Home Decor | Projects | Tutorials | Woodworking

How To Build a Rustic Faux Beam Mantel

In this step by step tutorial, I’m going to demonstrate how to build a rustic faux beam mantel. I will show how I distressed the wood to give it an aged reclaimed look for a fraction of the cost of a real reclaimed beam.

Hey Guys! So recently I was approached by a neighbor for assistance with a project in her home. She and her husband had removed the old mantel from their fireplace in the living room because it was damaged. After removing the old mantel they both realized that they hated their existing fireplace. They didn’t know exactly how to refinish it or what direction they wanted to go. So we talked about various ways in which they could make some changes without breaking the bank. My neighbor loved the idea of painting the old brick white and adding a rustic wood beam mantel. She also had never really used power tools. So we worked together and this is what we came up with. She provided me with a list of things that she envisioned for her fireplace, in which I took and created a floating mantel that looks like it’s an old vintage beam that you’d find in some old farmhouse or barn. She and I then installed it together. Here’s what we did.

How to Build a DIY Faux Rustic Beam Mantel Shelf - Toolbox Divas

Materials

DIY Rustic Fireplace Mantel Toolbox Divas (6 of 25)

Tools

OK, Let’s Get Dirty!

Steps

Step 1. Cut the wood to size.

In order to achieve the illusion of a single beam or solid piece of wood, it’s important that the cuts for 3 of the sides of each piece be made at a 45-degree angle along the entire length of the wood pieces. The back of the mantel is flat and open. So the back will have a straight edge. You can make these cuts using a circular saw.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 44Step 2. Glue and Assemble the Beam.

Using wood glue and a brad nailer attach the front board to the top.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 43

This part may require a second pair of hands or really good clamps as you get everything in place.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 42

With the top board and front of the beam attached it’s time to add the side. 3 sides are cut at an angle while the part that faces the wall is flat.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 41

I used my Kreg multi-purpose layout tool to ensure that all of the sides were square.How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 40

Step 3. Age and distress the wood beam.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 39

In an effort to achieve an aged or vintage finish, I did a couple things outside of my norm. I had no clue what would work.  But I figured at the end of the day,  it couldn’t hurt. I mixed the wood dye I was using to stain the mantle with the wood filler and applied it along the seems.  I filled in nail holes and pretty much applied it everywhere.  I’m not sure I would have done this the same way if I had to do it a second time. LOL

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 38
TransTint Dyes, Dark Mission Brown

.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 37

It was all in an effort to make this mantel look as old and rugged as possible. (Remember when using the wood filler of this sort, you want to wear a respirator and use in a heavily ventilated area.)

I then beat the mantle with a hammer and literally any sharp object I could find in my garage.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 36

 

Step 4. Sand down the mantel.How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 35

I started with my oscillating sander and then I moved to my belt sanders so that I could create dents in the corners and on the edges in an effort to create more detail and depth. I went over everything with a coarse sandpaper, then a medium grit sandpaper. I sand it all down until it was smooth and wiped out any excess dust.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 33

Step 5.  Assess the distressed markings.  If satisfied, move on to the next step.  If more distressing is necessary, repeat steps 3 and 4.

I then stepped back and reviewed everything.  I thought the mantel could use some more character.  So using my Dremel and the sanding tip I carved into the edges and into the front of the pieces of wood.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 32

I even used a chisel to get in some nicks and scratches.  To be honest, you could really do this all day. So it is up to you when to know enough is enough.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 31

Once I felt like ththat’s enough I sanded the mantel down once again down to a finer finish, starting with 80 grit coarse sandpaper, the 100, then 150 and finally a 220 grit sandpaper.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 30

 

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 47

For the sandpaper, I used SandNet Disc by Diablo . This sandpaper is great because it lasts so long.  You can literally use them and shake it off or even rinse it off and reuse it.  Also, it takes off a tremendous amount of wood.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 47

Then I wiped dow the boards with a damp cloth.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 29

Step 6: Stain and apply paint treatment.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 28

Once I’d gotten the mantel to a desired distressed look I stained it using wood dye.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 23

For the corners and creveces I applied an acrylisc paint treatment, blending various shades of brown.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 26

Hahaha I loved using the scrap wood as my artist palette.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 24

I then sanded down spots with a fine 220 sandpaper before reapplying the 2nd coat of wood dye.  I loved the way the stain/dye took to the boards.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 27

Step 7. Mark the location of the corbels and cut the board for the bottom of the mantel beam.

Mark 10 inches from each side.  This is where the faux brick corbels would be placed.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 46

Using scrap wood plywood I cut out the board for the bottom of the mantel beam.  This board will not be seen.  All of the sides are cut in straight edges.  Then I drilled the pocket holes.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 22

Step 8. Create the faux brick corbels.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 21

Using 2×4 wood pieces cut the pieces needed to create the faux brick corbels. 2 sets at 7in., 5in., 3in., & 2.5in.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 20

Attach using wood glue.   So when I created the first corbel I attached using glue and clamped it all together.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 19

 

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 18But when I got around to the second corbel, I realized I was going about this all wrong.  I can quickly assemble the corbels with the help of my brad nailer.  So using wood glue and the brad nailer to hold the pieces in place I assembled the 2nd corbel.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 17

.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 16

You can do this either way.  If you have a brad nailer you can attach this way of just use clamps and wood glue.  With wood glue you do have to wait 24 hours for it to dry.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 15

Step 9. Attach the corbels to the bottom board.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 14

Attach the corbels to the bottom board before attaching it to the mantel.  This makes the addition of the corbels so much easier.  Each corbel should be placed on the pre-marked line on the board so that it is 10 inches from each side.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 13

Using Spax screws I attached the corbels to the bottom board.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 12

Step 10. Attach the bottom board to the mantel.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 10

Finally with the corbels attached I attached the bottom of the mantel using pocket screws.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 9

Step 11. Create the support beam for the floating shelf mantel.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 51The shelf support is simply 2×4 cut down to fit the length of the mantel so that the mantel can rest on it.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 50

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 49

.

Step 12. Install the Mantel.How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 8

With the mantel fully constructed it was time to install this baby!  We started by pre-drilling the screw holes for the shelf support.  We used the Bosch Daredevil Multipurpose drill pits for this because they are absolutely amazing. These drill bits drill through wood and brick with such ease.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 7

With the holes predrilled we started the screw through the board on the floor.  I highly recommend prestarting the screws.  It makes the process easier.How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 5

We then matched the screws up with the predrilled holes in the brick and finished screwing each screw in place.  It was so easy.  I recommend using a screw like Tapcon ancors when working with a brick fireplace.  It provides a little more support.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 4

Make sure the shelf support is level before attaching the mantel to the support.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 3

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 2

Lastlly using some Spax screws we drilled the mantel to the back of the support beam.

How to build a Rustic Faux wood beam mantel or floating shelf - Toolbox Divas 1

 

WOW! What a world of a difference.  My neighbor’s family room looks like a totally different space.

DIY Rustic Fireplace Mantel Toolbox Divas (22 of 25)

I have to say that I love how the mantel turned out. It totally changed the look and feel of the room. It made me want to go back and create some faux rustic beam floating shelves for my house. The pieces of wood used to create this mantel actually look like a solid piece of wood. It has a reclaimed vintage feel. We transformed a dated fireplace with simply a little paint and rough lumber that you can easily find at your home improvement store.  The estimated total for the paint and materials used for this transformation: $50-60. Not bad at all.

DIY Rustic Fireplace Mantel Toolbox Divas (11 of 25)

DIY Rustic Fireplace Mantel Toolbox Divas (14 of 25)

 

DIY Rustic Fireplace Mantel Toolbox Divas (10 of 25)

Till Next Time. ~T.

Similar Posts

35 Comments

  1. Thank you so much for your plans! Just spent 3 days putting together a mantle based off your plans. Keep up the awesome projects!

    1. Hey Josh! Thank you so much. I am so glad you found this post helpful. I know your mantle looks awesome!

  2. A best and wonderful DIY project with wood and hammer drill. Such kinds of information I search a lot of blog. Truly said that I got an excellent article from you. I feel comfort for reading your post. Your post is valuable and comfortable and good advice for beginners.

    1. Wow thank you so much Danny! That means the world to me. Thank you so much! I really appreciate it.

  3. Thank you so much for this wonderful tutorial…I am going to try this out..Can i buy tools here?

  4. Hello! After seeing these on Etsy, I’m thinking about tackling this myself with your awesome tutorial. One question. What does the mantel look like on top after screwing it to the support board? Are the screw heads visible or did you countersink them and cover them with something? I’d just hate to go to all of the trouble to make that mantel and then have to see screw heads. Any info you could give would be so helpful!

    1. no it’s not visible. It looks just as rustic on top as it does from the sides. I countersunk the screws.

  5. This is wonderful! I wish I could hire you to build me one! What kind of wood did you use for this project?

    1. Aww thank you so much! I used inexpensive pine off the shelf from Home Depot.

  6. Fantastic Job! Perfect mantle for my place. Thank you!

  7. Hi, this looks great! I do have a question – how do you go about making the 45 degree cuts on the long board? Seems a little tricky to me. Thank you!

    1. You can use a table saw with a long outfeed table or the easiest way in a home workshop is using a circular saw or track saw. Make sure the board is supported on both sides so it doesn’t cave in the middle. But angle blade to 45 degrees.

  8. Oh, one other question! I have always heard that pine can be tougher to take a stain. But you used a wood dye? What type pf dye did you use? Thank you very much! Again, really cool project, I’m impressed!

    1. Thank you! Yes Pine is frustrating when staining. It should be treated prior to staining. If using a Wood Dye you want to treat the wood by spraying water on the piece to lift the grain prior to applying the wood dye. I use TransTint Dyes mostly.

      1. Thank you for your responses! I’ll keep them in mind. You inspired me and gave me direction on making my mantel, so thank you for that. We decided to go with rough cut cedar, since it gave that rustic look we were going for…I haven’t stained it yet, but will test out a few options, possibly just tung oil or boiled linseed.

  9. Hello! So I wrote you a few weeks ago asking what kind of wood you used. And while I didn’t exactly follow your tutorial (the 45 degree cuts are DEFINITELY above my skill level) your post gave me the confidence that I could do something CLOSE. So my husband and I put our brains together and made something close to the beauty you created. Thank you for the confidence boost and spelling it out SO clearly. I LOVE my faux mantle and couldnt have done it without your tutorial!!!

  10. Very nice job! Love it! Thanks for the detailed instructions.

  11. Wow, I always hold back while distressing. This truly looks like an authentic barn wood bean! Awesome distressing and coloring! Fantastic work!!

    1. Thank you so much Bridget! Don’t hold back. Just go for it. You won’t go wrong. It’ll just look older.

  12. Absolutely Love Your Faux Beam!..looks so Natural!!..Appreciate your detailed instructions..and the fact you wrote them out so pretty much anyone could follow..Excellent job!!..can’t wait to get started!..
    Here’s a tip..when distressing things for a rustic look..I love using a hand grinder..make sure to secure the piece you are working on..practice on a piece of wood first..for different looks…then I use a dark stain over those areas.. Wiping off with a rag till i get the desired look…super fun and fast using the hand grinder!!..Ppl…Do be careful tho!..use your PPE!!..Thx Again!!

  13. Thank you Tamisha!
    I used your faux beam tutorial as the basis to make one in my own. I’m almost finished and it looks awesome!
    The use of acrylic paint what’s made it look so real.

  14. Curt McCune says:

    Wow! You are VERY skilled!!! I am going to try this, as I am in the process of “re-doing” our fireplace wall! Thank you so much for this!

  15. Do you have a news letter I can subscribe to?

  16. Great!! I, too (maybe), can do this. Your instructions are the best – nothing left to chance or guess. I love the authenticity of the picture of your sawdust-covered hand showing the wood tint!! But I have one question: Did you create the abstract art above the new mantel too? I love that piece!!

  17. Jill Carpenter says:

    Absolutely one of the best how-to’s ever! Clear instructions and good materials list.

  18. Well done..what a fantastic looking make over. Cheers Kaz from Oz 😆

  19. This was a very informative article. I will be doing this ASAP!!! Great job on the mantel and explaining the steps you used.

Leave a Reply

Your email address will not be published. Required fields are marked *