How panelized construction worksFrom drawings to weather-tight in five steps

MBS moves the framing and enclosure work from the lot to our St. Louis plant. Panels are built while your foundation goes in, then set and closed in days, not weeks. The result is a 50% quicker construction schedule.

Illustration of a two-story MBS panelized home with its wall, floor and roof panels pulled apart

Panelized construction guide

What is panelized construction?

Panelized construction is conventional wood framing built in a factory. Wall panels and floor cassettes are cut on CNC equipment, closed with insulation, windows, doors, cladding and MEP rough-in, shipped flat on standard trucks and set on a foundation in days. The result is a stick-built building, not a modular box or a manufactured home.

What ships
Panelized (MBS): Flat wall panels and floor cassettesModular: Finished 3D room boxes
Transport
Panelized (MBS): Standard flatbed and step-deck trucksModular: Often oversize loads with permits and escorts
Design freedom
Panelized (MBS): Cut to your drawings, no box sizeModular: Limited by module width and height for shipping
Inspection and financing
Panelized (MBS): Conventional wood framing to the adopted codeModular: Often state modular program and seals

The process

Five coordinated steps. One factory price.

  1. 01

    Design

    Your drawings or ours

    Send permit-ready plans, or let our in-house architectural designer start from a survey and lot dimensions. Every project is modeled in BIM.

  2. 02

    Estimate

    Fixed price, valid 30 days

    We price your plans and return a fixed factory price. Freight within the 1,000-mile service area is in the number.

  3. 03

    Manufacture

    While your foundation goes in

    After permit approval, panels are CNC-cut, framed, insulated and closed with windows, doors, cladding and MEP rough-in to the agreed scope.

  4. 04

    Deliver

    Standard trucks

    Panels ship vertically or flat-packed on standard flatbed and step-deck trucks. No wide loads, no escorts.

  5. 05

    Install

    Weather-tight in days, not weeks

    Our crew or your GC sets the panels on your foundation. Interior trades start in a dry, enclosed building.

Your production slot, delivery date and install sequence are confirmed at contract.

Inside the plant

One model drives every cut

Your building lives in one BIM model. Assembly drawings and CNC shop drawings come straight from it. More than $2 million in automated CNC equipment cuts within 1/16 in., so what we cut is what you approved.

  1. 1BIM model
  2. 2Assembly drawings
  3. 3CNC shop drawings
  4. 4Cut and frame
  5. 5Close, load and ship
The CNC crosscut saw that cuts framing members to within 1/16 in. at the MBS plant in St. Louis
CNC crosscut saw
The multi-bridge router head that cuts window and door openings in sheathed wall panels at the MBS plant
Multi-bridge
A framed wall panel at an MEP station in the MBS plant, where windows, siding and MEP rough-in are installed
MEP racks

Build packages

Choose the scope that fits your project

From subcomponents for your framer to a single turnkey contract. MBS can tailor materials, finishes and the level of completion to your specification.

For framers and GCs

Framing only

Just the factory framing. CNC-cut subcomponents and open framed wall panels, built to your drawings. Your crew sheathes, closes and finishes on site.

  • Subcomponents: door legs, headers, stud packs, channels, Els
  • Open framed wall panels with coordinated openings
  • Buy only the pieces your crew needs
Structural start

Sheathed panels

CNC-cut, framed and sheathed wall panels, roof panels and floor cassettes. Your team insulates, closes and finishes on site.

  • CNC-cut framing
  • Structural sheathing
  • Wall panels, roof panels, floor cassettes
Standard closed package

Panels only

Sheathing, WRB, insulation, air barrier, windows, doors, cladding and MEP rough-in are factory-installed. MBS or your GC sets the panels, and interior-finish trades follow.

  • Everything in sheathed
  • Mineral wool insulation, R-23 walls
  • Windows, doors and cladding
  • MEP rough-in
  • Rothoblaas air and vapor control
One coordinated contract

Turnkey

MBS contracts and subcontracts the build from start to finish. One contract, one schedule, one point of contact.

  • Everything in standard
  • Site work and installation coordinated by MBS
  • Inclusions set in your agreement

By agreement, foundations, site work, utilities and interior finishes are excluded unless included in a turnkey scope. Request the written warranty with your estimate.

For GCs and framers

Buy the factory work your job needs

Choose individual assemblies or combine a wall, floor and roof package. Your crew sets, connects and completes the building.

  1. The CNC subcomponent nailer that builds headers, door legs and stud packs at the MBS plant in St. Louis
    01

    Subcomponents

    Preassembled door legs, headers, stud packs, channels, Els and repeat assemblies.

  2. Open framed wall panels with window and door openings, racked at the MBS panel plant in St. Louis
    02

    Framed wall panels

    Open wall frames with coordinated openings and agreed backing.

  3. A sheathed wall panel on the roller line at the MBS panel plant in St. Louis, MEP stations behind
    03

    Sheathed wall panels

    Wall framing plus specified structural sheathing. Added enclosure layers are scoped separately.

  4. Prefabricated floor cassettes stacked and ready to ship at the MBS plant in St. Louis
    04

    Floor panels

    Coordinated floor framing with the selected joist system and decking where specified.

  5. Prefabricated roof panels with OSB decking stacked at the MBS plant in St. Louis
    05

    Roof panels

    Roof framing with decking where specified. Remaining roof layers are scoped separately.

  6. A closed MBS wall panel with a factory-installed window, weather barrier and furring strips
    06

    Closed panels

    Agreed insulation, enclosure layers, windows, doors, cladding and MEP rough-in.

Approved drawings and the written quote govern inclusions, factory layers and field interfaces.

The MBS Standard Wall

Seven layers, R-23 above grade

Our standard closed-panel package combines 2×6 exterior framing, mineral wool insulation, and Rothoblaas tapes and membranes. An MBS home achieved HERS 42, a project result, not a rating for every design.

Mineral wool is non-combustible, moisture resistant and made with up to 70% recycled content. The Rothoblaas membranes and tapes are Passive House Institute certified and applied in the factory.

We build to your spec
Exploded view of the MBS Standard Wall, exterior to interior: fiber cement lap siding, weather-resistive barrier, OSB sheathing, 2×6 stud frame, mineral wool batts, an air and vapor control membrane with taped seams, and Type X gypsum
Exterior (1) to interior (7). Layers are pulled apart to show the assembly; in the panel, mineral wool fills every stud cavity. Illustration, not to scale.
#LayerSpecification
1Exterior claddingFiber cement lap siding (James Hardie), LP SmartSide or your specified finish
2Weather-resistive barrierFluid-applied WRB, ZIP System or house wrap, per design
3Structural sheathing7/16 in. OSB or 19/32 in. plywood
4Exterior framing2×6 kiln-dried SPF, 16 in. on center, CNC-cut
5Cavity insulationMineral wool, full cavity, installed in the factory
6Air and vapor controlRothoblaas membranes and tapes
7Interior gypsum5/8 in. Type X, hung in the factory

Assembly performance targets

R-23
Effective R-value, above-grade walls
< 0.25 ACH50
Air leakage on a blower-door test
STC 50+
Sound rating with 5/8 in. gypsum
1 hour
Fire rating with Type X gypsum
ASCE 7
Wind loads engineered to ASCE 7 and local code
HERS 42
Achieved on a completed MBS home

Published targets from the MBS Builder Kit. Assembly specifics change with climate zone, code and design, so treat them as typical. Your drawings and written quote govern.

Built to your specifications

The MBS Standard is our baseline, not a limit.

We build to client specifications. Tell us what the project needs and we engineer, price and build it on the same CNC line.

Send us your specs
  • Your needsThe design, use and site conditions of your project.
  • Your materialsThe quality level and products you specify, including builder-grade options.
  • Your build requirementsEnergy, fire, acoustic and code targets set by your project, lender or program.

Final materials and assemblies are set in your written quote and approved drawings.

Wall panels shipped upright on a flatbed truck and lifted off by crane at the job site

Delivery and install

Standard trucks. Weather-tight in days, not weeks.

  • Ships flat or verticalRacked upright on A-frames or flat-packed on standard flatbed and step-deck trucks. Loads stay within legal limits, 8 ft 6 in. wide and 13 ft 6 in. high, so there are no wide-load permits and no escorts.
  • 1,000-mile service areaAcross the Midwest, Mid-South and Plains. Freight is priced in your estimate.
  • Our crew or yoursMBS installs, or works with your GC and framer. An installer program for GCs is in development.
  • Inspected as conventional framingBuilt to the adopted code of your jurisdiction. In Missouri our panels are inspected as conventional wood framing; in St. Louis the City inspects them in our factory and again on site. Drywall stays off at panel edges, tops and bottoms so every connection can be seen. Your foundation is completed to MBS tolerances before delivery.

Start a project

Send your plans. Get a fixed factory price.

Permit-ready drawings and a site address are all we need. Your estimate is valid for 30 days and includes freight within 1,000 miles.

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