Product Info:

We carry timbers in a variety of sizes and wood species.

Timbers are beams/posts that are typically larger than 4×6 in dimension. They are available in a wide variety of sizes and can be special ordered in any exact size you may care to specify given the necessary lead times.

Timbers are generally available locally in various grades.

The variety of timbers include Douglas Fir, with Redwood, Cedar and treated wood options also available. Some alternatives to solid timbers are Laminated Veneer Lumber (LVL), Glued Laminated Timber (Glulams) and Parallel Strand Lumber (PSL).

There are HUGE differences in the quality of timbers.

Front Range Lumber prides itself on stocking mainly “FOHC” timbers. Note our STOCKED inventory 6×6 (8’ and longer) is 100% FOHC – free of heart center – which means the timber has been cut so as to NOT include what used to be the center of the tree. Any timber that DOES have the center of the tree WILL crack and twist far more than those that don’t have the center. The cracking will radiate out from that tree center as the timber dries out. Therefore, our FOHC timbers perform far better in such uses as pergolas and deck posts.

While FOHC timbers are not the LEAST expensive option, one of the most visible components of a deck, pergola or porch are the posts. If any post cracks excessively, that gnarly crack really takes away from a great looking project!

Consider Douglas Fir Timbers.

Although Western Red Cedar is still the premium product to use on exterior projects, another good alternative is rough sawn Douglas Fir Timbers. Many people believe that just because wood is rough sawn it’s gotta be cedar, but this is not always true.

Rough sawn Douglas Fir provides a good option at a fraction of the price of cedar. In addition, it is the available in a wider range of sizes and lengths. Doug Fir can also be an alternative simply because Colorado does not have the rot/decay issues Seattle or New Orleans have, for example.

Timber sizes and lengths.

Timbers are generally readily available in lengths ranging from 8′ to 24′ (in 2′ multiples). Longer lengths are available at times; please check availability before getting locked into a longer length. However, lengths over 20′ do carry a significant price premium.

“Normal” sizes include 3×12, 4×6, 4×8, 4×12, 6×6, 6×8, 6×10, 6×12, 6×14, 8×8, 8×10, 8×12, and 12×12. Timbers come in two types: S4S (smooth four sides) and rough sawn.

We’ve recently added 8×8-12 rough sawn fir and 6×6-20 smooth sawn fir!
Stocked Sizes

Doug Fir8′, 10′, 12′, 16′, 20′8′, 10′, 12′, 16′8′, 10′, 12′, 16′, 20′   
PTI or ACQ Treated8′, 10′, 12′, 16′10′8′, 10′, 12′, 16′   
ACQ Treated Landscape Timbers, Rough Sawn  8′, 10′ – green and brown 16′ in smooth sawn, ground contact, non-structural

AND 16′ in rough sawn, ground contact, structural
Rough Sawn Cedar6′, 8′, 10′, 12′6′, 8′, 10′, 12′, 16′6′, 8′, 10′, 12′, 16′ 
Rough Sawn Doug Fir  8′, 10′, 12′, 16′, 20′10′8′, 10′, 12′, 16′8′, 12′, 16′16′


Sizes listed are most readily available in stock at Front Range Lumber and not meant as a guarantee of stock.

Not all sizes stocked at both locations, but can readily be transferred to the other location and are available for delivery.

Additional Information
Rough sawn vs. Smooth sawn

Rough sawn timbers will be rough sawn (think similar to a cedar fence board) and close to the full measure. This means that an 8×8 will net out to be very close to a true 8”x8”. They are probably green – meaning no drying on the product has been done – and more likely to split, crack warp and twist. S4S timbers will be nominal sized, for example, a 6×6 will measure 5-1/2” x 5-1/2”. S4S timbers may be some variation of air dried, kiln dried or air-seasoned. Any of these drying methods will gain you a more stable timber. Very few timbers in the marketplace are dried to the core (“core-dried”). Most timbers are at best – kiln dried, a process drying the piece to a 1” penetration. S4S timbers will, of course, be smooth sawn. S4S and rough sawn timbers are similar in price; however, deciding factors may be the cost and availability of hangers for rough sawn material, these hangers run 30-50% more and are less likely to be readily available.


Probably the most important consideration on timbers is the free of heart center (FOHC) content/factor. This is the percentage of timbers that will contain the heart center. Heart center is the dead center of the tree and should be avoided if possible. On smaller sizes (6×6), the FOHC factor can be as high as 100%; on larger sizes (12×12) having the heart center is virtually unavoidable. The reason to avoid the heart center is that any board or timber containing all/part of the center of the tree is virtually guaranteed to “check” or crack as it dries unevenly. These checks will radiate out from what was the center of the tree. The funny thing about timbers having the heart center is that they will be among the best looking timbers to begin with – this makes sense since they are made from the tree’s center, further away from the branches (knots) and protected by the bark (insect damage). Timbers that miss the heart center will dry out more evenly and hence with less checking. While these checks generally do not impact the strength of that timber, they certainly can detract from its appearance. Regardless of FOHC content, grade or initial appearance, ANY board/timber can and will crack, warp, twist, cup and split.

Otherwise, grades on timbers are primarily based on their appearance; better appearance will dictate a higher grade (and price).


The timbers most readily available in the Denver area are of the Douglas Fir species. This species of trees provide a strong, economical timber. Most sizes listed above are offered in Douglas Fir, in both S4S and rough sawn varieties. Redwood is generally available in our region in only s4s type and only in 4×4, 4×6 and 6×6 sizes. Cedar can be obtainable in mostly rough sawn: 4×6, 6×6, 6×8 and 4×8 sizes. Any other species will be a special order item with at least some lead time and pricing that can be prohibitive. Treated (for rot/decay/insects) timbers are off-the-shelf locally in 4×4, 4×6 and 6×6 with a smattering of other sizes available quickly. Keep in mind that when dealing with a reputable dealer, virtually any timber can then be treated within approximately two-week turnaround.

Timber Alternatives

There are many options to conventional wood timbers, including laminated veneer lumber (LVL), glued laminated timber (glulams), parallel strand lumber (PSL) and structural steel. Most of these items come in 60’ lengths to be re-cut into your specified lengths. Ask your salesperson for more information, but a quick description is listed here:

Laminated Veneer Lumber (LVL) is available in 1-3/4”, 3-1/2 and 5-1/4” thicknesses and 5-1/2”, 7-1/4”, 9-1/2” 11-7/8”, 14” 16” and 18” heights. Most commonly used for support beams in interior construction, LVLs are strong, economical and non-appearance grade beams.

Glued Laminated Timber (Glulams) can best be described as 2x lumber stacked up and glued together to make a beam. This is a very attractive alternative for exposed locations. They are available in a wide variety of sizes for interior use. Glulams are also available in a limited number of sizes in two different exterior versions. One is an Alaska White cedar variation and the other is an ACQ-treated fir version.

Parallel Strand Lumber (PSL), similar to waferboard, consists of long veneer strands laid in parallel formation and bonded together with an adhesive to form a beam. This is an immensely strong beam, but must be covered as it is not for appearance or exterior purposes.


Since most timbers are special ordered for you, returns are not allowed unless the timber is damaged by us or deficient in grade or other similar fault. As such, please consider upfront the factors involved in using timbers before ordering.

Health & Safety

The obvious safety consideration with timbers is their size and weight. There are no special safety factors to consider while using timbers except for those that have been treated.

Design Tools

Use these design tools to plan your project.

Simpson Strong-Tie Deck Planner

Simpson Strong-Tie Pergola Planner

Please note: All product items/sizes/lengths/brands may not be available at either location, please call to verify availability.

Drivers and Sales Staff needed!

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