Part 56: Finish Phase – Cabinetry

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

Most residential kitchens and bath cabinets are modular units, prefabricated assemblies, built to match standard cabinet dimensions and installed by finis carpenters.

Kitchen and bath planners
Modular units are laid out using kitchen and bath planners available online. These include online planners from the big box stores like Home Depot and Lowes, as well as websites like CliqStudios or National Kitchen and Bath Association.



By far, the easiest and most intuitive cabinet design tool is the one offered by IKEA. To aid customers, the company publishes Quick Start and Guide videos that make the kitchen and bathroom planning process completely intuitive.



The Ikea planner uses a two and three dimensional graphic interface to visually guide the design. There are icons and menus to locate doors, windows, plumbing, electrical, and other features that need to be incorporated into the final layout. (Millimeter to feet converter).



The planner also keeps a running inventory, along with the cost of the cabinets, to make it easier to order the cabinets (from any supplier). Plans and specifications can also be printed to guide the installation.

Modular cabinet design
Prefabricated cabinets reduce the cost of materials and installation. Their modular construction also makes it easier to coordinate their installation into the construction schedule.



Because the cabinets are finished on all sides, they can be uninstalled and rearranged as the kitchen and bathrooms evolve over the life of the house.



Note that countertops must be measured for sink cutouts, backsplashes, and other special features after the cabinets are installed. That means plumbing and electrical fixtures can’t be finalized or tested until the countertops are in place. . .  




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(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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Part 55: Finish Phase – Furnishings

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

Finish carpentry includes baseboards, chair rails, wainscoting, crown molding, shelving, cabinets and stairs. This kind of carpentry is not as physically rigorous as exterior construction and requires an entirely different set of tools and skills.

Stair construction
Interior work is not normally regulated by building codes. Exceptions include secondary structural installations, some types of materials, and hand and guard rails, balusters, and stair treads and risers (See Buzzwords).



The Stairway Manufacturers Association provides detailed guidelines for stair manufacturing, including general codes and standards.

Prefabricated installations
Access stairs that are required for upper floors are usually built into the structural framing and approved by the local building inspectors prior to issuing a building permit, but there are also prefabricated stairs for installation by finish carpenters and wood workers.



In this example, a prefabricated ships ladder is used to access the storage loft. The ladder is retractable and detailed on shop drawings for fabrication and installation. See websites similar to the Loft Centre for ideas and specifications.

If the loft is to be occupied and space is at a premium, a circular stair is a good alternative to the ships ladder.



Circular stairs are designed to meet all code requirements and are cut and assembled on site by metal fabricators to match field dimensions.

Efficient design
The value of interior designers as opposed to building designers is that they find ways to increase the efficiency of a given space. For example, the space under a stair can be used for storage.



But the installation of special features such as these must conform to local building codes. In this example, if there is not an alternate exit from the upper floor, built-in storage under the stair may be rejected as a fire hazard. . .





(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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Part 54: Finish Phase – Wall board

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

The most common type of wallboard is drywall, also known as sheetrock, but there are many alternatives, including lath and plaster, paneling, plastic sheeting, fiberboards, and tile. Drywall is by far the best solution for residential construction.

Hanging Drywall
Drywall is a paper wrapped gypsum product, manufactured by companies like the National Gypsum Company. You can find detailed information about the different types of gypsum wallboard used in construction on their website.


Residential drywall is typically four by eight feet and 1/2” thick, but it’s also available in ten foot lengths and as a 5/8” thick Type X material for areas that require fire resistance.

Starting with the ceilings, the wallboard is lifted into place with a panel hoist and attached with specially designed drywall screws.



The gypsum boards are screwed to the wall studs. Galvanized metal corner beads are used to seal corners, as well as the door and window frames.

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Alternate corner and edge trims include "L" or "J" plastics and structurally laminated materials for special conditions.



Finishing Drywall
The corner beads act as screeds for alternating layers of a drywall joint compound, also known as “mud.” Joints or seams between the drywall boards are “taped” using paper strips embedded in the same joint compound.



The joint compound is applied in layers over the taped seams, corner trim, and drywall screws. It’s important that the drywall screws dimple the board and not penetrate the paper skin.



Taping is not difficult, but it’s a technique that takes practice. For more information, see Dean's drywall tips for an overview of the tools used to finish the drywall.

Paneling and tile
Paneling is installed over taped but unfinished drywall in high impact areas like dining alcoves, stairways, and playrooms that are likely to get bumped or scratched by furniture and heavy use.



A special wax coated “green” drywall is often used in wet areas, but cement backer boards are used behind areas to be tiled, such as showers or baths.



Because drywall is essentially a porous material, local building codes govern construction details to control moisture and prevent long term mold and mildew damage.
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(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.
youtube.com/watch?v=xZj19OPzE08

Part 54: Finish Phase - Insulation

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

On most projects, work continues inside the building at the same time as the sitework. The interior work begins with wall and roof cavity insulation, sealing the underside of the floor joists, and expansive foam injected into the seams in the framing to prevent drafts and air loss.

Insulation
In this example, the roof rafters and ceilings are insulated with batt insulation. Foil and rigid insulation boards were laid on the roof’s upper surface at the same time the metal roofing was installed – see Roofing.

When a truss roof is used, the bottom chords of the trusses are filled with blown fiberglass.



The wall cavities are filled with batt insulation or an expansive-foam. Rigid insulation was installed against the foundation walls prior to the excavation backfill.

Detail of insulation types
This wall section illustrates how heat is transferred through the ceiling, walls, and foundations of the building.



Heat transfer
Heat is conducted through the exterior surfaces over time. A warm room will lose heat to cold outside air and, conversely, a cool room will draw in heat from warmer outside temperatures.



Insulation slows the rate of the heat transfer and the rate of the transfer varies according to the weather, type of construction, and total R-value of the exterior surfaces.



R-value is the measure of resistance to heat transfer. The greater the R-value the slower the heat transfer. Every component of the construction adds to the total R-value, but only the insulation adds significant thermal resistance.

Calculating heat loss and heat
Energy is expended by the building’s mechanical system as it adjusts the heating or cooling supply to moderate indoor air temperature.


For complex structures, mechanical engineers use performance-based heat loss calculations to determine the size of the mechanical system. For standard residential construction a prescriptive code lists minimum R-Value for all outside surfaces.



Calculations are then based on temperature differentials, volume of the conditioned spaces, surface R-values, and the size and location of windows and other openings. Heat gain calculations also take into account the number of occupants, solar exposure, equipment, and appliances.



Heating and cooling requirements for the mechanical system are specified in British thermal units (BTU). The efficiency of the system is measured as a Seasonal Energy Efficiency Ratio (SEER or ESEER). The higher the SEER ratings the less energy consumed. . . .






(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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Part 53: Finish Phase - Sitework

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

The finish phase for this building starts with a coordinated sitework plan. The plan includes final grading, paving, landscaping, and hardscape features like planters, fencing, steps, paths, and walkways.

Hardscape and landscape
Hardscape features are usually installed by a landscape contractor along with the other landscaping. This work also includes an irrigation plan to supply the planters and outlying Xeriscape.



Interlocking modular blocks are placed to retain the soil at the planters, walkways, and steps. Planters that capture rain water and snow melt are designed to wick away moisture through weep holes or openings at the base of the retaining wall.



Permeable paving at the driveway allows moisture from rain and snow to leach through the paved areas into the ground below. When a driveway is cut into an existing grade, the surface is sloped to drain away from the house and into landscape areas that border the property.



Drainage systems are engineered according to local weather, soil type, and terrain. Local codes require run off from roofs and driveways be controlled to prevent drainage onto adjacent properties.


Depending on the drainage plan, the low point of the driveway may require a sump or trench whenever flooding is possible.



A privacy screen blocks sight lines as well as wind and rain at the entry courtyard. Note that access to the house is softened by the planters and paving at the entry.
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(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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Part 52: Overview of Finish Phase

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

The finish phase for this house includes the sitework, insulation, wall board, furnishings, cabinets, and mechanical, electrical, and plumbing (MEP) fixtures and trim. From the start of this phase, contaminants, flammables, and smoking are no longer allowed in the building.

The Finish Phase seals the walls

The sequence of the work varies according to site conditions, contractor availability, and the specified interior details. To prevent conflict or damage while the sitework is underway, staging areas and pathways are marked for subcontractor access.

When all work within the wall cavities is complete, insulation is installed to seal the frame and the walls.

Wall board installation includes a variety of types of drywall, plaster, cement boards, tile, paneling and trim. Furnishings include shelving, flooring, baseboards, mirrors, crown molds, stairs, rails, and related finished carpentry.

The cabinets are installed over primed or painted surfaces. At the same time, MEP fixtures and trim are fitted and tested. These include electrical equipment, outlets, lights, wall plates, as well as hot water heaters, sinks, control knobs, and water closets.

After inspection, final power and water are hooked-up by the public utility companies. Testing and operational checks begin once the contractors have finished and the building is cleared of debris and cleaned for occupancy.

Why a construction model ?

A 3D design model illustrates a static concept. A 4D building information model (BIM) is put together to publish and print a set of specifications, 2D contract documents, and material takeoffs.

A construction model is a piece-based assembly used to simulate a dynamic process. It animates site utilization, resource planning, site safety, staging, falsework, scaffolding, and of course the sequence of construction.

As a construction model, it is a hands-on tool that can be annotated or streamed as video delivered to the jobsite as an interactive virtual environment. The result bypasses the printed page to deliver proprietary project information throughout the construction process.

(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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Part 51: Completing Electrical Rough-In

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

A licensed electrical contractor calculates anticipated loads and installs the correct circuit breakers in the service panel according to local electrical codes. Important is that these calculations are based on information provided by the building’s owner or operator and must be accurate.

That said, most of the wiring for a residential structure is standard. Exceptions include computer and entertainment centers, kitchen and laundry areas, and local fire and safety requirements.

Sizing the system Wiring and breaker sizes vary with load requirements for each fixture and the potential accumulated loads for the branch circuits. The breakers use electromagnetic contacts or heat to sense overloads. This includes ground fault interrupters, arc faults, and high and low voltage fuses.

Service equipment like water heaters, HVAC systems, fans, and outside motor controllers require a single dedicated circuit to match manufacturer specifications.

Separate disconnect switches are placed at all inside and outside motor controllers to ensure technicians have local control of the power shut off.

Final review of the systemOnce all the wiring is in place and junction boxes are mounted and secured, the walls and ceiling are ready to receive insulation.

This work begins with a final check of the rough-in for the plumbing supply, drain and vents lines, the HVAC ducts, service lines, and the electrical wiring.

In some jurisdictions, authorization is required from a building inspector because once the insulation is in place, many systems will no longer be visible.

Items to check after the mechanical, electrical, and plumbing (MEP) rough-in are complete include:

• Interior walls inspected for proper framing sizes, tie downs, and connections

• Fire blocking as required at all frame penetrations

• Nail guards installed to protect wires and pipes at studs and joists

• Hangers, nailers, and supports for rails, fixtures, cabinets, piping, and wall fixtures

• Gate and back-flow valves in place for pressure testing

• Flood test drain pipes and pressure test water tubing and gas supply lines

• Gas and water shut off valves at all stub outs

• Vent ducts to outside air for dryer, bathrooms, and kitchen to prevent indoor air contamination

• Control wiring to fan coils and thermostats protected from damage

• Service feed and circuit breakers in place with wires run to all electrical boxes per local code

• Arc and ground fault receptacles ready for installation on circuits per local codes

• Non-metallic coated wiring of the appropriate gauge, stapled and protected

• Panel breakers mapped and labeled by the electrician at the panel

• Smoke and security detector wiring at the correct ceiling locations • Interior wall cavities swept clean and dry

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(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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Part 50: Receptacles and Lights

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

The power entering the building from the utility main is an alternating current. Standard connections use one hot, one neutral or return path wire, and a bare copper ground wire.

Receptacles deliver power to portable fixtures
In theory the hot and neutral wires can be switched and the power will flow, but it is important to keep them in phase because ground and neutral wires run back to the same connection within the panel.

The ground wire adds a safe path back to the grounding rod buried near the service connection.

Ground fault interrupt circuits (GFIC) are required for kitchen, bathroom, and outdoor weatherproof outlets. GFIC prevent electrical shock by monitoring the current flow from the hot to neutral wires. Any imbalance is sensed and the circuit is shut off.

Note that in many jurisdictions arc fault interrupters are also installed at the panel to sense shorts in electrical cords and fixtures on the branch circuits.

Control switches for lights and fixtures
The breaker sizes for receptacle circuits are estimated by the user and the electrician according to anticipated use. Computers and peripheries complicate the calculations, but too much supply can be as bad as too little.

Branch wiring runs from the service panel through the wall and floor framing to the electrical boxes. Lights and fixtures are wired on separate branch circuits.

Lights closer to the panel are wired directly and controlled with a switch loop, see www.electrical-online.com. These loops can be wired in series, or wired to respond to individual switches.
Steel plates protect wires from possible damage. Electrical boxes are checked to make sure they are secure and shielding is added near any electronics to prevent possible interference.

The finished fixtures and plates are stored offsite by the electrician and mounted after the drywall and painting are complete.

As we’ll see later, the electrician tests and certifies the installation after the finish work is complete. No power enters the building without his or her certification.    




(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.