PSL vs Timber Columns: Load Capacity and Cost Comparison
Columns seem simple, vertical member, axial load, done. But the product you choose determines how much load a given cross-section can carry, how it looks, and how much it costs. Here's the real comparison.
The Numbers
At a standard 8-foot height, here's what a 5-1/2" × 5-1/2" section can carry:
- Douglas Fir #1 (6×6 actual 5.5"×5.5"): Approximately 25,000-30,000 lbs depending on grade and duration of load factor.
- PSL 2.0E (5-1/4"×5-1/4"): Approximately 45,000-55,000 lbs. Significantly higher due to the higher Fc value and more consistent material properties.
That's roughly 1.5-2x the capacity for PSL at a similar cross-section. But PSL also costs 2-3x per linear foot.
When PSL Makes Sense
- High loads in tight spaces: When you need maximum capacity from minimum cross-section. Multi-story stacking, garage headers with posts, and transfer conditions.
- Concealed conditions: Posts buried in walls where size matters and appearance doesn't.
- Consistency: PSL has tighter dimensional tolerances and predictable performance. No knots, no checking, no variability.
When Timber Wins
- Exposed architectural applications: A DF timber post looks like intentional design. A PSL column looks like an engineered product, because it is.
- Cost-sensitive projects: When the load can be carried by timber at a reasonable size, the cost savings are significant.
- Fire rating: Heavy timber qualifies for Type IV construction fire ratings. PSL does not get the same prescriptive recognition.
- Availability: 6×6 and 8×8 DF timbers are stocked at most yards. PSL columns may need to be special-ordered.
If it's visible, use timber. If it's hidden and the load is heavy, use PSL. That's the decision tree for 90% of residential column conditions.
Compare Column Products
Our Column Compare tool lets you compare DF timbers, glulam, PSL, LVL, and LSL columns by height, load, and cross-section. Side-by-side, no catalog required.
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