Douglas fir, pressure-treated, redwood, and cedar posts and timbers in a studio material display

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Posts & Timbers

Posts & Timbers

Posts & Timbers

Structural posts and heavy timber for exposed work.

Structural posts and heavy timber for exposed work.

Structural posts and heavy timber for exposed work.

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Capital Lumber Boise Posts & Timbers building-material category icon

Posts & Timbers

Posts & Timbers

View Products Below

View Products Below

4x4 - Douglas Fir Post — #1 FOHC/FOW Appearance Douglas Fir available from Capital Lumber in Boise, Idaho

4x4 - Douglas Fir Post

4x4 - Douglas Fir Post

Standard & Better / #1 FOHC/FOW

Standard & Better / #1 FOHC/FOW

A 4×4 Douglas Fir post is a compact structural member for bracing, shop projects, interior supports, and assemblies designed around a 4-inch post. Stock includes framing and appearance grades. Natural Douglas Fir is not pressure-treated; confirm engineering, protection, and code requirements before exterior use. Stocked for in-store pickup.

A 4×4 Douglas Fir post is a compact structural member for bracing, shop projects, interior supports, and assemblies designed around a 4-inch post. Stock includes framing and appearance grades. Natural Douglas Fir is not pressure-treated; confirm engineering, protection, and code requirements before exterior use. Stocked for in-store pickup.

8' | 10'

8' | 10'

6x6 Douglas Fir Post with a clean natural contact shadow, available from Capital Lumber in Boise, Idaho

6x6 - Douglas Fir Post

6x6 - Douglas Fir Post

Standard & Better / #1 FOHC

Standard & Better / #1 FOHC

A 6×6 Douglas Fir post brings more section depth to columns, pergola frames, heavy supports, timber details, and structural work designed for a larger member. Stock includes Standard & Better and #1 FOHC options. Natural Douglas Fir is not pressure-treated; confirm engineering and exterior protection with the yard. Stocked for in-store pickup.

A 6×6 Douglas Fir post brings more section depth to columns, pergola frames, heavy supports, timber details, and structural work designed for a larger member. Stock includes Standard & Better and #1 FOHC options. Natural Douglas Fir is not pressure-treated; confirm engineering and exterior protection with the yard. Stocked for in-store pickup.

8′ | 10′

8′ | 10′

6x12 - Appearance-Grade Douglas Fir Timber — #1 FOHC/FOW Appearance Douglas Fir available from Capital Lumber in Boise, Idaho

6x12 - Douglas Fir Timber

6x12 - Douglas Fir Timber

Appearance

Appearance

Broad appearance-grade Douglas Fir timber for exposed beams and custom architectural structures.

Broad appearance-grade Douglas Fir timber for exposed beams and custom architectural structures.

Varies

Varies

8x8 - Appearance-Grade Douglas Fir Timber — #1 FOHC/FOW Appearance Douglas Fir available from Capital Lumber in Boise, Idaho

8x8 - Douglas Fir Timber

8x8 - Douglas Fir Timber

Appearance

Appearance

Large appearance-grade Douglas Fir timber selected for exposed architectural and structural applications.

Large appearance-grade Douglas Fir timber selected for exposed architectural and structural applications.

Varies

Varies

4x6 - Pressure-Treated Douglas Fir — Standard & Better Pressure-Treated Douglas Fir available from Capital Lumber in Boise, Idaho

4x6 - Pressure-Treated Douglas Fir

4x6 - Pressure-Treated Douglas Fir

Standard & Better

Standard & Better

Pressure-treated Douglas Fir timber for structural outdoor construction, ground-contact applications, posts, beams, and heavy framing.

Pressure-treated Douglas Fir timber for structural outdoor construction, ground-contact applications, posts, beams, and heavy framing.

10' | 16' typical

10' | 16' typical

4x8 - Pressure-Treated Douglas Fir — Standard & Better Pressure-Treated Douglas Fir available from Capital Lumber in Boise, Idaho

4x8 - Pressure-Treated Douglas Fir

4x8 - Pressure-Treated Douglas Fir

Standard & Better

Standard & Better

Heavy pressure-treated Douglas Fir timber for exterior structural framing, beams, retaining applications, and demanding outdoor projects.

Heavy pressure-treated Douglas Fir timber for exterior structural framing, beams, retaining applications, and demanding outdoor projects.

10' | 16' typical

10' | 16' typical

6x8 - Pressure-Treated Douglas Fir — Standard & Better Pressure-Treated Douglas Fir available from Capital Lumber in Boise, Idaho

6x8 - Pressure-Treated Douglas Fir

6x8 - Pressure-Treated Douglas Fir

Standard & Better

Standard & Better

Large pressure-treated Douglas Fir timber for heavy structural, outdoor, and ground-contact construction.

Large pressure-treated Douglas Fir timber for heavy structural, outdoor, and ground-contact construction.

10' | 16' typical

10' | 16' typical

8x8 - Pressure-Treated Douglas Fir — Standard & Better Pressure-Treated Douglas Fir available from Capital Lumber in Boise, Idaho

8x8 - Pressure-Treated Hem Fir

8x8 - Pressure-Treated Hem Fir

Standard & Better

Standard & Better

Heavy pressure-treated Hem Fir timber for structural supports, outdoor construction, and ground-contact applications.

Heavy pressure-treated Hem Fir timber for structural supports, outdoor construction, and ground-contact applications.

Varies

Varies

SPECIFICATION HELP

Not sure what

to specify?

Not sure what

to specify?

Not sure what

to specify?

Start with the conditions, not the brand. The yard can narrow the products from there.

Start with the conditions, not the brand. The yard can narrow the products from there.

Start with the conditions, not the brand. The yard can narrow the products from there.

01 / APPLICATION

01 / APPLICATION

Where it will be installed, what it supports, and how it will be exposed narrow the right product.

Where it will be installed, what it supports, and how it will be exposed narrow the right product.

02 / SPECIFICATION

02 / SPECIFICATION

Nominal size, actual dimensions, grade, treatment, span, and code requirements should match the plan.

Nominal size, actual dimensions, grade, treatment, span, and code requirements should match the plan.

03 / LOGISTICS

03 / LOGISTICS

Quantity, lead time, pickup, delivery access, and job sequence determine how the order should be staged.

Quantity, lead time, pickup, delivery access, and job sequence determine how the order should be staged.

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© 2026 CAPITAL LUMBER CO., INC.

© 2026 CAPITAL LUMBER CO., INC.

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