(Introduction, Syllabus, 1.Prelims, 1-4Precon, 2. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish)

Foundation Review (Foundation Checklist (PDF)
The formwork for the concrete footings is laid out on the floor of the excavation using the same workpoint and batter boards that were used to guide the excavation. The forms hold the poured concrete and steel reinforcing. Almost all steel reinforcing wire and rebar are now made from recycled material.

Foundation Phase – Insitebuilders

As soon as possible after the concrete has cured, the forms are removed, cleaned and reused in the framing for the house. This minimizes waste, reduces the cost of rigid formwork, and lowers consumption for a more sustainable approach to construction.

Foundation Phase – Insitebuilders

Building and stripping the forms and preparing them for reuse is a time consuming process that can be all but eliminated with the use of fabric forms. Fabric forms hang from horizontal screed boards and use the natural shape of wet concrete to shape the concrete.

Foundation Phase – Insitebuilders

The foundation stem walls for this house are constructed with standard concrete masonry units called “blocks.” The blocks are laid in a “running bond” using masonry tools and reinforced with horizontal and vertical steel. The steel is embedded in “grout” to form a solid structural system. Depending on site and soil conditions, the same walls could also be built using cast-in-place concrete or insulated forms.

Foundation Phase – Insitebuilders

Both masonry and concrete walls raise the frame of the house off the ground. This elevates the foundation and provides a crawl space or basement under the house to maintain and service the building during its life cycle.

Foundation Phase – Insitebuilders

A raised foundation reduces potential moisture penetration, mold and mildew, insects and insecticides, and makes it easier to add or modify the house as needs and requirements change over time.

Simplified Construction Modeling Tutorial
For anyone interested in the construction modeling techniques used for the Foundation Phase illustrations, see this quick tutorial.

The tutorial is one of more than 70 videos included in our book “Mastering the Art of 3D Construction Modeling.”

 

(To be continued…)

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The material presented in this series has been taken from our book, “How a House is Built: With 3D Construction Models” The book includes annotated illustrations, captioned text, videos, models, and the 2D Preliminaries.

Insitebuilders.com

 

(Introduction, Syllabus, 1.Prelims, 1-4Precon, 2. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish)

In the end, the efficiency of the foundation’s construction depends on the coordinated effort of a team of skilled masons. Masters and journeymen work at different rates, each with subtle variations in their techniques and demands for support.

Foundation Phase – Insitebuilders

Anticipating need
Apprentices and hod carriers support the masons by making sure everything is in place and ready for use as it is needed. Materials that arrive too soon or too late are likely to impede the pace of the work. The “mud” or mortar is especially important because temperature and time are variables that must be accounted for in mixing and placing this critical material within reach of the masons before it begins to cure. Any delay in its delivery could weaken the joints in the block wall.

Foundation Phase – Insitebuilders

The support team is also responsible for moving debris and excess materials out of the way in order to keep the site safe for everyone in the area. This means they must continuously monitor the work, anticipating the rate of construction, including bending and cutting reinforcing so that it can be installed when and where it is required.

The size and spacing of the reinforcing is specified in the construction documents and varies with the height of the wall and soil conditions. Engineers calculate its placement so that it adds tensile strength to the foundation and counters the lateral forces of wind or soil pressure.

Foundation Phase – Insitebuilders

When the wall is complete, grout is pumped into the cells of the hollow masonry units and the wall is toweled flat. Before the grout cures, anchor bolts are embedded at specified distances from the corners and at intervals along the top of the wall in preparation for the floor framing.

Foundation Phase – Insitebuilders

The pressure treated sill plates are drilled and bolted to the foundation by the framing contractors responsible for the next phase of the construction. As we’ll see in the next post, the carpenters strap the rim and floor joists to these sill plates in order to firmly tie the building’s frame to the foundation.

Keep in mind that the height of the walls above the concrete footings is determined by the same workpoint used to guide the excavation. That means the foundation’s wall height establishes the elevation of the floor framing.

(To be continued…)

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The material presented in this series has been taken from our book, “How a House is Built: With 3D Construction Models” The book includes annotated illustrations, captioned text, videos, models, and the 2D Preliminaries.

Insitebuilders.com

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HOMEBUILT HOUSE

June 16, 2014

HOMEBUILT HOUSE: A Vernacular of Uncertainty
Often thought of as squatters, our new book details the work of informal builders piecing together houses on land that others feel they have no right to occupy.

HOMEBUILT HOUSE: A Vernacular of Uncertainty

These houses are built in places where style and design have no meaning. Instead, construction begins with the hands-on challenge of piecing together a physical form using only immediately available materials as form givers.

HOMEBUILT HOUSE: A Vernacular of Uncertainty

This is an architecture sculpted without pretense or plan, governed by indeterminate events, endured in a marginal existence, and resolved according to basic human instincts for shelter and survival.

HOMEBUILT HOUSE: A Vernacular of Uncertainty

For these builders, construction is the focus of a casual process that gives life purpose in its making, sustaining not only an unregulated spirit and resilience, but a sense of pride in a visible expression of autonomy and self-determination.

In the end, there are only a few who share the instincts of an informal builder and have the courage to take on the challenge of building a home of their own.

See also.…

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(Introduction, Syllabus, 1.Prelims, 1-4Precon, 2. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish)

Once the masonry materials and equipment are in place, the project is considered staged and ready for the next phase of the construction. Most superintendents will check the project just before their arrival to make sure everything is ready to go, no one wants to upset the masons before they even get started.

Teamwork
Depending on the size of the project, the masons will work in teams that include at least a journeyman and a person called a hod carrier or hoddie. Though often mistaken for a simple laborer, a good hod carrier is important to the flow of the work because block, brick, grout, and reinforcing have to be placed within reach of a journeyman or apprentice just as these materials are needed.

Foundation Phase – Insitebuilders

Depending on union rules, a master mason might only be important for complex details or to manage additional teams on larger projects. Residential foundations like this one would usually only need to be checked for progress or to coordinate the location of anchors, conduit, or plumbing sleeves that penetrate the stem wall.

Laying Block
A plumb bob is hung from the string line intersection to mark the corners and junctures of the stem walls. The dimensions of the wall should fit a standard 8” module so they can be put together without unnecessary cutting or trimming the concrete block.

Foundation Phase – Insitebuilders

If the lengths of the walls don’t match the size of the standard masonry units, block will have to be cut to fit into the wall’s construction. This adds to the cost of the foundation and creates a break in the joint pattern of the block that is often awkward to handle with a striking tool.

Foundation Phase – Insitebuilders

The masons start in the corners, bedding the blocks to bond with the concrete footing and leveling the first course with a laser or a line level while making sure the corners are square

Foundation Phase – Insitebuilders

As they place the block, the J-bar coming out of the footing is fitted to the hollow core of the block, sometimes bending the rebar slightly to center the reinforcing. Additional lengths of vertical rebar are tied to the J-bar as the wall rises. The hollow cavities will then be filled with grout to stiffen the wall and bind it to the footing.

Foundation Phase – Insitebuilders

The top of the block or a hand level is struck with the trowel to seat the block into the mortar joint and any horizontal reinforcing that might be required. Joints are troweled flush or struck with a concave tool depending on project specifications. Parging might also be applied in extremely wet conditions to provide a smoother surface for waterproof sealers.

Platforms and scaffold make the work easier by bringing each course to a comfortable height. Guardrails are required for fall protection if the wall rises above limits set by construction safety codes.

(To be continued…)

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The material presented in this series has been taken from our book, “How a House is Built: With 3D Construction Models” The book includes annotated illustrations, captioned text, videos, models, and the 2D Preliminaries.

Insitebuilders.com

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(Introduction, Syllabus, 1.Prelims, 1-4Precon, 2. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish)

With the site cleared for the next step in the foundation’s construction, a stem wall is needed to support the floor framing. Stem walls make it possible to raise the floor level for storm cellars, basements, or mechanical crawl space.

A raised foundation also changes the profile of a building, reducing potential moisture penetration, mold and mildew, insects and insecticide contamination, and makes it easier to add or modify the house as mechanical requirements change over time. See the website for the Southern Forest Products Association.

Foundation Phase – Insitebuilders

The stem walls and piers could be built using cast-in-place concrete with rigid or insulated forms. Cast concrete walls have the advantage of being a strong monolithic structure in wet or difficult soil and are required by code for earthquake engineering, heavy loads, and some soil, ground water, or site conditions

Checking the footing
The foundation walls for this building are constructed with standard concrete masonry units (CMU). The concrete blocks are laid using common tools and reinforced with horizontal and vertical steel that is embedded in grout to form an integrated structural system.

Before beginning the wall’s construction, the site is cleared for safety, string lines are replaced on the batter board, and the foundation is checked for compliance with the construction documents prior to finalizing preparations for the work. Verification of existing conditions is especially important when the masonry contractor is not the builder who installed the concrete footing.

Foundation Phase – Insitebuilders

The workpoint is used to check the elevation of the footings and mark the corners of the foundation walls, verifying the string line intersections (see Part 10 Foundation Footings).

Foundation Phase – Insitebuilders

The foundation stem walls extend from the top of the concrete footing up to the bottom of the sill plates that support the structural framing. That means the elevation of the footings is directly related to the reference height of the stem walls and the corresponding elevation for the floor, wall, and roof framing.

Staging the Masonry
To prevent future conflict, some builders require each subcontractor to sign off on an existing installation prior to allowing them to move material and equipment onto the jobsite and start their work. This makes subsequent specialists solely responsible for each step in every phase of the construction.

 

Foundation Phase – Insitebuilders

Staging for the masons includes lifting pallets of masonry into the excavation and setting up a mixer along with grout/mortar and sand as required. Access to water is of course critical and power may be necessary for cutting tools and rebar bending equipment. Erosion control and safety concerns for the workers are also important.

Foundation Phase – Insitebuilders

As you’ll see in the next post, the walls for this building are designed using standard block sizes and masonry dimensions to minimize cutting and fitting. This means all horizontal and vertical dimensions are specified in eight inch (8”) increments.

(To be continued…)

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The material presented in this series has been taken from our book, “How a House is Built: With 3D Construction Models” The book includes annotated illustrations, captioned text, videos, models, and the 2D Preliminaries.

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(Introduction, Syllabus, 1.Prelims, 1-4Precon, 2. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish)

Once the concrete is in place, the site should be cleared of tools, equipment, and any debris that accumulated during the pour. Fencing, barriers, and safety controls should be replaced where they’ve been removed and the batter boards and workpoint checked for damage.

Strip the formwork
It’s also important to remove the formwork as soon as possible, but only as quickly as the weather will allow. In general, stripping immediately makes it easier to remove and clean the forms and allows the concrete to cure evenly. Waiting too long can weaken the concrete because of uneven curing and make it difficult to reuse the forms.

Foundation Phase – Insitebuilders

Unless it’s extremely cold, a chemical reaction occurs that prevents the concrete from freezing, but the footing’s surfaces can also dry out if it cures too quickly. This makes timing critical and it takes experience to know when it’s best to strip the forms.

Foundation Phase – Insitebuilders

Hands-on builders consider the weather and feel the warmth of the concrete before making a judgment as to the best way to protect the concrete as it cures.

A Different Approach
All of this can be avoided with an interesting innovation in concrete formwork. Of course, it takes a long time in the construction industry to change established methods, but some innovations suggest a particularly logical approach to conventional practice.

Foundation Phase – Insitebuilders

Fabric forms use tensile membranes instead of rigid members. Concrete is contained by the geometry of the fabric, forming structural curves as pure tensile elements and ideal parabolic shapes for foundation footings.

Foundation Phase – Insitebuilders

The fabric also adapts to uneven ground and uses far less material to hold the wet concrete in place. The permeable material also allows the concrete to cure evenly with a smooth finish, reducing labor, transportation, and storage. Better yet, stripping is reduced to stakes, spreaders, and runners that are easily removed and reused in the framing as blocking.

Foundation Phase – Insitebuilders

Trying something new depends on the type and volume of work, design of the foundations, and interests of the builders who might want to give an idea like this a try. For more information, see installation diagrams and videos at www.fab-form.com and an association website at www.fabricforming.org.

 (To be continued…)

—————————

The material presented in this series has been taken from our book, “How a House is Built: With 3D Construction Models” The book includes annotated illustrations, captioned text, videos, models, and the 2D Preliminaries.


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(Introduction, Syllabus, 1.Prelims, 1-4Precon, 2. Excavation, 3.Foundation, 4.Framing, 5.Roof, 6.Close, 7.MEP, 8.Finish)

As soon as the rebar and the forms are ready, most building permits will require official approval before concrete can be placed. A code compliance inspector is then scheduled by the builder to visit the site, check the forms and rebar against the permit drawings, and authorize concrete placement with a stamp or signature.

Foundation Phase – Insitebuilders

Unless the foundation is unusually complicated, most inspectors will only take a cursory look at the formwork, spot check some rebar, and sign off without comment, after all most foundations are pretty much the same. But problems occur if the rebar is dirty, rusty, or oily, or the formwork somehow affects public property. Rarely is the inspector concerned about the foundation’s design or engineering, that’s a given.

PrePour Checklist
Good builders use a checklist to make sure the foundation is ready for inspection and anticipate any possible delay. Concerns include a final check of the formwork for gaps, weaknesses, or missing hardware, cleaning the forms and reinforcing, checking the position of sleeves and brackets, and making sure required insulation, expansion joints, and vapor barriers are installed.

Foundation Phase – Insitebuilders

Prior to ordering concrete, it’s important to make sure all the necessary tools and equipment are on site and ready to use. This includes shovels, water, vibrators, spreaders and trowels. High density lighting might also be required on short winter days, especially if there’s any possibility of a delay.

In addition, a safety officer should be assigned to check the weather, designate safe zones, truck routing and staging, mark power lines, check all equipment, and secure the wash down area. The entire site is then cleared of unnecessary tools, trash, and personnel.

Foundation Phase – Insitebuilders

Placing the Concrete
Once the concrete has been scheduled, a biodegradable release agent is applied to the forms to prevent bonding. A concrete pump makes it much easier to move concrete around the site, reducing risk and the number of laborers required for the work, as well as making it easier to spread and vibrate the material once in place.

Foundation Phase – Insitebuilders

The number of concrete trucks depends on the volume of material required, the supplier, and jobsite conditions. For large projects, more than one truck will mean staging the work according to volume calculations and site conditions in order to control joints, minimize waste, and prevent potential contamination from excess concrete runoff.

 (To be continued…)

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The material presented in this series has been taken from our book, “How a House is Built: With 3D Construction Models” The book includes annotated illustrations, captioned text, videos, models, and the 2D Preliminaries.

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