Architect and Civil Engineering Company

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16/12/2025
‎ DOs and DON’Ts ENGINEERS MUST FOLLOW TO MAKE CONSTRUCTION DURABLE AND STRONG‎‎‎✅ DOs (What engineers MUST do)‎‎1. Do p...
16/12/2025

‎ DOs and DON’Ts ENGINEERS MUST FOLLOW TO MAKE CONSTRUCTION DURABLE AND STRONG


‎✅ DOs (What engineers MUST do)

‎1. Do proper soil investigation

‎Always carry out soil test / trial pits before foundation work.

‎Know the bearing capacity, water table, and soil type. 👉 A strong building starts from the ground, not from blocks.



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‎2. Do correct foundation design

‎Match foundation type to soil:

‎Strip footing for good soil

‎Raft or pile for weak soil


‎Ensure correct foundation depth and width 👉 Foundation failure = total building failure.



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‎3. Use the right material quality

‎Cement: fresh, not expired or lumpy

‎Sand: well-graded, free from clay

‎Aggregates: clean, strong, correct size

‎Steel: correct diameter, no rust 👉 Cheap materials = expensive repairs later.



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‎4. Maintain proper concrete mix

‎Follow mix ratios strictly (e.g. 1:2:4, 1:3:6)

‎Measure with gauge box, not “eye judgment”

‎Use clean water 👉 Wrong mix = weak concrete.



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‎5. Ensure good workmanship

‎Proper compaction (vi****or or rod)

‎Correct curing (minimum 7–14 days)

‎Straight walls, correct alignment 👉 Good materials + bad workmanship = failure.



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‎6. Provide proper reinforcement detailing

‎Correct bar size, spacing, laps

‎Maintain concrete cover (use spacers)

‎Proper bending of bars 👉 Steel is the backbone of reinforced concrete.



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‎7. Control water and drainage

‎Provide good site drainage

‎Proper soakaway / septic tank location

‎Damp proof course (DPC) at correct level 👉 Water is the number one enemy of buildings.



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‎8. Supervise continuously

‎Be present during:

‎Excavation

‎Foundation casting

‎Slab and column casting 👉 Engineering is not “check once and go”.




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‎❌ DON’Ts (What engineers MUST avoid)

‎1. Don’t skip soil testing

‎Never assume soil strength

‎What works next door may fail on your plot



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‎2. Don’t reduce reinforcement

‎‎‎SEPTIC TANK – SITE ENGINEERING EXPLANATION‎‎On site, the septic tank is the first structure we construct for sewage t...
16/12/2025



‎SEPTIC TANK – SITE ENGINEERING EXPLANATION

‎On site, the septic tank is the first structure we construct for sewage treatment.

‎1. Setting Out

‎We set it out away from the building (about 3–5 m)

‎Make sure it’s accessible for desludging truck



‎2. Excavation

‎Excavate to required depth

‎Bottom must be firm and level



‎3. Base Construction

‎We cast a concrete base slab

‎This is important because the septic tank must not leak



‎4. Walling

‎Build block walls (usually 9-inch blocks)

‎Plaster inside with waterproof mortar

‎Ensure the tank is fully watertight



‎5. Compartments

‎Construct two chambers

‎First chamber larger (takes faeces and solids)

‎Partition wall has opening below water level



‎6. Inlet & Outlet

‎Fix PVC inlet pipe from WC with slope

‎Use T-pipe or baffle so faeces drops down

‎Outlet pipe only allows clarified liquid out



‎7. Vent Pipe

‎Fix vent pipe to release gas

‎Prevent pressure and bad smell



‎8. Cover Slab

‎Cast reinforced concrete cover

‎Provide manholes for maintenance




‎👉 Site purpose:
‎Septic tank holds faeces, allows solids to settle, and partially treats sewage before sending liquid to soakaway.


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‎SOAKAWAY – SITE ENGINEERING EXPLANATION

‎On site, the soakaway is constructed after the septic tank, and it is only for liquid effluent, not faeces.

‎1. Location Check

‎Construct it far from foundations and boreholes

‎Must be in permeable soil



‎2. Excavation

‎Dig circular or square pit

‎Depth depends on soil condition



‎3. Bottom Preparation

‎No concrete base

‎Fill bottom with stones or gravel



‎4. Wall Construction

‎Build honeycomb blockwork

‎Leave open joints for water to escape



‎5. Backfilling

‎Backfill outside walls with gravel

‎Helps quick percolation



‎6. Inlet Connection

‎Connect outlet pipe from septic tank

‎Ensure free flow, no backfall



‎7. Cover Slab

‎Cast light reinforced slab

12/10/2025
22/04/2025

House wall construction

Biggest mistake in construction
22/04/2025

Biggest mistake in construction

Ready for concrete Pouring
22/04/2025

Ready for concrete Pouring

08/04/2023

Good day engineers, we want to make this page a place where you can learn through videos, picture and all that, we will like to know your opinion on this, should proceed or not, thank to you all

Address

Jakande First Gate
Lagos

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