Build a Pair of Heavy-Duty Sawhorses

A. Finished-Project Specification

Quantity: one matching pair (two units) of fixed, trestle-style heavy-duty sawhorses, each 36 in. long, 24 in. wide, and 30 in. tall, intended to support lumber, sheet goods, doors, and ordinary construction assemblies. The sawhorses are not scaffolds, steps, ladder supports, vehicle stands, lifting stands, seating, or equipment for supporting people.

B. Component Schedule (One Pair)

Component	Quantity	Material	Finished Size	Preparation
Top rails	2	Straight 2×6	36 in.	Square ends, cut per Project 03 method
End crossbars	4	Straight 2×4	24 in.	Square ends, cut per Project 03 method
Legs	8	Straight 2×4	28 1/2 in.	Square ends, cut per Project 03 method
Side stretchers	4	Straight 2×4	30 in.	Square ends, cut per Project 03 method
End-frame gussets	8	1/2-in. exterior plywood	8 × 10 in. right triangles	Edges eased; cut from the supplied panel layout
Diagonal side braces	4	Straight 1×4	36-in. blanks	Cut to fit after end frames and stretchers are squared
Stretcher bolts	8	5/16-in. carriage bolts	4 in.	With washers and locknuts
Structural screws	as scheduled	Exterior structural wood screws	3 in.	Installed with the approved driver bit
Gusset and brace screws	as scheduled	Exterior wood screws	1 5/8 in.	Installed with the approved driver bit

C. Material Takeoff

• 2×6 stock: sufficient straight stock for two 36-inch top rails, plus at least 20 percent practice and recut allowance.
• 2×4 stock: sufficient straight stock for four 24-inch end crossbars, eight 28 1/2-inch legs, and four 30-inch side stretchers per pair, plus at least 20 percent practice and recut allowance.
• 1×4 stock: four 36-inch diagonal-brace blanks, cut to fit after squaring.
• Plywood: one supplied panel layout sufficient for eight matching 8-by-10-inch right-triangular gussets.
• Fasteners: eight 5/16-inch carriage bolts with washers and locknuts; 3-inch exterior structural screws and 1 5/8-inch exterior wood screws per the joint schedule in Section D.
• Waste allowance: stage extra 2×4 and 2×6 stock beyond the minimum needed to allow for recuts identified during the Project 03 tolerance check in Step F-10.

D. Controlled Joint Schedule

Joint	Fastener or Hardware	Quantity per Joint	Installation Requirement
Leg to end crossbar	3-in. exterior structural screws plus one plywood gusset	2 screws direct, plus minimum 6 gusset screws	Screws driven without splitting; gusset seated flat and fully screwed in the supplied pattern
Stretcher end to leg	5/16-in. carriage bolt, washer, locknut, plus one anti-rotation structural screw	1 bolt and 1 screw per stretcher end	Bolt tightened without crushing the wood; anti-rotation screw installed to prevent stretcher rotation
Top rail to end crossbar	3-in. exterior structural screws	3 screws per crossbar	Top centered with equal side overhang before driving
Plywood gusset	1 5/8-in. exterior wood screws	Minimum 6 screws per gusset	Installed in the supplied pattern without overdriving
Diagonal brace	1 5/8-in. exterior wood screws	Minimum 3 screws at each end	Installed in the supplied pattern after the brace is cut to fit and clamped in place

E. Acceptance Standards

Check	Standard
Overall dimensions	Length, width, and height within ±1/8 in. of the specified 36 × 24 × 30 in.
Pair height	Difference between the two finished sawhorses not more than 1/8 in.
End-frame square	Both legs parallel and perpendicular to the crossbar, verified per the Project 02 method
Top level	Top centered and level across its width
Foot contact	All four feet contact a verified flat floor with no rocking
Stretcher elevation	Stretchers level and at matching elevations on both sides
Fastener condition	No unintended split lumber, crushed fibers, stripped screws, or loose bolts; washers seated and locknuts fully engaged
Bracing	Braces and gussets fully seated with the correct screw pattern; no visible racking under a firm hand-applied material-support stability check
Pair consistency	A straight reference board laid across both sawhorse tops contacts both without rocking

F. Preparation — Stock Selection, Cutting, and Layout

1. Review the complete drawing, component schedule, joint schedule, and inspection standard before cutting. Confirm every dimension in Sections B and D before touching the saw.
2. Select straight stock and reject severe bow, twist, splits, loose knots, decay, or damaged ends. Inspect every board per the Project 03 method before marking a reference face and edge.
3. Mark one reference face and edge on every board. Keep this mark visible through every subsequent layout and cutting operation.
4. Cut two 36-inch 2×6 top rails. Use the Project 03 measuring, marking, and cutting sequence.
5. Cut four 24-inch end crossbars. Verify each cut square within the Project 03 tolerance before proceeding.
6. Cut eight 28 1/2-inch legs. Compare all eight directly for matched length.
7. Cut four 30-inch side stretchers. Compare all four directly for matched length.
8. Cut four 36-inch 1×4 diagonal-brace blanks. Do not trim these to final length yet; they are cut to fit during Assembly Step 19.
9. Cut eight matching 8-by-10-inch right-triangular plywood gussets from the supplied panel layout. Ease all cut edges before labeling.
10. Compare all matched components and recut any piece outside the Project 03 tolerances. Set aside every piece that fails before continuing.
11. Label all first-sawhorse components A and all second-sawhorse components B. Keep the two labeled sets physically separated on the material zone shelving.
12. Mark the leg locations on every crossbar so each leg's outside face is 1 1/2 inches in from the crossbar end. Measure from the reference end on each crossbar.
13. Mark the stretcher top-edge line 10 inches above the bottom of every leg. Measure from the same reference end used on each leg.
14. Mark controlled fastener and bolt locations using the supplied drilling template. Apply the template identically to the A-set and B-set components.

G. Assembly — First End Frame (Repeat for Second End Frame)

1. Place the first 24-inch crossbar on edge on the flat assembly surface. Orient its reference face outward per the drilling template.
2. Position two legs against the controlled face of the crossbar with their upper ends flush with the crossbar top and their outside faces on the 1 1/2-inch inset marks. Confirm both legs sit on the marked inset before clamping.
3. Clamp the first end frame and verify both legs are parallel and perpendicular to the crossbar. Use the framing square and combination square per the Project 02 verification method.
4. Drill the required pilots and install the two structural screws at each leg-to-crossbar joint. Drive both screws per Joint Schedule Section D without splitting the leg or crossbar.
5. Position one plywood gusset over each joint using the supplied edge offsets. Align the gusset before marking its screw pattern.
6. Install the gusset screws in the controlled pattern without overdriving. Confirm a minimum of six screws per gusset, fully seated and flush.
7. Repeat Steps 1–6 to build the second matching end frame. Compare the two completed frames directly for matched leg spacing and square before continuing.

H. Assembly — Stretchers, Top Rail, and Level Check

1. Stand the two end frames upright with their controlled faces oriented correctly and their inside leg faces 30 inches apart. Measure the 30-inch inside spacing at both the top and bottom of the legs before clamping.
2. Position the first 30-inch side stretcher between the legs with its top edge on the 10-inch line. Confirm the top-edge line matches on both end frames.
3. Clamp the stretcher, verify it is level, and drill the controlled through-holes square to the joint. Use the level per the Project 02 verification method before drilling.
4. Install one carriage bolt, washer, and locknut at each end and tighten without crushing the wood. Stop tightening once the washer is fully seated against the wood surface.
5. Install the specified anti-rotation screw at each stretcher connection. Drive one structural screw at each stretcher-to-leg joint per Joint Schedule Section D.
6. Repeat Steps 2–5 for the opposite side stretcher. Confirm both stretchers are level with each other before continuing.
7. Measure the partial assembly diagonally and adjust until square within 1/8 inch. Compare both diagonals across the open frame before proceeding.
8. Center the 36-inch top rail over both crossbars with its ends flush to the overall 36-inch length. Confirm equal overhang on both sides before clamping.
9. Clamp the top, verify equal side overhang, and install three structural screws into each crossbar. Drive all six screws per Joint Schedule Section D.
10. Place the assembly on the verified reference floor and check all four feet for contact. Identify and correct any foot that does not contact the floor before continuing.

I. Assembly — Diagonal Braces and Final Squaring

1. Hold the first diagonal brace from the upper end-frame region to the opposite lower stretcher region as shown in the side elevation. Position the 1×4 blank across the open side of the assembly.
2. Mark the brace in place from the outside face of the first end-frame leg near the crossbar to the outside face of the opposite leg immediately above the lower stretcher, cut it to fit, reinstall it, and fasten it using the supplied pattern. Install a minimum of three 1 5/8-inch screws at each end per Joint Schedule Section D.
3. Install the second brace on the opposite long side in the opposing direction so the two braces resist racking in both directions. Confirm the second brace crosses in the opposite diagonal direction from the first.
4. Recheck square, top level, end-frame plumb, overall dimensions, joint seating, and rocking. Correct any deviation before moving to the second sawhorse.
5. Build the second sawhorse using the same sequence and setup controls (Sections F–I) with the B-labeled components. Do not begin the second sawhorse until the first passes every check in Step 4.
6. Place both sawhorses side by side and compare top height, width, length, and foot contact. Record any measured difference on the stability inspection worksheet.
7. Lay a verified straight board across both tops and check for rocking or loss of contact. Correct any gap before final inspection.
8. Correct every mismatch before completing the final inspection. Repeat the affected check after each correction.