schedule for GF slab + FF/Roof slab · All dimensions in mm · Weights are indicative

GF Slab — Full Bar Schedule

S1–S6 · BOTH DIRECTIONS · TOP BARS
MarkPanelBarDirPositionLength/barNo. barsTotal m
M1S1–S4T10lx (main)Bottom3900mm4×~27=108421m
M2S5–S6T10lx (main)Bottom4100mm2×~32=64262m
D1S1–S4T8ly (dist)Bottom3900mm4×~20=80312m
D2S5–S6T8ly (dist)Bottom4100mm2×~20=40164m
T1AllT10BothTop (hog.)2000mm~180360m
T10 Total (GF)
Main + Top: 1043m
Weight: ~642 kg
T8 Total (GF)
Dist bars: 476m
Weight: ~188 kg
GF Slab Steel Total: ~830 kg
· Volume GF slab: 7.6×11.0×0.125 = 10.45 m³
· Concrete M20 vol: 10.45 m³ ≈ 25.1 tonnes
· Steel @ 79 kg/m³: ~825 kg (close match ✔)
· Anti-crack mesh at slab edges
· Construction joint at beam centreline
· Slab to be poured monolithic with beams

FF/Roof Slab — Full Bar Schedule

RS1–RS6 · SAME GRID · WATERPROOFING ZONE
MarkPanelBarDirPositionLength/barNo. barsTotal m
RM1RS1–4T10lx mainBottom3900mm4×27=108421m
RM2RS5–6T10lx mainBottom4100mm2×32=64262m
RD1RS1–4T8ly distBottom3900mm4×20=80312m
RD2RS5–6T8ly distBottom4100mm2×20=40164m
RT1AllT10BothTop (hog.)2000mm~180360m
T10 Total (Roof)
Main + Top: 1043m
Weight: ~642 kg
T8 Total (Roof)
Dist bars: 476m
Weight: ~188 kg
Roof Slab Steel Total: ~830 kg
· Identical reinforcement to GF slab
· Waterproofing applied after curing
· Ensure 1% slope toward downspouts
· Expansion joint: 300mm foam board @12m
· Stainless steel chairs for bar positioning

COMBINED TOTAL SLAB STEEL
· T10: ~1284 kg (both floors)
· T8: ~376 kg (both floors)
· Grand Total: ~1660 kg slab steel