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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!

Marc

Saturday 14th of May 2022

Hi Joshua, your project was very well explained and detailed so any DIY would be confident to proceed with this project. I do have a question regarding laying the 2x4’s flat using plastic spacers. My project is a10 x14 floating deck over a cement patio. If I were to lay my 2x4’s flat am I compromising the support when laying my deck planks? Most decks I’ve been reading have the boards on edge which gives a stronger support for decking. What do you think?

Sheila

Tuesday 10th of May 2022

I love it looks great. Would you please share pictures of your stairs?

Nadine

Tuesday 19th of October 2021

Joshua and Chels.....I love your idea of using PVC trim cut into special size pieces for the spacers under the sleepers. I have been wanting to make our cement patio look cozier for a few years now. Have researched painting, resurfacing, covering with decking, and other. Nothing I have looked into has piqued my interest for varying reasons. But now after seeing your genius method my mind is made up. Thanks for posting.

Joshua Rief

Thursday 21st of October 2021

That's wonderful to hear, Nadine! So glad, and hope it works out great for you!

Tim C

Friday 8th of October 2021

Looks great, and well written. I do have a question about the sleepers. Sleepers are typically strong because their full surface is resting upon the surface below. Having raised the sleepers on spacers, you are effectively using a 2x4 horizontally as a joist, with the span being the space between the spacers. I would think this would sag under weight, and while it can't sag far due to the proximity of the floor beneath, it can. If I were to do this, I think I'd either use a lot more spacers, or something continuous.

Joshua Rief

Sunday 23rd of January 2022

@corey, thanks! I overhung them just a bit. I can't recall the exact measurement, but it wasn't much - maybe half an inch? Something like that? Wanted to ensure that the water running off the underlying concrete would be able to flow out and under the face boards. Hope that helps!

corey

Monday 17th of January 2022

@Joshua Rief, great job, I am inspired to give this a go in front of my house. a question about the sleepers, did you over hang them off the front a bit or are the flush? when you attached the face boards are they flush with the block? thanks again

Joshua Rief

Monday 11th of October 2021

Hi, Tim - thanks! Right - my concern with using something continuous is that I didn't want to create anywhere for water to pool or not run out. Certainly could see the argument for using more spacers, though. In our case, the front deck has been up since 2016, and the back deck since 2017, and we haven't experienced any sagging of any kind - so far, so good!

Ed

Sunday 22nd of August 2021

Did you readjust your door seal before wood deck install. I mean you’ve raised the floor height to like 2 5/8s?

Joshua Rief

Sunday 5th of September 2021

Hi, Ed - no, I didn't. The drop from the door to the cement was pretty dramatic already, so adding the wood didn't bring it up over the level of the door seal. Is that what you meant?