What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
Concrete deck piers support deck posts and beams; house foundation piers support a building’s primary load path or underpin an existing foundation. They may look similar above ground, but their dimensions, depths, reinforcement, soil assumptions, and installation methods are not interchangeable. A deck footing can often be selected from a prescriptive table when the project fits stated conditions. A house pier used for settlement repair requires diagnosis and an engineered repair plan.
The safest approach is to treat deck work as a code- and site-dependent footing design, and house-pier work as structural rehabilitation. The American Wood Council deck guide supplies useful prescriptive details, while HUD’s foundation-repair guidance and its Residential Structural Design Guide explain why house-pier repairs must be based on the building, soil, and observed movement.
As an Amazon Associate I earn from qualifying purchases.
What is the difference between a concrete deck pier and a house foundation pier?
A deck pier is an isolated footing or pier that transfers the reactions from a deck post into the ground. A house foundation pier is part of the home’s foundation system, or a new support installed beneath an existing foundation to carry loads during underpinning. The second job involves the whole building load path, not just the weight tributary to one outdoor post.
| Issue | Deck concrete pier | House foundation pier |
|---|---|---|
| Primary job | Support deck posts, beams, joists and the deck’s share of live and dead load. | Support a primary foundation element or transfer load around a settled or weakened area. |
| Design basis | Prescriptive tables may apply when spans, loads, materials and soil assumptions match the guide. | Project-specific structural and geotechnical evaluation, including the existing foundation and cause of movement. |
| Typical risk | Settlement, frost movement, inadequate bearing, poor post connection or conflict with utilities. | Progressive settlement, unsafe load transfer, damage to the structure, groundwater problems or construction-induced movement. |
| Who should design it? | A competent designer or contractor working from the adopted code and permit requirements; unusual loads need professional design. | A structural engineer and, where soil conditions require it, a geotechnical engineer, with experienced contractors carrying out the work. |
HUD describes a foundation as distributing building loads so soil bearing capacity is not exceeded and lateral movement or settlement is minimized. A residential foundation can include a footing, wall, slab, pier, pile or combination. That broad role is why a house pier cannot be sized by copying a deck-footing diameter from an online table.
Popular on Amazon
- Ergonomically Designed: Work in tight areas with a compact design that gets into tough spots
- Both tools are designed to fit into difficult to reach spaces
- Complete a wide range of applications with a high-performance motor that delivers up to 300 UWO, and an impact driver delivering up to 1,400 in-lbs of torque
- Both the DEWALT impact driver and drill driver feature integrated LED work lights with a convenient 20-second delay, ensuring enhanced visibility in dimly lit or challenging work areas
- One-Handed Loading - Keep one hand free with a 1/4 in. hex chuck that accepts 1 in. bit tips
How do concrete deck piers carry a deck’s load?
Load travels from the walking surface to joists, beams, posts, post anchors, the concrete pier and finally the supporting soil. Each post’s reaction depends on beam and joist spans, post spacing, lumber species, the deck’s dead weight and the required live load. A pier that is adequate for one post layout may be inadequate after a beam is moved, a span is lengthened or a heavy feature is added.
The AWC Prescriptive Residential Wood Deck Construction Guide is based on the 2015 International Residential Code and gives footing configurations and a sizing table for defined wood-deck conditions. Its table assumes a 40 pounds-per-square-foot live load, 10 psf dead load, 1,500 psf allowable soil bearing capacity, 150 pounds per cubic foot concrete and 2,500 psi concrete compressive strength. Those are assumptions for the guide’s calculation, not universal properties of your lot or concrete.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →The guide illustrates arrangements including a concrete pier or stem supported by a spread footing. The correct arrangement depends on the actual reactions, excavation conditions, frost requirements and the authority having jurisdiction. A concrete form tube by itself is not a design; it is only a way to shape concrete after the footing dimensions and reinforcement have been established.
How do I size a concrete deck footing?
Use a prescriptive table only after confirming that its scope and assumptions fit your deck. If they do not, obtain a site-appropriate design rather than treating the nearest table value as a universal answer.
- Map the structure. Record beam spans, joist spans, post spacing, cantilevers, ledger or freestanding configuration, lumber species and all concentrated loads. Identify which posts are interior, end or corner posts because their tributary areas differ.
- Confirm the loading basis. Compare the project with the guide’s 40 psf live and 10 psf dead load assumptions. A roof, masonry feature, privacy wall, outdoor kitchen, stairs with unusual geometry or other concentrated load can change the reactions.
- Check soil information. The table assumes 1,500 psf soil bearing. If the building official expects a lower allowable value, the AWC guide calls for a soils investigation. Fill, soft clay, organic soil, expansive soil, a high water table or evidence of prior movement should trigger additional evaluation.
- Apply the applicable table or design. Use the row matching the post’s tributary area and the actual beam and joist spans. Do not round down, substitute a different concrete strength without design review or treat the result as valid for a hot tub or another large concentrated load.
- Resolve connection and uplift. The post, pier, anchor and beam must form one continuous load path. Manufactured post anchors for wood deck footings should be galvanized or stainless steel, as specified by the AWC guide, and the selected connector must match the post size, concrete, exposure and applicable approval.
- Verify local approval. The guide is technical background, not confirmation of the code currently adopted in your jurisdiction. Local amendments, inspection stages, frost depth and permit drawings control the project.
When a deck carries a hot tub, spa or another large concentrated load, the AWC guide excludes that condition from its prescriptive scope. Such a deck needs a separate design that accounts for the concentrated reaction and any effects on framing, posts, footings and nearby foundations.
How deep should deck footings be?
Footings must bear on competent, undisturbed soil and satisfy the locally required frost depth. The AWC guide states:
“All footings shall bear on undisturbed soil at least 12 inches below the undisturbed ground surface or below the frost line, whichever is deeper.”
Also popular on Amazon
Sale
Nicpro Mechanical Carpenter Pencils for Construction (Black, Red) With Case | Deep Hole Marker Pencil Set Includes Sharpener and 26 Refills, Comfortable Grip, Heavy Duty Woodworking Tools for Architect
- Valued Carpenter Pencil Set: You will get 2 pcs solid carpenter pencils with 26 piece 2.8 mm refills, 1 replaceable sharpener, 1 plastic storage box.The complete carpenter pencils combination allows you to finish your work faster and more easily
- Deep Hole Marker Pencil: The deep-hole construction pencils adopts 45mm elongated tip design, which is more convenient to mark in the small hole or in other tight areas that other carpenter markers cannot reach
- Carpenter Pencils with Sharpener: The sharpener is screwed into the top of the work pencil, which won't get lost either. Built-in pencil sharpener that keep the lead with pointed and smooth to Improves line of sight in fine work
- Stronger Solid Lead: This work pencil is matched with a 2.8 mm thick lead , which is much thicker and stronger during the drawing process of construction work, it will not break or damage easily
- Marks on Various Surfaces: 3 colors solid construction pencil can marks on various surfaces,such as metal, plastic, wood, paper etc. Ideals for woodworkers, contractors, craftsmen, builders, merchants and masons
That sentence gives a minimum condition within the guide’s scope, not a universal excavation depth. Ask the local authority for the specified frost line, then excavate to the deeper of that requirement or 12 inches below undisturbed grade. A footing placed on loose backfill, topsoil, uncompacted trench material or soil softened by water may settle even if its diameter is otherwise sufficient.
Have the bearing surface checked before concrete placement. Keep spoils, standing water and debris out of the hole, and do not assume a previously excavated hole has the same soil quality as undisturbed ground. If excavation reveals fill, voids, rock, groundwater or a different soil layer than expected, stop and obtain direction rather than pouring against an unverified condition.
How close can a deck footing be to a house foundation?
Proximity matters because a new excavation can remove lateral support from the house footing or load soil that behaves differently from the original foundation soil. The AWC guide gives a specific requirement:
Recommended Free Tools
“DECK FOOTINGS CLOSER THAN 5′-0" TO AN EXTERIOR HOUSE FOUNDATION WALL MUST BEAR AT THE SAME ELEVATION AS THE FOOTING OF THE HOUSE FOUNDATION.”
Measure the horizontal distance to the exterior foundation wall and determine the house footing elevation before excavating. “Same elevation” is not a visual guess from the top of the basement wall; it refers to the bearing level of the existing house footing. If that level cannot be established safely, consult the building official or a qualified designer.
Locate buried electrical, gas, water, sewer, drainage, septic and communications lines before digging. The AWC guide warns against placing deck footings over septic systems, leach fields, utility lines or enclosed meters. A footing that blocks access to a meter or damages a drain can create a problem unrelated to its concrete strength.
Which anchors and materials belong on a deck pier?
The post connection must keep wood above concrete and transfer compression, lateral forces and any required uplift into the footing. For wood deck footings, the AWC guide specifies manufactured post anchors that are galvanized or stainless steel. Select the connector for the actual post dimensions, exposure category, concrete installation and the loads shown on the approved design.
Also popular on Amazon
- 【Great Compatibility】This Katerk 1/4 inch hex shank bit holder is specifically designed for 1/4 inch hex shank drill bits. It's compatible with most 1/4 fast hex handles, hex sockets, various electric screwdrivers, and handheld screwdrivers. The bit holder makes it a valuable addition for any handyman.
- 【Secure and Safe】Built with a secure backup nut design, each drill bit holder securely locks onto your bits, ensuring they stay firmly in place. Additionally, our bit holder incorporates a high-quality steel ball rolling design that holds up to several kilograms of weight, ensuring your various drill bits don't fall off.
- 【Easy One-Handed Operation】The bit holder for impact driver allows you to change bits single-handedly, simplifying your workflow. Its multi-color design further allows for quick identification of the drill bit you need.
- 【Compact and Convenient】Thanks to its compact size, this 1/4 inch bit holder is easy to carry around. The bit holder allows for easy attachment to various tools, making this a convenient addition to your construction accessories. The Katerk bit holder is cast from high-quality alloy material, promising a long product lifespan. Despite its rugged strength, the bit holder remains lightweight, making it portable.
- 【Cool Christmas Gift For Men Stocking Stuffers】 This screwdriver bit holder, driver bit holder, impact bit holder, can be given as a gift to your loved one, especially for anyone involved in construction or electrical work. It's a must-have for stocking stuffers for men and women, tools gifts for dad, tech gadgets for men, gifts for dad, gifts for him, gifts for husband, gifts for boyfriend, cool gadgets for men, and cool gifts for dad.
Cast-in-place work may also require form tubes, reinforcing steel, chairs, tie wire and a footing enlargement or spread base. These materials do not replace engineering. Reinforcement must be located as designed so it remains properly embedded, and the concrete placement must avoid segregation, contamination or an unplanned cold joint. Follow the concrete specification and inspection requirements in the permit documents.
What are concrete piers used for in house foundation repair?
A house pier can be a permanent foundation element or an underpinning support installed beneath an existing footing. In an underpinning project, the objective is to transfer building load to a deeper or stronger bearing stratum, or to develop support through a designed friction mechanism, while controlling movement during construction.
HUD’s rehabilitation guidance describes reinforced-concrete piers as one underpinning method. Depending on the design, workers form and reinforce a pier beneath an existing footing, place concrete and then transfer load to the new support. The passage is descriptive guidance, not a do-it-yourself sequence or a standard detail for every house. Pier size, spacing, depth, reinforcement, connection to the existing footing and the order of work depend on the diagnosed condition.
HUD’s residential design guide explains the larger principle: foundations transfer building loads to the earth and distribute them so bearing capacity is not exceeded and movement is minimized. A repair pier therefore has to be checked against the house’s walls, beams, floors, roof reactions, foundation type, soil profile, groundwater and the forces created by excavation. A round concrete shaft that looks substantial may still be ineffective if it is not connected to the load path.
Free tools Windows power users keep installed
One-click scans. No signup required.
How is a house-pier repair diagnosed and designed?
Settlement is usually gradual, and HUD recommends investigating its cause before selecting an expensive repair. The process should establish why movement occurred and whether it is ongoing, not simply react to one crack.
- Document symptoms and history. Record crack locations and widths, sloping floors, sticking doors, drainage changes, additions, plumbing leaks, nearby excavation and any prior repairs. One crack rarely identifies the mechanism by itself.
- Inspect the existing foundation. Determine whether the house uses a basement wall, crawl-space wall, slab, masonry foundation, strip footing, isolated footing or a combination. Check condition, dimensions, reinforcement where known and signs of rotation, shear or loss of bearing.
- Characterize the ground. A geotechnical engineer may need soil borings, test pits, groundwater observations or other information to establish bearing layers and the likely cause of settlement. Expansive, compressible, eroded or water-affected soil can require a remedy beyond simply adding concrete.
- Trace the load path. The engineer identifies which wall, beam or footing section is carrying load and how a new pier will receive it. The number and arrangement of piers depend on the settled area and the distribution of reactions, not on a standard spacing copied from another project.
- Design the installation sequence. Underpinning can temporarily alter loads. The plans should specify excavation stages, temporary shoring where needed, reinforcement, concrete placement, the connection or packing detail and how load is transferred to the new pier.
- Inspect and monitor. Repairs should be carried out by experienced contractors under a professional engineer’s direction, as HUD recommends. The engineer should define hold points, required observations and any post-repair monitoring so movement can be distinguished from normal seasonal behavior.
Correcting drainage, a leaking service line or another source of soil loss may be part of the repair. Installing piers without addressing the cause can leave the house exposed to renewed movement or transfer distress to another section of the foundation.
Can a deck-footing detail be used for a house pier?
No. A deck footing table is tied to a specific deck geometry, loading model, soil assumption, concrete strength and code scope. A house pier must be designed for the existing building and the reason for movement, often with geotechnical information and a staged load-transfer plan.
Also popular on Amazon
- Toolwiz 17-inch magnetic sweeper maintaining a load capacity of up to 8.8 pounds provides a perfect solution to the problem of clearing small ferrous metal objects, such as nails, tacks, bolts, and metal shavings from workshops or garage floors.
- Convenient and portable：17” is good for home, small workshop, or small yard as it is space-saving and more reachable for narrow areas. Perfect for collecting nails or small parts in the car, under the table, and in other nooks or crannies.
- Upgraded Handle Design: The handle features a sturdy, non-telescopic design to completely prevent slipping during use. By simply adding or removing the extension poles, the height can be adjusted to 3 different lengths: 18.9" (48 cm), 32.5" (82.5 cm), and 42.5" (108 cm) from ground to top. This customizable height helps prevent back bending and muscle strain, making your cleaning tasks effortless
- Flexible wheels: Upgrade wheel screws to avoid being too tight to spin or too loose. More comfortable 3-inch rubber wheels roll smoothly on carpet, grass, concrete, and hardwood floors. Just push and pull this rolling magnet-sweeper to pick up metal nails easily.
- Lightweight materials: The magnetic nail sweeper's compact and lightweight design makes the sweeping can be done anywhere you want, Push or pull it under the furniture, passing through the workshop floor, driveway, mud, grass, and gravel.
The numbers can also create false confidence. The AWC assumptions of 1,500 psf soil bearing, 40 psf live load, 10 psf dead load, 150 pcf concrete and 2,500 psi concrete may not describe either your deck site or your house foundation. Conversely, a house underpinning pier may need a bearing depth, reinforcement cage or connection detail that has no counterpart in a prescriptive deck table.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11What should a homeowner verify before concrete is poured?
- Scope: Is the work a deck footing, a primary house foundation element or underpinning? The answer determines who should design it.
- Soil: Is the bearing surface undisturbed and suitable, and does the assumed allowable bearing match documented site conditions?
- Depth: Does the excavation meet the local frost requirement and, near the house, the required relationship to the existing footing elevation?
- Loads: Are hot tubs, roofs, walls, stairs, masonry or other concentrated loads included rather than treated as ordinary deck loading?
- Utilities and access: Have underground services, septic components, leach fields and meters been located and protected?
- Connections: Does the specified galvanized or stainless post anchor fit the post and approved design, and is the wood kept out of standing water?
- Inspection: Are permit drawings, required inspections, concrete specifications and engineer or building-official hold points identified before the pour?
Photographing the excavation, reinforcement and anchor placement before concrete covers them can preserve useful project records, but photographs do not substitute for a required inspection.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What common problems require a change in plan?
The hole hits loose fill or water: stop work and have the bearing condition evaluated. Increasing the concrete diameter without confirming the soil may not solve the problem.
The footing is within five feet of the house but cannot reach the house footing elevation: do not create a stepped excavation by guesswork. The detail may need redesign to protect the existing foundation and maintain the required bearing relationship.
The deck design changes after the footings are laid out: recalculate post reactions if spans, post spacing, beam locations or concentrated loads change. Moving a post can invalidate the selected footing.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Cracks continue after house-pier work: continuing movement may indicate an uncorrected drainage or soil problem, an incomplete load transfer or movement elsewhere in the structure. Ask the engineer to review monitoring data and the original diagnosis before adding more piers.
A contractor proposes a generic “standard” house pier: request the sealed design basis, soil assumptions, load-transfer sequence and inspection plan. HUD specifically advises consultation with a structural or specialized geotechnical engineer and experienced contractors for settlement repairs.
Also popular on Amazon
- APPLY TO MOST DRILLS : 6 pieces screw extractors work with any drill and all the screw size or bolt (3-12mm), These extractor tools are used to reverse the damaged screw counterclockwise until it is released
- The DIY Tools for Men-Men won't know they need screw extractor set until they have one! This screw extractor set is GIFTS WRAP AVAILABLE, can be gifted to your loved ones as it reflects a fresh trend with fun and practical. Amazing and Unique tool gifts for men women. The must have stocking stuffers for men, gifts for dad, husband, father, him, guy teens, adult, Boyfriend, son on Birthdays, Christmas, Fathers Day or anniversary. Perfect Holiday Gifts Guide
- HIGH QUALITY - This damaged screw remover tool kit is made from High-Speed Steel H.S.S 4341# , which have high hardness of 63hrc, it's durable and easily to remove any damaged screws.
- EASY TO USE: Just two simple steps to get the job done - drill a hole with a cutting size using the right size screw extractor and easily remove the screw or bolt using the removal tool Hardness 63-65HRC: Titanium hardened steel material, more durable than most screw extractors on the market, better hardness and durability than others, buy with confidence and complete peace of mind
- Cool Gadgets for Men Dad Christmas Birthday Gifts for Men and Women - Men won't know they need screw extractor sets until they have one! Every screw has the potential to rust and break, which can create a situation where it cannot be removed. Owning it, there will be no anxiety about rusty screws. This screw extractor set is GIFTS WRAP AVAILABLE, can be gifted to your loved ones as it reflects a fresh trend with fun and practical. Amazing and unique tool gifts for men women. A must have stocking stuffer for men on birthdays, Christmas, Father's Day or anniversaries, a gifts for dads, husbands, fathers, him, adults, boyfriends, sons. The best and most practical and surprising Christmas gifts
Which source should govern the final decision?
For a conventional wood deck, start with the locally adopted residential code and the AWC prescriptive guide, then verify soil, frost depth, proximity to the house, utilities, connections and any unusual loads. The guide was published in 2018 and is based on the 2015 IRC; code adoptions and amendments vary by jurisdiction.
For a house foundation pier or underpinning repair, the project-specific structural and geotechnical design governs. HUD’s guidance is valuable for understanding foundations, settlement and rehabilitation, but it does not establish a universal pier diameter, spacing or depth. When the site or building falls outside prescriptive deck conditions, professional design is the safer and usually faster path to an approvable repair.
What is the practical bottom line?
Build deck piers from the deck’s actual tributary loads, verified soil and frost requirements, approved connections and local inspection rules. Treat house piers as foundation engineering: investigate the cause of movement, design the load transfer and construction sequence, and have qualified professionals direct the work. Similar-looking concrete cylinders do not perform the same structural job.
Frequently Asked Questions
Does making a deck pier wider always make the deck safer?
No. Width helps only when the supporting soil, depth, reinforcement and post connection are adequate. A wider pier placed on poor fill or above the required frost depth can still settle or move.
What if the soil at my deck footing is rated below 1,500 psf?
The AWC prescriptive table no longer matches its stated bearing assumption. The guide calls for a soils investigation or another approved design so footing area and construction details reflect the actual ground.
Can foundation settlement be repaired before the movement stops?
Sometimes, but the cause and rate of movement must be evaluated first. An engineer may recommend drainage or soil corrections, monitoring, or a staged underpinning plan rather than immediately installing permanent piers.
What documents should I request for a house-pier project?
Ask for the engineer’s investigation and design, soil assumptions, pier layout, reinforcement and load-transfer details, excavation or shoring sequence, permit information and inspection requirements. Keep records of site conditions and any monitoring specified after the repair.
