Alder Knotty 4/4 Lumber Pack: 6 Boards, Choose Your Size

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Alder Knotty 4/4 Lumber Pack: 6 Boards, Choose Your Size

$79.00 /Pack

Free Shipping
48 U.S. Ground Service

Online Exclusive!

Only available online. For in-store purchase check out this similar product instead.

Why Choose Knotty Alder?

Lumber contains tight, sound knots throughout. A soft, relatively low-strength, straight-grained, even-textured wood. Works well with hand and machine tools, but sharp cutting edges need to be maintained to prevent tearing the grain. The wood is rarely wider than 6 due to the small size of the trees.

Lumber Pack Specifications

6 boards icon
6 beautiful
hand-selected boards
straight line ripped
Surfaced & straight-line ripped
lumber sizes
Your choice of widths and lengths
straight line ripped
Free ground shipping 48 U.S.

Thickness 4/4, S2S is 7/8" thick
Width 4"-6", or 6"+
Length 36", 46" or 84"
Quantity 6 Boards
Grade Knotty Frame Grade (info)

About Lumber Sizes & Shipping Length Restrictions

Knotty Alder lumber packs come with YOUR CHOICE of sizes. Here's what you can expect.

4"-6", or 6"+ Widths

We're here to help you build a successful project. Choose what works for you.

36", 46" or 84" Lengths

This is the range of lengths you can choose from for this pack.

7/8" Thickness

Also known as 4/4, S2S. This means the boards you'll receive will be surfaced on 2 sides (S2S) to 7/8" actual thickness.
Learn more in our blog: "What Does 4/4 Mean in Lumber?"

About Knotty Alder (Alnus rubra)

View All Knotty Alder Products


lbs /Bd. Ft.
-34.92% lighter than red oak (3.58 /bd. ft.)


Janka Rating
-54.26% softer than red oak (1290 psi)


Specific Gravity
-35.94% less dense than red oak (.64)

General Workability
Good 4/10
Red Oak

Wood Texture
V. Fine 2/10
Red Oak

Ease of Finishing
Good 4/10
Red Oak

map of where Knotty Alder tree grows
Knotty Alder is a domestic wood from North America

Lumber contains tight, sound knots throughout. A soft, relatively low-strength, straight-grained, even-textured wood. Works well with hand and machine tools, but sharp cutting edges need to be maintained to prevent tearing the grain. The wood is rarely wider than 6 due to the small size of the trees.

color of Knotty Alder
Color Range
Pale Yellow to Reddish Brown with dark knots
the Knotty Alder tree
What's The Tree Like?
A relatively small tree, reaching about 50ft in height and producing a trunk in diameter up to 15".
other names for Knotty Alder
Other Names
Alder, Oregon alder, Pacific coast alder, Red alder, Western alder
uses for Knotty Alder
Some Typical Uses
Rustic furniture, entry doors, moldings, turning, carving, toys, plywood, veneer, cabinets, musical instruments.

Lumber 101: What to Know About Hardwood Lumber

lumber random widths Random Widths
You will cut and/or glue to create the sizes you need
rough sawn vs surfaced lumber Surfaced Smooth S2S
We buy rough sawn lumber and have it surfaced 2 sides (S2S) so you're ready to work
rough sawn vs surfaced lumber Kiln Dried
We stock kiln dried lumber and store it in a protected warehouse
rough sawn vs surfaced lumber 83%+ Clear
Unless stated otherwise, we stock Select & Better graded lumber that's at least 83% clear one side
  1. Pick a wood you like
  2. Decide how much you need
  3. Give us your specs (if you have any)

This is the unit of measurement for hardwood lumber when it's bought/sold in random widths and random lengths.

Board footage is a measurement of volume, and it's abbreviated Bd. Ft.

One board foot is equal to 144 cubic inches.

board foot formula

It's a fraction that refers to rough (RGH) sawn thickness of lumber, and it tells you approximately how many quarters of an inch make up the thickness.

Surfaced lumber is thinner because it started out as rough sawn but it's been planed smooth. Planing removes thickness.

Rough Sawn (RGH) Surfaced (S2S)
4/4 ~1" 13/16"
5/4 ~1-1/4" 1-1/16"
6/4 ~1-1/2" 1-5/16"
8/4 ~2" 1-13/16"
12/4 ~3" 2-13/16"

Unless otherwise specified, our lumber is "Surfaced 2 Sides" or S2S for short.

Check out our blog for the full explanation.

lumber thickness Lumber Compared
Various lumber thickness as compared to one another

If you can cut your own pieces to size, here's how we can help:

  1. Enter requirements into the order form where it says, "Minimum Size Request"
  2. Tell us what you want to acheive or make
  3. You will receive wood that can yeild what you need. (You will create the final size)
  4. We may need to contact you for clarification

You will cut and/or join your material to create the finished sizes you need. We'll pick out wood that will give you enough to do that. For this reason, the final amount of footage you receive in your order will be slightly different, and your final billed charge will be different.

If you want to only buy pieces of an exact size, that will be sold differently. Please contact us for a custom quote.

Sadly, wood cannot be 100% guaranteed to be clear on both sides all the time. Most of our lumber is graded "Select" and better, which means it's at minimum 83% clear on one side.
Hardwood grades explained
20 Reviews
3 star
2 star
1 star
Pages 1   2   3   4
March 29th, 2023
Verified Buyer
New Woodworker
Some pieces were substandard
I bought 6 pcs 46" and 6 pcs 36". Made a coffee table and used probably 1/3 of total or less. Overall, these were fine and I'd buy them again. Here are three things to note: 1. The boards were advertised as 4"+ and almost all were actually closer to 5". However, two narrowed toward the ends and only about 3" of width was usable for the entire length. I ended up with slightly less than 24" of usable width after ripping the rough edges (24" should have been the minimum I got) for the 46" inch boards. 2. These boards were one inch thick, not 13/16" as advertised. While this may be a good thing, I had to find a way to get them planed down to 3/4 without a planer. 3. All the boards were really straight and looked better than I was expecting.
Familiarity: I've used it once or twice
June 30th, 2021
Verified Buyer
Suffolk VA
New Woodworker
Exceeded expectations
Quick arrival. Nicely packaged.
Familiarity: I haven't used it yet
June 25th, 2021
Verified Buyer
Hobbyist Woodworker
alder pack
as expected
Familiarity: I've used it once or twice
October 30th, 2020
Verified Buyer
Hobbyist Woodworker
Alder Project
I bought Alder to match our house decor. I needed to make a partition in our multi-media closet to support an articulating tv mount and surround sound system that would also hide the tangle of wires supporting the technology. The solution was to make two doors of alder that matched the closet doors and attach them to sturdy framing that would support the leverage and weight of the mounts. It turned out great. Perfect match with the closet doors including stain and finish.
Familiarity: I've used it once or twice
September 18th, 2020
Verified Buyer
Port St Lucie FL
Alder Knotty Order
Ordered 40BFT for a credenza build for my daughter and was very happy with the quality of the wood. The knotty look is something that my daughter enjoys so this wood is perfect for this project.
August 31st, 2020
Verified Buyer
Knotty Alder delivery
Received a nominal 20 bd ft of very nice boards. dimensions were good, one board was 7 in. by 84 in. The number and size of knots was less than I expected. A good selection. Delivery was timely.
Videos, Articles, and Project Photos to Help You Do Woodworking
What's 4/4, 8/4, 12/4, etc.?
Understanding hardwood lumber starts right here with these wacky fractions.
Lumber Grades Explained
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3 Steps To Figure Out How Much Lumber You Need
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Project Planner Worksheet
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