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Make Porch Column Bases from Pressure Treated Lumber

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by Jeff Patterson in Exterior DIY Projects

After swallowing my fear I decided to give it a shot and build our own porch column bases out of pressure treated lumber. I

t’s amazing how cheap you can construct stuff with a little know-how and some tools.

Plus, the big upside  is affordability. Wood is super cheap, durable, and can look awesome.

Why should you read on?

This post is important to you because:

  1. You’ll learn how to pick out pressure treated lumber
  2. You’ll discover how to use a rafter square and circular saw to cut wood quickly & easily
  3. And finally, if you have porch column bases like mine you’ll save at least $200 doing this project yourself

To refresh your memory, here’s the rotted wood that was “supporting” our porch column.

Porch Column Base Damage

This is 10 out of 10 for rottenness.

These buggers didn’t exactly let us know they were going to the dark side until it was almost too late.

We noticed this dangerous issue while doing an annual inspection of the house.

Before getting started on this project we wanted to know which material was better: pressure treated lumber or PVC boards. A trip to the local lumber yard would prove to be invaluable.

84 Lumber

Eric was the manager who helped clear up a lot of question for us.

He was super patient, listened to our story, and even looked at several photos of the porch. We told him our idea of making a tiered platform and he agreed that the design would hold up the porch roof’s weight. So we got a Green Light on design (this part of the project wasn’t hard since all we did was copy the old design for the most part).

Eric ultimately convinced us to go with pressure treated wood because PVC expands & contracts at a faster rate than wood. Not good if you’re looking to hold up a roof that weighs hundreds if not thousands of pounds. Yes, PVC will never rot or be ruined by harsh rain storms. But the expanding and contracting over time could cause the column to move out of plumb. This is helpful info to learn because I’d prefer our porch not crush someone into a pancake!!

Before going to the lumber yard we measured the old bases and came up with these dimensions

  • 12 x 2 (very bottom base)
  • 10 x 2 (middle base)
  • 1 x 8 (top base right under porch column)

Porch Column Base Makeup

Perhaps Eric could see our angst or had a great cup of coffee or is just a great guy. Whatever the case, he was fantastic to work with because we got our wood for 50% off and he threw in some scraps for free.  He was able to give us a good deal due to some of the wood being splintered at the ends. How should you choose your wood if you don’t have an Eric?

Make sure there isn’t any major splintering through the entire piece you’re working with and try to avoid major knot holes more than 1 inch in diameter.

Choosing Good Wood

My wife took this picture and said, “You look goofy”. Thanks, thanks a whole bunch. But who cares, the point is to show you what a bad piece of wood looks like. Who cares if there’s a goofy looking dude in the photo, right?

Once we sorted the good wood from the bad it was time to make the individual pieces of the tiered column base design.

A long time ago we made the mistake of thinking that a huge setup with saw horses and clamps was necessary  to cut wood. In reality all you need are two 2 x 6s, one circular saw, a measuring tape, pencil, and rafter or combination square. And this is much sturdier and safer in my opinion than working on a table. The 2 x 6s can be placed on a level sidewalk, patio, or driveway. Fortunately our driveway has a level pad!!

Setup for Cutting Wood

The bottom portion of the column base is a 12 x 2 piece of wood. After inspecting the wood we noticed there was some splintering on the end. So this needed to be trimmed off. If you’re cutting wood you’ll need to set the depth of your circular saw to be a bit deeper than the wood’s depth. In this case we used the 2 x 4 setting since the 12 x 2 is really 1.5 inches deep.

Set Depth of Circular Saw

Cutting our base pieces was super easy. The width of the 12 x 2 was 11.5 inches. So we measured 11.5 inches over from the end, made a mark with the pencil, and positioned the rafter square on the board. Rafter squares are very handy when cutting wood because the circular saw can use it as a guide to make straight cuts. You can center the saw’s blade on your  pencil mark then slide the rafter square onto the wood until it’s flush with the saw’s guide.

Use Rafter Square as Saw Guide

In less than 10 seconds we had a perfectly square piece of pressure treated lumber. Yah, it’s that simple. In fact, it’s easier than loading the dishwasher in my humble opinion.

We did this for the 10 x 2 and 1 x 8 sections of wood as well. Now, here’s the cool part. All our measuring for the day was done because we used the newly cut bases as  templates for each successive cut.

Use New Base as Template

Literally all the base pieces were cut and ready for assembly in less than 15 minutes. Making This Old House Proud, baby!! Oh yah.

The initial 3 tier look wasn’t bad but a little blah and boring.

Initial Wooden Base Look

It’s at this point, a little voice creeped into my head. It was Adam Carolla and he was telling me to add a Roman Ogee effect with the trim router that was collecting dust in the tool cabinet.

So I routed the bottom and middle tiers to make them look more interesting and custom. The top piece of wood couldn’t get this same treatment because the router would take off too much wood and the column would hang over the edge. Take a look at what a difference the router made.

Roman Ogee Effect 1

Roman Ogee Profile

The next step in building the bases was to stack them so that the porch column’s weight would be evenly distributed in the center. We placed the 10 x 2 on top of the 12 x 2. Then I made the two sides of the 10 x 2 flush with the 12 x 2 edges like in the picture below and measured the distance between each respective edge of the 10 x 2 and the 12 x 2. Our distance was 1 inch based on my measuring tape in the picture.

Make second tier flush

We halved this distance, made marks 1/2 inch from each of the four corners and used the rafter square to draw straight lines across the 12 x 2.

Making half inch marks at the corners

Straight Lines with Rafter Square

We were left with a penciled template on the 12 x 2.

Penciled TemplateWe then placed the 10 x 2 inside this template and secured it to the 12 x 2 with 2.5 inch deck screws. This is the easiest way to center the 10 x 2 on top of the 12 x 2.

Secure 10 x 2 with Deck Screws

Since I’m not a complete nimrod I did the exact same template strategy on the 10 x 2 for the 1 x 8. And  we placed “X” marks in the corners of the 10 x 2 to show the screw orientation because the 1 x 8 would obviously hide the screw heads.

Mark Orientation of Screw Heads

The final step in making the tiered column bases was to add the 1 x 8 on top of the 10 x 2 and screw it in place. We made sure the screws would be hidden by the column by spacing them within 3 inches of the center of the 1 x 8 since the diameter of the column is 6 inches.

Securing the 1 x 8

Good thing I paid attention in high school geometry just enough to remember the basics of radius and diameter. Although lingering nightmares about isosceles triangles and proofs still invade my brain at night. Weird stuff!

Anyhow, the column base construction was a HUGE success. Here’s the final look. Of course I’ll prime and paint the base as well as the column (just as soon as it stops raining here in Pittsburgh, which could be never).

Final Look of Column Base

 

What’s Next

This project began when I decided to inspect the front porch columns – good thing I did!

Grab our free guide if you’re doing a DIY bathroom remodel – it shares how to remodel a bathroom in 10 days or less

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Thanks as always for reading, watching, and being part of our awesome community.

Ask your questions below and we’d be happy to help.

Cheers,

Jeff Patterson

 

 

 

 

P.S. Our online store has great supplies for homeowners doing a bathroom remodel. You’ll find shower systems, tiling tools, and more.

11 Comments
  1. Nice work. I can’t believe how the original had that hollow spot beneath the column. It seems there wasn’t much wood truly supporting the load. I’m looking forward to hearing how you jacked up the porch roof up.

    I think the most important, unmentioned lesson I’m taking from your post is the proper attire for visiting a lumber yard. By comparison, embarrassingly, I have failed miserably in my own attempts at professional DIY-mans-ship, only showing up in paint spattered t-shirts and threadbare cargo shorts, with sawdust in my uncombed hair and perhaps a bleeding knuckle wound. I don’t think I’ve even managed to show up with a shirt with one button, much less a long-sleeve Oxford, pleated slacks, and a tie (?!!!). Kudos to you sir.

    1. John, you crack me up big time-LOL. Don’t worry, I’m not normally dressed like this when visiting lumber yards or hardware stores. That pic was taken after I finished work but before making it home to change.

      It was shocking to see the little pieces of wood that were supporting the porch column. I’m talking literally less than 1/2 inch on the four sides of the old bases. And to make matters worse the wood wasn’t even pressure treated!!! The new setup is way sturdier and should last a good while. Jacking up the roof was totally stressful for me since I’ve never done it before. But it went better than expected, which means I lived and the porch got fixed. Haha.

      🙂

      Jeff

  2. Carol says:

    Ack, I read that whole post with great anticipation – waiting for the finale – to find out how you got that new base in place?! And I was left hanging – I can’t find a subsequent post on jacking up the right corner of the porch in order to insert the new base. Did you ever post the follow-up? Thanks!

    1. I didn’t do the post Carol. Only because I was afraid to show everyone how I did it. I was afraid someone might do it wrong or get hurt.

      How big is your porch roof?

  3. John says:

    This post was super helpful and I thought I was looking at my exact columns when I saw your first picture of the hollow bottom. I also am curious how you jacked up the front roof to put the new base into place. My front entry roof is rather small only 8ft x 4ft so theres not too much weight but I can’t find a solution anywhere. Thanks!

  4. Dom says:

    Great post. Excellent pics! My deepest sympathies for the critical and unsupportive honey. You may wanna replace that rotten pillar before the house comes down on you. You seem like a tool that is work special treatment;) IE cleaned, lubed and batteries recharged daily. PeaceB2U.

  5. MoneySever says:

    Thanks for information. What did you do about supporting the porch while base was removed?

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  7. New Home says:

    I have the same problem. The builder use wrong seal and water get inside wood. Now builder offer to use fire to melt a layer of wax on top of wood and try to sand it and paint it. Do u know should I accept builder’s repair solution. Should I force builder to use pressure wood? Thanks.

  8. Kevin says:

    Hi Jeff, I have exactly the same problem with 3 post on my front porch, Fourtuntlely, they are not load bearing and only decorative. I need 3 of them repaired at the bottom or replaced with fiberglass columns. I’m in Pitssburgh and looking to pay someone to come repair or replace mine or help me. If your interested please contact me, Thanks.

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