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DIY: Turning a Cement Porch Into a Wood Deck

If you’ve ever thought about turning your cement porch into a wood deck, it’s surprisingly easy! Here are some thoughts, tips, & photos from our experience!

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

One of the “little” projects that’s been on my to-do list for quite awhile (there are so many!) is recovering our front porch. Like every other front porch in our housing development (and, come to think of it, every front porch on every house or apartment we’ve ever lived in), it’s made of cement (okay, technically concrete, but whatever…). While a cement porch is obviously rock solid and virtually maintenance free, it’s not homey, attractive, or inviting. Chels in particular really is not a fan of the way concrete feels on bare feet, especially the particular kind typically used for this application, which has lots of little pebbles and what-have-you mixed in.

So, for the first two years we lived here, the result was that no one spent any time on our front porch.

In fact, because we didn’t spend any time out there, I just assumed the space was really too small to do anything with anyway. When Chels and I started discussing the particulars of what we wanted to do in the backyard, and researching the feasibility of building a wooden deck atop an existing cement patio, the lightbulb went off for her, and she asked me, “Why couldn’t you do this on the front porch, too?” So, I went out and measured the porch. As it turned out, it was over 120 sq ft! Plenty of space to hang out, put out a bench and a table, and so on. I decided this “small” project would be a great dry run for the considerably larger (~300 sq ft) back patio I wanted to tackle later in the summer. 

I had then checked a lot of different DIY sites for tutorials and ideas, and while it’s very unlikely that any particular resource is going to outline exactly the project you are trying to get done, by pulling together ideas from quite a few, I was able to get an idea of the way I wanted to go. Of all the sites I consulted, this article from The Family Handyman was by far the most helpful and comprehensive.

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

Materials & Cost

I used the following materials for this project:

  • (16) pressure-treated 6 ft 2×4’s
  • (35) kiln-dried Douglas Fir 8 ft 2×6’s
  • (2) 12 ft 1×2 PVC planks
  • (4) pressure-treated 8 ft 2×4’s
  • 2.5″ deck screws
  • 3″ masonry screws
  • 100 ft of flashing tape
  • 1 gal waterproofing deck stain

I did purchase a few other things that you may already have lying around – some fresh masonry hammer drill bits, a new stain brush, and some deck wash. And, of course, if you don’t already have a hammer drill and an impact driver, you’re going to need those (neither is very expensive)! Altogether, this project ran me about $475. I did take one shortcut, and only time will tell if I’ll come to regret it! The biggest expense here, of course, is the decking itself. Because my porch is covered, and on the side of the house that gets the least rain and wind exposure, I decided to only go with pressure-treated wood for the sleepers (the foundation, if you will – we’ll get to that in a minute) and the trim. For the actual decking surface, I went with kiln-dried fir, which, I’m told, other than cedar and pressure-treated wood, has one of the highest tolerances to weather. And then, of course, I waterproofed it. But, this is Oregon. So we’ll see. The boards are installed in such a way that they would be very easy for me to replace one-off if needed, but hopefully it won’t come to that, at least not anytime soon. Consider this my own personal experiment…if you want to be totally assured that your deck will last a long, long time, obviously use pressure-treated wood or composite decking. When I do my back patio, which is not covered and takes a beating every winter, I will absolutely have to!

Sleepers

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

“Sleepers” are, apparently, the name for the beams supporting the deck surface, laid directly atop the concrete. They run perpendicular to the actual deck boards, and elevate the surface slightly, allowing the decking to avoid contact with the ground. Additionally, when the sleepers themselves are elevated slightly with small PVC spacers, as we chose to do, none of the project’s wood is in contact with the ground, and any rain or water that might run off or under the deck boards flows right out without sitting under or pooling around any of the wood structure.

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

For the PVC spacers, I bought 12-foot pieces of PVC trim, and cut them into 3 1/2-inch pieces, three to a sleeper (my sleepers were only six feet long – with a wider porch or patio, you would want to use more, of course. With the spacers under the sleepers, the total thickness of the sleeper is increased to about two inches, and you want your masonry screw to penetrate the concrete by at least an inch. For this application, I used 3 1/2-inch long masonry screws, for which I predrilled holes that were about 1 3/4-inch deep.

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

After securing each sleeper with three masonry screws (one through each spacer), they were pretty rock solid (well, one was a little iffy because of where it was sitting – I borrowed the kids’ sidewalk chalk to write a warning message on it – DO NOT STEP!). Our 20-ish foot long porch needed 16 sleepers spaced 16 inches apart.

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

As a final weather-proofing step, I took Family Handyman‘s advice and covered each sleeper in flashing tape. You could save around $50 by skipping this step, but as water drains through the slats in your decking, it inevitably ends up…on top of the sleepers. With the flashing tape, the water runs off the deck, onto the flashing tape, and then off onto the cement, while the sleeper itself stays nice and dry. To avoid any water pooling between the decking and the sleepers, this seemed like a worthwhile step to me.

Decking

To me, laying the sleepers was the most challenging part of this project. Drilling into cement and working with masonry screws is a lot harder than working with wood, and once that part was done, the rest seemed easy. The rest, of course, is laying the decking. My 2×6’s were eight feet long, so it was mostly just a matter of making sure anywhere a deck board ended was in the center of sleeper. Given that the sleepers are 16 inches apart, center to center, that actually isn’t too hard to do with eight-foot boards. You’ll end up with some funky recurring measurements, to be sure, especially if, like our porch, you find it’s actually a little over 20 feet long, so nothing is quite even. I left about a 1/4-inch gap between each row of boards.

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

I put two deck screws in wherever the deck boards ended on or crossed over a sleeper. I’m sure this goes without saying, but in case there are still any deck screws out there with a phillips head – don’t buy them. Get the star drive screws! No stripping, no slipping – so much better. Also, use an impact driver, as I mentioned at the beginning of this post. If you don’t have one, buy one – they aren’t very expensive, and you’ll wonder how you ever lived without one. Believe it or not, the first time I had ever used an impact driver was last year on a Habitat for Humanity build, and I remember just thinking the whole time…I gotta get me one of these… For anyone that’s done a lot of decking or roofing, that’s probably unimaginable, but for me it was revolutionary, and my little cordless Ryobi impact driver has quickly become one of my favorite tools.

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

I finished off the deck surface with a trim of 2×4’s to cover the ends of the sleepers, and that was it! The deck was in! The remaining steps were all pretty simple, if a bit time-consuming. First, I washed the deck with some wood deck cleaner, just to remove any leftover residue from processing. Next, I masked off my house and pillars and put down a couple of thin coats of waterproofing deck stain (getting that stuff into the cracks between the boards is a PAIN – if anyone knows a good way to do that, please do share!). Finally, I used a couple of pressure-treated 2×4’s to create a small trim border around the base of each pillar, giving the whole thing more of a finished look (haven’t stained those yet, but I probably will).

Note: There are some great comments from readers at the end of this post about ways to get the strain in-between the boards, from staining the sides ahead of time, to using some nifty purpose-built tools. Good ideas!

If you've ever thought about turning your cement porch into a wood deck, it's surprisingly easy! Here are some thoughts, tips, & photos from our experience!

Chels prettied the space up with this inexpensive but very smooth and comfortable little porch glider, half a whiskey barrel turned upside down for a table, and some outdoor pillows and silk flowers. It’s become a really attractive space, hopefully given us a bit of extra curb appeal, and, most importantly, we hang out there now! Without a doubt, our little front porch has gotten more use in the two or three months since we finished this project than it got in the whole two years we lived here before that!

Here are some more of our DIY projects – check them out!

If you have any questions or comments (or tips!), please comment below and let me know – thank you!

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Neil

Wednesday 23rd of September 2020

Joshua, Very nice job on the front porch. I also like that fact that you response to all of the comments. Very positive! My wife and I are remodeling a Dutch Colonial built in 1895 that is mostly mountain stone. We have a fairly large slate stone patio encased in mountain stone retaining walls that is capped with slate. I also have mountain stone risers with slate steps going down. The slate is flaking real bad and some of the stones are breaking up. My plan is to pull all of the slate stones and build a recessed wood deck so that the deck surface is flush with the top of the mountain stone retaining wall. I am going to pour concrete footer for the base and build up off of them for the deck. I have a pretty good plan for that. But, I also want to replace the steps with wood. Was considering doing what you have done by pulling the slate tops (they are cracked and flaking), pouring concrete steps and encasing them with in wood. I want the steps to be solid with no give in them climbing. I figured the concrete would be able to provide that. I am going to finish the entire wood deck and stairs in a Shou Sugi Ban - inspired finish (Wood burning with a dark stain). The deck rails will be done in the same finish with black metal spindles. I am just wavering on how best to construct the steps without wasting money. Any suggesting is greatly appreciated.

Joshua Rief

Saturday 10th of October 2020

Neil, my apologies - we were on vacation when you made this comment, and I missed it coming in! Thanks for the encouraging words - much appreciated. As to your project, it sounds incredible and challenging! I have no experience working with stone, which, to me, seems intimidating! But your plan sounds great. On the steps, I would totally agree - if you pour concrete and build the steps over them with sleepers and pressure-treated lumber, they will be totally solid. The two decks and one set of steps we have built here over concrete are as solid as anything you could hope for - absolutely no give or bowing whatsoever. Have been quite pleased with the result.

Laura

Wednesday 16th of September 2020

This looks fantastic! Question: how would you handle the blocks of the porch was not level. I ask because I’ve been considering doing this to my front porch, but in some spots the cement has cracked and shifted (then was patched by previous owner). But it’s not level in some spots. How would you compensate for something like this? Thanks!

Joshua Rief

Saturday 19th of September 2020

Hi, Laura - that's an interesting question for sure. If you have the flexibility to raise the wood deck covering a little higher than just the sleepers would, I would use the technique I used on the back deck (there's another post on that one), which gives you the ability to cut blocks of different heights to even out an unlevel surface. Would your porch allow for a little extra height? The other option I can think of is layering the little PVC blocks to even out the unlevel sections. You can buy the PVC in several different widths, which might help, too.

JOHN COKOS

Wednesday 26th of August 2020

Good approach to the situation of the concrete deck..I did a low budget work around for a front step by applying a piece of silver foil insulation and glueing it down with panel adhesive, then glue and adereing a pre cut and assembled tongue and grove deck that I made with my brad nailer and adhesive. So far so good, took out all the unevenness of the concrete step and absorbs the shock of foot traffic...

Joshua Rief

Thursday 27th of August 2020

Thanks, John! That is a clever fix!

Niki-Dee

Friday 12th of June 2020

This is such an awesome step by step tutorial!! I have been suggesting to my fiance that we cover our cement porch with wood for years and he wasn't convinced until I found your page! Wonderful job, Thank you for the details and beautiful photos .

Joshua Rief

Friday 12th of June 2020

Thanks, Niki-Dee! So glad you found it helpful, and best of luck!

Gregory

Sunday 31st of May 2020

The 2 X 4s you used to cover the end of the sleepers, did you need to screw them into the concert or end of the sleepers? I have a duplex and planning on doing something similar just on my side. Unfortunately I have steps I will have to cover in wood somehow as well.

Joshua Rief

Sunday 31st of May 2020

Hi, Gregory - the 2x4's were just screwed into the ends of the sleepers (and the deck boards as well). The steps could be challenging, but, in theory, if you end up raising the step the same amount you are raising the deck, it might work out okay (I ended up having to add a purely wooden step to mine to compensate for the height).

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