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Blog > Custom Timber Frame Design, Design, Glulam, Uncategorized > Glulam vs. Solid Beams: Which Is Best For Your Project?

Glulam vs. Solid Beams: Which Is Best For Your Project?

By Caitlin on November 07, 2017

Customers often ask us about using Glulam in their building projects and want to know how this material differs from solid WOOD beams.

And how do you know when to use Glulam in your project and when to use timber?



Glulam made from Douglas Fir.


Glued laminated timber, also called Glulam, is a type of structural engineered wood product comprising a number of layers of dimensional lumber bonded together with durable, moisture-resistant structural adhesives.

Glulam provides us with a longer and larger piece of building material that is composed of smaller pieces of lumber. This allows Glulam to be made from younger trees from second and third growth forests, and this makes Glulam relatively sustainable and faster to replenish than larger pieces of whole timber from older, bigger trees.

Glulam is stiff and sturdy and can be bent and shaped. It is able to make longer arches than traditional heavy timber and not require a supporting beam or post.

Glulam Arched Beams and Matching Window

Douglas fir glulam arched beams match the custom round top window perfectly.

The strength of Glulam can also be considered more reliable than solid beams because while the individual lams might have a knot or imperfection, the effect of those imperfections will be lessened by the lams nearby that don’t have imperfections and act as stabilizers for one another. A solid log that has an imperfection might not be as strong if the imperfection is large and weakens the whole beam.

Glulam is also less prone to shaking, checking and warping since the smaller pieces of wood have been seasoned and laminated. This generally makes Glulam more stable than traditional timber.

Glulam can also be more expensive than traditional lumber.

When stained, it can look noticeably different than a solid piece of Timber and has a different aesthetic than solid beams.


unfinished douglas fir beamUnfinished planed Douglas Fir

Solid Beams

Solid beams have been used for Timber Framing for hundreds of years. They have a classic look and feel that a lot of people love inside their homes. If you want the classic look of a timber frame home, you’ll choose a solid wood for your Timber Frame.

A Timber Frame constructed out of solid beams of timber will be strong and durable, but there is the possibility that the wood will crack or check. However, engineers account for this and often the cracks or checks don’t affect the structural integrity, they just change the look of the beams. Some people love this look and think it adds to the rustic quality of the timber frame.

Beams constructed from rough sawn Hemlock timber and Birch pegs.

What is most important to you?

When deciding between Glulam or Solid Beams it can come down to a matter of cost, design, and aesthetics. If you want something architecturally interesting and complex, with long arches over a wide open space, and with no beams interrupting the flow of the space, then Glulam would be recommended.

If you can’t justify the cost of Glulam and you’re more concerned with achieving the aesthetic look and feel of a traditional timber frame home, then Glulam would not be the right choice for your project.

It is also quite common to use a combination of Solid Beams and Glulam in a timber frame structure. This allows you to mix and match based on what’s important for you.

For example, you could reinforce load bearing areas with Glulam that won’t be seen and use traditional timber for the rest of the structure. This would give your home the strength you want as well as the visual appeal. Or you could use Glulam for the long arches and do the rest in a heavy timber, mixing both types of appealing wood aesthetics.

Both Solid Beams and Glulams are a strong, durable building material and are excellent choices for your Timber Frame project.

Give us a call if you have any further questions or would like to discuss a project with Glulam or solid timber beams.



  1. Seamus Lyons says:


    I work for Studio Gang Architects who are designing a building in San Francisco and are thinking of using glulam doug fir beams for an exterior exposed truss structure. The longest span for a beam in this truss is roughly 15ft.

    My question is: Should we go with glulam beams or solid timber beams? Issues would be cost, appearance and performance

    • Doug Friant says:

      For a 15 foot span, it is really up to you. The look of the timber is the most important thing as the span is relatively small. Glulams are made up of narrow pieces of wood glued together. They are more stable, and less pron to checking, but the laminations are visible. Solid timber is natural, and looks natural. It can check, which many people feel adds to the character of the wood.

  2. Hello, in my country there is not 8×8 wood size, its a weird wood size and i am thinking about to make beams and posts with glulam for a department. So if you can answer me this 3 cuestion i am going to be really thankfull with you

    -Consider you that is a good idea make 8×8 with glulam technic?

    -Can i make traditional joints(timbre frame joints no nails or screws) with glulam?

    – in my country i can adquire 6×6 and 6×8 in S4S sizes. Do you consider that is better desing a department with 6×6 and 6×8 than a glulam technic?

    I am electromechanical engineer but i would like to heard a experience person in the topic like you. Thanks

  3. sheila says:

    are glulam beams considered heavy timber for the purposes of determining the construction type in a code analysis?

    • Caitlin says:

      Hi Sheila,

      Yes, Glulam beams would be considered heavy timber in building code and fire code.


  4. Alfonso Martinez-Solorzano says:

    I am having a ramada built 15’x13′. Would solid 6″x10″ #1 DF smooth beams not be sturdy enough for this? The pillars are concrete, and I’m being told I need to use gluglam beams.

    • Caitlin says:

      Hi Alfonso,

      It’s hard for us to make that determination without knowing more about the project. Your local experts will be able to advise you on this and make sure you use the right materials for the job.


  5. Gary Stewart says:

    Three laminated beams (two 9′, one 8′) are long past due for replacement after 45 years of exposure to northern AZ sun and moisture. The beams provide support to a roof overhang, but are not load bearing (they rest on masonry walls and tie the perpendicular supporting beams together, complete the rectangle). Would solid timbers beams be better than glulam beams? The local lumber yard suggested (pricey) Alaskan yellow cedar glulam beams over fir gluclam beams.

    • Caitlin says:

      Hi Gary,

      If the masonry walls are doing the work, any type of beam would be fine. It is just a question of rot resistance. Alaskan Yellow Cedar would be fine – either solid or glulam. If the beams are covered, Douglas Fir would be fine also. We have had good luck with Port Orford Cedar as well.

      Good luck with the replacement!


      • Nija Rosamond says:

        Hi Caitlin
        Is the Douglas fir not good enough to just stain and have for covered lanai?

        • Caitlin says:

          Hi Nija,

          In this instance it’s all in what he wants to do. AYC has much better rot resistance and insect resistance, whereas D. Fir (heartwood only) is okay with rot resistance, and could be susceptible to insect attack. I’d listen to the local mill if that’s what they’re recommending, the upfront cost will probably wash in that if he uses AYC he probably won’t have to replace them again, whereas with Fir he might have to. That being said, with proper maintenance D. Fir should also be fine.



  6. Ivan Yurtin says:

    I need two 35′ beams across the top of my walls. Is a 6 x 14 Gluelam better than a sawn beam for support?

    • Caitlin says:

      Hi Ivan,

      You’re right in that the glulam beams would be smaller as they have better strength values. Though either could work, and it would depend on what your structural requirements are. This isn’t really a question we can answer sufficiently without being there. A local engineer would be able to give you a better answer.



  7. Mat florian says:

    i need (5)16 X7 X 40 beams PT to build a floating raft to cary heavy equipment will a laminated beam hold up in salt water ??

  8. Louie says:

    Hi. I determined that my 18’7″ span requires a 3 1/8×13 1/2 glulam. What is the dimensional lumber equivalent?

    • Caitlin says:

      Hello Louie,

      Ultimately this is unknowable with the given information as there are so many unknowns. You must have used an allowable bending stress (psi) for the glulam that you designed (i.e. 20F = 2000 psi), so you can work through a similar process with your proposed dimensional lumber species and grade. The allowable bending stresses are complied in the AWC – NDS Supplement. That stress then needs to be adjusted with all applicable adjustment factors per chapter four of the NDS.

      Or I’d recommend getting a local building inspector or engineer to take a look and check it out.

      Thank you,

  9. Mark Feldman says:

    Good morning! I’ve got 2 commercially constructed arched Glulams built with 2×6 Doug Fir. Each has a beam depth of 21″, finished width of 5″, chord length of 25′, and curvature radius of 150′ (very little arch). I’m wanting to use these in place of trusses for a 2-car carport and am wondering about snowload capacity. If I construct the carport such that each arched glulam spans 22′ (each ends rests on a post), the two glulams are 16′ apart (beam centerline to beam centerline), with perlins between the 2 glulams, can you tell me what lb/sq ft snow load capacity to expect (or how to calculate it)? Thanks!

    • Caitlin says:

      Hi Mark,

      There are so many unknowns that we can’t adequately calculate the snowload for safe building use (i.e. grade of glulam, dead load, roof pitch, unbalanced snow loads, site concerns, ground snow load for his location, etc.) We would suggest looking for a local engineer familiar with the local codes and loads, or the local/town building inspector to help you with this.

      Good luck with your project!


  10. Aaron D Gammel says:

    In a car their a solid timber beam 5 1/2″ x 13 1/2″ x 22′. Is a glulam in the same size going to be just as strong or stronger than a solid timber beam?

    • Caitlin says:

      Hi Aaron,

      It depends on the grade of the glulam and the grade of the timber. Typically glulam beams have more capacity for their size compared to a comparable timber, but each case is unique.



  11. Jacob Jones says:

    I’m building a deck in Northern Utah and was told glulams are designed for internal use only. Is there a difference between using 3 2×10’s or 2 2×12’s instead of a glulam?

  12. Elsa Burchinow says:

    Hi: I am having a pergola / deck project built abd my GC suggested Glulam. My question is whether the 10 x 20 ft pergola could be built with just 4 posts using glulam or would I need 6 posts? Does glulam come in 20 ft lengths? what would be the cost ?

    • Caitlin says:

      Hi Elsa,

      It is hard to say without doing a proper structural analysis, but six posts would probably be best – you might get away with four if the beams were sized by an engineer depending on the project location and snow and wind loads. Glulams come in very long lengths, 20′ is no problem. If you’d like an estimate on the cost of the Glulams, you could give us a call at 802-886-1917 and talk to our sales staff about a quote.

      Thank you,


  13. Svan says:

    is Glulam beam stronger than the old fashioned Flitch beam?

    • Caitlin says:

      Hi Svan,

      A flitch beam is made of three parts that are bolted together: wood beams on the outside and a steel plate sandwiched between them. They have some strength advantages, but we rarely use them because of the labor involved and the look of the bolt heads. They do look great in old mill style frames where steel is featured.



  14. click here says:

    Glulam can also be more expensive than traditional lumber. When stained, it can look noticeably different than a solid piece of Timber and has a different aesthetic than solid beams.

  15. stucco says:

    Great topic, I also go for a combination of both. Because you can build a timber frame structure that has both solid beams and Glulam beams or cross-laminated timber in the building structure. In areas where the wood isn’t visible, you can go for Glulam. For the rest, you can use timber.

  16. Lance says:

    I really liked the article and will apply some of these ideas to my business. Thanks for sharing!

  17. Larry says:

    Wowzers! Those solid beams are saweeet! Lol Very nice!

  18. Jake P. says:

    I have just began learning about timber frames. Very interesting form of building, looks quite rugged and rustic yet very luxurious.

  19. As for my garage building project, I think both is needed.

  20. Ben Angus says:

    Hi there

    I’d be interested to know if glulam can be used with traditional pegged mortise and tenon (non steel ) joints ? If this isn’t often done , then I’d love to know why ?


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