Prefabricated roof trusses frame most new single-family homes built in North America. Instead of cutting rafters on site, builders order engineered assemblies that arrive ready to lift into place. The choice shapes the entire schedule: how fast the house gets dried in, how much attic space the design allows, and what the floor plan can do underneath. Trusses also shape how lumberyards and building material suppliers organize their businesses, because most builders buy them through the same dealers that deliver studs, sheathing, and siding. That relationship matters whether the project sits on a suburban infill lot or in one of the secluded western Michigan towns on Lake Michigan, where seasonal construction schedules put a premium on reliable deliveries.
Custom roof trusses are engineered for a specific house rather than pulled from a stock catalog. A truss plant takes the roof plan, engineers every member, fabricates the assembly, and delivers it with placement marks that tell the crew exactly where each piece goes. This article walks through how those trusses are designed, built, priced, and installed, and what builders should check when ordering through a lumberyard or directly from a plant.
How Roof Trusses Shape Residential Design
A roof truss is a triangulated frame of lumber members connected by galvanized steel connector plates. The triangular geometry lets a light frame carry loads that would require much heavier solid timbers, which is why the truss became the default roof structure for residential construction after World War II. Industry estimates put prefabricated trusses on roughly three quarters of new houses in the United States, and the share runs higher in markets with long winters, where crews want the house under cover quickly.
Trusses change what is possible inside the house. A common truss spans 30 to 40 feet with no interior bearing wall, which opens up great rooms, kitchens, and walkout basements. Scissor trusses produce a vaulted ceiling while still carrying the roof load. Attic trusses create a floored room above the garage or over a bonus space. Even distinctive projects, including lakeside home design work along Lake Michigan, depend on engineered trusses to reach the open spans and rooflines clients ask for.
How a Truss Carries a Roof Load
Every truss has three jobs: transfer the weight of the roof covering and snow to the exterior walls, resist wind uplift, and hold its own members in place. The top chords form the roof slope and take compression. The bottom chord acts as a tie that resists the outward push of the rafters. Webs between the chords divide long members into shorter ones and move loads to the joints, where the steel plates grip the lumber. That load path explains why field modifications are dangerous: cutting or notching a chord changes the math the engineer ran, and a truss altered on site no longer matches its approved design.
Truss Profiles at a Glance
- Common (Fink) truss: the workhorse profile for simple gable roofs, with a W-shaped web pattern.
- Scissor truss: slopes the bottom chord to create a cathedral ceiling.
- Attic truss: builds in a floored room with full-height side walls.
- Hip truss: used where two roof slopes meet at a corner of the building.
- Mono truss: a single-slope member for sheds, additions, and lean-to sections.
Why Building Materials Suppliers Keep Consolidating
The truss business has consolidated steadily for two decades, and the pace picked up after 2020. Lumberyards buy truss plants to control their own supply of engineered components, and truss manufacturers buy smaller competitors to widen their territory. The pattern is not unique to framing. The power tool industry acquisitions of recent years, including Kyocera’s purchase of a majority stake in Ryobi’s power tool business, follow the same logic: larger companies buy product lines and distribution instead of building them from scratch.
A regional example shows how these deals play out. MANS Lumber & Home, a family-owned supplier based in Trenton, Michigan, acquired Michigan Timber & Truss, a custom roof truss manufacturer in Flint, in December 2024. The purchase followed MANS acquisitions of Dillman & Upton in 2021 and Kurtis Builder Supply in 2024. Michigan Timber & Truss keeps its name and its 18-acre, 80,000-square-foot plant while gaining access to MANS distribution across southeast Michigan. For builders in the Detroit metro area, the practical result is one supplier that can deliver lumber, trusses, and related materials on the same truck.
What Vertical Integration Changes for Builders
- Shorter lead times, because the truss plant and the lumberyard answer to the same company.
- A single invoice and delivery schedule for the framing package.
- Engineering support from the team that supplies the materials.
- More predictable pricing when lumber markets swing.
Signs a Supplier Is Investing in Manufacturing
Ask whether the yard owns its truss plant or resells another manufacturer’s product, how many trusses it can produce in a shift, and whether it offers in-house design review. Suppliers that invest in plants, software, and trained engineers are the ones that hold up when demand spikes.
Types of Roof Trusses for Residential Projects
Residential projects choose among a handful of profiles, and the right pick depends on span, roof pitch, snow load, and what happens inside the building envelope. The table below summarizes the most common options and where each fits.
| Truss profile | Typical span | Best use |
|---|---|---|
| Common (Fink) | 20-40 ft | Gable roofs, simple spans, most production homes |
| Scissor | 16-30 ft | Vaulted ceilings in living and family rooms |
| Attic | 20-32 ft | Bonus rooms and storage over garages |
| Hip | 12-30 ft | Hip roofs and corners where slopes meet |
| Mono | 8-24 ft | Additions, porches, and shed roofs |
Truss manufacturers publish load tables for each profile, and most plants use design software that generates the layout automatically. The machinery used to fabricate these profiles comes from an equipment sector that has consolidated quickly, mirroring moves in the compact construction equipment market, where manufacturers buy rival product lines to fill out their catalogs.
Reading a Truss Specification
A truss drawing lists the span, pitch, heel height, lumber grade, connector plate size, and the design loads used for the calculation: dead load, live load, and snow load. Builders should confirm that the drawing matches the approved house plans before fabrication starts. A change after cutting wastes material and time, and a mismatch between drawing and field conditions surfaces at the worst moment, when the crane is already on site.
How Custom Trusses Are Designed and Manufactured
Custom truss production starts with engineering. The plant takes the builder’s roof layout, runs it through design software, and produces shop drawings that show every member, plate, and dimension. Licensed engineers review the output, and the drawings come back to the builder for approval before any lumber is cut. That review step is where errors get caught, and rushing it is the most common mistake in truss ordering.
At the plant, lumber is graded, cut to length, and laid out on jig tables. Presses drive galvanized steel plates into both faces of every joint, and the finished truss is inspected for member damage, plate placement, and dimensional accuracy. The Flint facility that MANS acquired has run this process since 1956, and the core workflow has changed little as software and presses got faster. The economics explain why regional scale matters: a plant serves a radius of roughly 150 to 250 miles because hauling long assemblies is expensive and many states restrict oversized loads. The same logic that drives strategic growth in pavement maintenance, where service companies acquire local operators to widen coverage, applies to trusses. Builders benefit when their supplier’s plants sit close to the job site.
The Design-to-Delivery Workflow
- Send roof plans and floor plans to the truss supplier.
- Receive shop drawings and load calculations for review.
- Approve the drawings, including any changes to roof pitch or overhangs.
- Schedule fabrication, typically one to three weeks out.
- Arrange delivery with a truss trailer and a crane or lift crew.
- Inspect on arrival and match bundle tags to the drawings.
Quality Checks at the Plant
Look for plants that grade lumber on arrival, calibrate presses daily, and spot-check finished trusses against the approved drawings. Ask about their reject rate and warranty process. A plant that shows you its inspection log usually keeps its promises.
Cost, Lead Times, and Ordering Through a Lumberyard
Truss pricing depends on span, pitch, lumber prices, and complexity. A simple common truss for a 30-foot span might run $75 to $150 delivered, while scissor and attic trusses cost more because they use more lumber and plates. Prices track framing lumber markets, so builders usually lock in quotes at contract time and pay the difference if lumber moves before delivery. Many lumberyards fold truss pricing into the framing package, which is why distribution matters: buyers compare quotes, and suppliers that control their own plants can sharpen their pencils. The same pattern shows up in tools, where flooring equipment consolidation has changed how contractors buy machines and blades.
Budgeting for a Truss Package
- Framing lumber and plates make up most of the cost; longer spans and steeper pitches add material.
- Delivery and crane time can add $300 to $1,000 per job depending on distance and access.
- Design and engineering fees are often included in the quote, but confirm that in writing.
- Lead times stretch in spring and summer, so order four to six weeks ahead in peak season.
What Moves the Schedule
Plant backlog, lumber availability, and drawing approval time all affect lead time. A job that waits three days for builder approval pushes every downstream step, so return reviewed drawings the same day you receive them. Wet ground can delay the crane, so schedule delivery against the forecast rather than the calendar.
Choosing a Truss Supplier for the Long Term
The supplier decision comes down to engineering support, plant capacity, delivery radius, and price. Visit the plant if you can, ask to see the design software and the press line, and get references from builders who have used it for more than one season. Confirm that every truss is labeled with the job number and placement code, because that labeling is what makes field installation straightforward.
Consolidation keeps redrawing who builds what. The same forces that put truss plants inside lumberyard companies are reshaping other corners of the supply chain, from cold-chain workwear and construction safety suppliers to the distributors that move hardware and fasteners. For builders, the practical takeaway is to build relationships with suppliers that control their own manufacturing, because those are the ones that hold schedules when the market tightens. A truss package is a small part of the house by dollar value and a large part by risk, and the supplier deserves the same scrutiny as the foundation contractor.