Underpinning Meaning Underpinning — strengthening an existing foundation New support is built below the current footing in controlled stages Existing wall + footing New underpin pin / pocket Excavated pit (temporary support elsewhere) Work proceeds in bays — never undercut the full length at once Underpinning section — existing footing is extended deeper or replaced…
Workability of concrete Workability of concrete — slump bands (indicative) Low Medium High 0 ~150+ mm slump Mass footings need stiff mixes; pumped slabs need higher slump Always match workability to placement method — not “more slump is better” Target values from mix design and IS 456 guidance — confirm with QC engineer Workability is…
What are fly ash bricks? Fly ash brick — typical composition Industrial by-product blended with binder and fine aggregate, then pressed and cured Fly ash (major filler) Cement / lime binder Sand or stone dust Mix ratios vary by manufacturer — IS-marked bricks should meet relevant standard tests Press-moulded and often steam-cured for strength Fly…
What is a Retaining wall Retaining wall — cantilever section Wall holds back soil on one side; stability depends on weight and base width Backfill soil Toe Stem Heel Earth pressure Illustrative — base width, drainage, and reinforcement from retaining-wall design Cantilever retaining wall section — stem and base slab resist soil pressure; toe and…
What is a Shear Wall? Shear wall — resists lateral loads Stiff vertical cores carry wind and seismic forces to the foundation Shear wall core Wind / seismic Typical in multi-storey RCC frames — layout from structural engineer Shear wall elevation — vertical cores resist horizontal forces from wind or earthquakes and transfer them to…
What Is an Isolated Footing foundation? Isolated footing — plan view Single column load spread through a pad footing Column / pedestal Pad extends beyond column face on all sides — size from soil bearing and load Isolated (pad) footing plan — a single column or pedestal bears on a spread footing sized for safe…
Carpet area What is the carpet area? The portion of the house or apartment that a carpet might be used to cover is the “carpet area.” In certain areas, the term “carpet area” is synonymous with “net useable area.” Simply put, “carpet area” refers to the space in your house that is eligible for placing…
What is a Combined Footing? Combined footing — plan view One concrete pad carries two adjacent columns Col 1 Col 2 Column spacing Used when isolated pads would overlap or bear near a property line Combined footing plan — two columns share one pad when separate isolated footings would interfere or overlap. A combined footing…
Introduction A pile foundation is a particular kind of deep foundation that is often used to support constructions that are subjected to significant loads. Piles are long, slender columns which are driven into the ground to a depth where they can bear the load of the structure. Pile foundations are used when the soil is…
What is Plastering Plastering — wall section Multiple coats level the surface and protect masonry Masonry / RCC Scratch / base coat Brown / finish Total thickness often 12–20 mm over two or three coats Mix ratios and coat names vary — follow site specification Plaster wall section — base coat keys to masonry; finishing…