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Structural Reference — Confidential

Load Capacity & Base Plate Data

Complete structural tables for wall-mounted bracket systems, floor-mounted post capacity, and base plate performance. Derived from manufacturer tested loads and USDA Wood Handbook (FPL-GTR-190). For professional specification use only.

Portal exclusive — not publicly accessible

Wall-Mounted Brackets

System Load Capacity — Bracket × Wood × Spacing

Each cell = governing system capacity (lesser of bracket tested load and rail bending capacity at that span). Green = bracket governs. Amber = rail governs — specify 2" diameter to restore full bracket rating.

Green — bracket is the limit; full rated capacity delivered

Amber — rail bends first; upgrade to 2" diameter

Grey — spacing exceeds bracket maximum

Scroll right to see all spacings

Bracket	Tested Load	32" Bracket Spacing bracket governs all species					48" Bracket Spacing critical zone — check species					60" Bracket Spacing 2" rail recommended
Bracket	Tested Load	1⅝" Red Oak	1⅝" Ash	1⅝" Maple	2" Red Oak	2" Maple	1⅝" Red Oak	1⅝" Ash	1⅝" Maple	2" Red Oak	2" Maple	1⅝" Red Oak	1⅝" Ash	1⅝" Maple	2" Red Oak	2" Maple
Rail bending capacity (lbs) →		377	395	416	702	776	251	263	277	468	517	201	211	222	374	414
Wall-Mounted Brackets — Commercial
Sissone	250 lbs	250	250	250	250	250	250	250	250	250	250	201	211	222	250	250
Pirouette	270 lbs	270	270	270	270	270	251	263	270	270	270	201	211	222	270	270
Fusion	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Warrior I	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Cabriole Single	350 lbs	350	350	350	350	350	251	263	277	350	350	201	211	222	350	350
Cobra	350 lbs	350	350	350	350	350	251	263	277	350	350	201	211	222	350	350
Doubler en Lair double	250 lbs	250	250	250	250	250	250	250	250	250	250	201	211	222	250	250
Cabriole Double	350 lbs	350	350	350	350	350	251	263	277	350	350	201	211	222	350	350
Floor-Mounted Brackets — Commercial
Classix Single	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Frappé Single	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Attitude	350 lbs	350	350	350	350	350	251	263	277	350	350	201	211	222	350	350
Brisé Single	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Classix Duo double	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Frappé Double double	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Brisé Double double	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Classix Fit triple	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Frappé Triple triple	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Brisé Triple triple	300 lbs	300	300	300	300	300	251	263	277	300	300	201	211	222	300	300
Wall-Mounted Brackets — Home Use Only (max 36" spacing)
Core	150 lbs	150	150	150	150	150	—	—	—	—	—	—	—	—	—	—
Petite Core	150 lbs	150	150	150	150	150	—	—	—	—	—	—	—	—	—	—

All values in lbs. At 32" spacing, bracket rating governs for all species and diameters. At 48" spacing, the 1⅝" rail governs with brackets rated 270 lbs+ — specify 2" diameter to restore full bracket capacity. At 60" spacing, the 1⅝" rail governs for all brackets — the 2" rail unlocks full capacity across all species.

Floor-Mounted Brackets

Post Capacity by Height & Spacing

Preliminary design reference for floor-mounted 1‑5/8" steel posts. Estimated lateral load capacity depends on post height, bracket spacing, base plate size, anchorage, and proper installation into adequate structural substrate. Values are proportional design estimates derived from the 42" baseline and assume consistent material, section properties, base connection, and installation conditions.

Post Height	32" Spacing	48" Spacing	64" Spacing	Recommended Base Plate
36"	~438–554 lbs	~292–350 lbs	~219–263 lbs	4×4" min · 5×5" preferred
38"	~414–525 lbs	~276–332 lbs	~208–249 lbs	4×4" min · 5×5" preferred
40"	~394–499 lbs	~263–315 lbs	~197–236 lbs	5×5" recommended
42"	~375–475 lbs	~250–300 lbs	~188–225 lbs	5×5" to 6×6" recommended

Design estimates for steel post capacity only — does not account for rail bending. Cross-reference with the wall bracket table above for full system capacity. Load ranges reflect variation across bracket models. Not a substitute for project-specific engineering review.

Base Plate

Base Plate Performance Comparison

A larger base plate does not make the steel post stronger — it improves the stability of the floor connection by increasing bearing area and allowing wider anchor spacing. This helps reduce rocking, improve resistance to rotation, and distribute force more effectively into the floor.

Base Plate	Plate Area	Area vs 4×4"	Approx. Anchor Spread	Spread Increase	Relative Stability
4" × 4" baseline	16 sq in	—	2.5"	—	Baseline
5" × 5"	25 sq in	+56%	3.5"	+40%	~+40%
6" × 6"	36 sq in	+125%	4.5"	+80%	~+80%

Key spec note: Specify 5×5" or 6×6" for any commercial or studio installation where rocking, vibration, or repeated dynamic loading is expected. The 4×4" minimum is for residential only. For concrete slab, specify 6×6" to maximize anchor embedment geometry. Final capacity also depends on slab condition, anchor type, embedment depth, plate thickness, weld details, and applied load height.

Data sources

Rail bending capacity: USDA Forest Products Laboratory, Wood Handbook — Wood as an Engineering Material, FPL-GTR-190 (Centennial Ed. 2010 / revised 2021), Table 4-3a. MOR: Hard Maple 15,800 psi · White Ash 15,000 psi · Northern Red Oak 14,300 psi. Safety factor 2.0. Formula: P_allow = 2 × MOR × S / L, S = πd³/32.
Bracket load ratings: Custom Barres manufacturer tested specifications.
Floor post capacity: Proportional design estimates from 42" baseline; assumes consistent section properties and compliant installation.
Base plate data: Geometric analysis — bearing area and anchor spread derived from plate dimensions.

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System Load Capacity — Bracket × Wood × Spacing

Post Capacity by Height & Spacing

Base Plate Performance Comparison

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System Load Capacity — Bracket × Wood × Spacing

Post Capacity by Height & Spacing

Base Plate Performance Comparison

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