Full duct packages
Rectangular, round, and spiral duct with fittings, transitions, and offsets taken off your drawings and tagged by area.
Sheet metal fabrication · Rancho Cordova
Custom sheet metal fabrication, cut in our own shop.
A 4,800 sq ft fabrication shop in Rancho Cordova with CNC plasma, brake presses, roll forming, and TIG welding. SMACNA duct, welded stainless hoods, and NFPA 96 grease duct built by our employees and shipped on your install date.
Interactive 3D
Sheet Metal Fabrication in 3D.
Interactive models of the equipment on this scope, drawn in code from what we install every week. Drag to rotate.
SMACNA rectangular duct with a radius elbow and TDC flanges - fabricated on our CNC line and tagged to the drawing.
What we deliver
4,800 sq ft in-house shop in Rancho Cordova. CNC plasma, brake, roll forming, TIG welding. SMACNA spec on every job. We do not outsource fabrication.
- SMACNA HVAC Duct Construction Standards (Class 1 / 2 / 3)
- Custom Fittings, Transitions, & Offsets
- Stainless Steel Welded Hoods (Type 304 / 430)
- Galvanized & Spiral Round Duct
Fab packages: $15K (single hood) to $850K (full multi-floor duct package). Lead time: 2–8 weeks depending on scope and finishes.
Full scope, process & specs
Our Rancho Cordova fabrication shop runs five days a week with two CNC plasma tables, three brake presses, a coil line, and six welding stations. Every duct, fitting, and hood that ships to your jobsite was cut, brake-formed, and welded under our roof - by our employees - to SMACNA HVAC Duct Construction Standards (4th Edition).
For restaurant work, we fabricate to NFPA 96 grease duct standards: continuous welds, liquid-tight, leak-tested at 1 inch w.c. before it leaves the shop. Type 304 stainless hoods with welded seams (no caulk, no rivets) and field-mountable filters. Health departments across California (Sacramento County, Alameda, LA County, San Diego) recognize our spec sheet on sight.
Architectural sheet metal - column wraps, soffit panels, mansard cladding, custom signage substrates - gets the same treatment. We powder-coat in-house in any RAL color, so finish color doesn't become a 6-week lead time on your schedule.
Take-off from your plans
Estimators measure off CAD or PDFs. We catch coordination conflicts (joists, sprinkler, MEP) before fabrication.
Shop drawings + submittals
AutoCAD MEP and Revit-compatible. We submit before we cut so your design team can sign off.
CNC cut + brake form + weld
Two plasma tables run continuously. Hoods welded by certified TIG operators.
QA + ship
Every weld inspected. Leak-test on grease duct. Tagged, palletized, and delivered on your install date.
- Black Iron / Welded Grease Duct (NFPA 96)
- Architectural Metal Panels & Cladding
- Industrial Exhaust Stacks & Plenums
- Custom Curbs, Hoods, & Roof Penetrations
- Powder Coat Finishing (in-shop)
- TIG / MIG Welding (Stainless, Aluminum, Mild Steel)
- Insulated Double-Wall Duct
When GCs call us for sheet metal fabrication.
Kitchen hoods & grease duct
Type 304 stainless hoods with welded seams, and black iron grease duct welded liquid-tight and leak-tested before it ships.
Custom & architectural
Curbs, roof penetrations, plenums, exhaust stacks, column wraps, and cladding, powder-coated in-house in any RAL color.
Fabrication packages
Fab is priced as its own line on every bid, so you see exactly what the metal costs. Ask the bid desk about fab-only scope for your project.
Codes & standards we build to
- SMACNA HVAC Duct Construction Standards
- NFPA 96 grease duct construction
- California Mechanical Code duct requirements
- Title 24 duct leakage limits
- HCAI seismic bracing (healthcare)
Job flow in 3D
How a sheet metal fabrication job moves.
Same six stages on every Sierra job, from takeoff to the TAB report. Scroll to walk through it; drag to look around.
- Estimating
Plans & takeoff
Budgetary number in 4 business hours. Itemized hard bid in 5 days.
DeliverablesBid · scope sheet · alternates
- Pre-construction
3D coordination
Clashes with structure and other trades are solved on screen, not in the field.
DeliverablesShop drawings · submittals · Title 24
- Rancho Cordova shop
In-house fabrication
CNC-cut, formed, and welded to SMACNA and NFPA 96. Never outsourced.
DeliverablesDuct · hoods · fittings
- Logistics
QA & delivery
Leak-tested, tagged to the drawing, and delivered on your install date.
DeliverablesTest records · tagged pallets
- Self-performed
Field install
Our own W-2 crews, with a PM in your OAC meetings every week.
DeliverablesRTU sets · rough-in · look-ahead
- Turnover
Start-up & closeout
Start-up, NEBB/AABC test and balance, O&M manuals, and as-builts.
DeliverablesTAB report · O&M · as-builts
Sheet Metal Fabrication questions.
Does Sierra Mechanical outsource any sheet metal fabrication?
No. Every duct, fitting, and hood is cut, formed, and welded in our Rancho Cordova shop by our own employees. That is how we control quality, lead time, and cost.
What equipment is in the fabrication shop?
Two CNC plasma tables, three brake presses, a coil line, roll forming, and six TIG and MIG welding stations for galvanized, stainless, aluminum, and mild steel.
What are typical lead times for fabricated ductwork?
Two to eight weeks depending on scope and finish. A single hood package is on the short end; a full multi-floor duct package with powder coat is on the long end.
How are fabrication packages priced?
Fabrication is itemized on its own line, from a single hood around $15K to full multi-floor duct packages around $850K, delivered tagged and palletized to your site. Ask the bid desk about fab-only scope.
Next step - takeoff & budgetary pricing
Bidding sheet metal fabrication? Send the plans.
Budgetary number in 4 business hours. Itemized hard bid in 5 business days. One PM from takeoff to closeout.