How To Build A Deck Over A Concrete Slab
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- เผยแพร่เมื่อ 1 ก.ค. 2024
- In this video I am going to show you how to build a deck right over an existing concrete slab! If you have a concrete slab that is in good shape it is very easy to build your deck right on top of it. A few things to consider with a deck build like this, but overall it is very easy to build a deck right over the concrete slab!
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What about the moisture between the concrete and wood joists when it rains?
I notice from the other comments that you said the concrete will be dry because of the roof. I just want to warn that concrete can absorb water from the ground and air. I live in a very humid area where the water table is very high. Despite our concrete area having a roof it still got wet enough to rot the wood! It appears that you used treated wood unlike our builder 30 years ago. You should definitely emphasize that in your next video! I'm going to redo ours with treated wood but I think I am going to play it safe and seal the concrete and add a drain tile. Thanks for the video!
Just what I was looking for! Thank you!
Awesome!!
I can vouch for the treated lumber laying on the slab. I did this 25 years ago to my patio. The wood is still rock solid. Nice video!
That won’t stop the haters 🤣🤣 I appreciate it my friend!
@@THEpremieroutdoor I'm pretty noob about the woodworking. What kind of treated lumber you used on the slab? H3, H4 or H5? I'm trying to do the same but not sure which one i should use. Thanks for your advice.
I've also done treated lumber over pad 12 years ago still looks new. Treated is treated, but I can say that it will have a reaction to aluminum
@@THEpremieroutdoornah I wouldn’t call them haters, I prefer the term, ‘more informed’ !
Would you happen to have a general list of tools and supplies needed for this?
Nice work Men,congrats
Matheus e Renata Mayer Farias thank you!!
you rock! Thanks!
Nice job.
Will this work the same way with 2x2 deck joists over a small concrete porch? Awesome video!
What brackets do you use to fasten the substructure to the concrete slab?
Thanks for the ideas. I just redid my 20 yr old 2nd floor deck in Trex and I was wondering about doing this underneath over the patio, to match. I was questioning whether I would attach my joists through the cement base of the house but keeping it all independent of the house and 6x6 deck supports makes things easier. I put in the plastic between joists above to keep things dry so this should be pretty nice.
Thanks for the videos. I have a question on deck footers. I’m building an elevated deck and plan to have exposed aggregate concrete patio below the deck. My deck footers will be 12” sonotubes 42” deep. Because the look of the concrete footer tops will be different than colored exposed aggregate slab, I’m afraid it’ll look ugly. So, how do I hide the top of the footer? What kind of interface should I have between the footer and slab? Thanks!
I'm getting ready to build my deck ( over a concrete slab ), and this is going to make things a lot easier.
Did you make a video about putting the decking on and the finished product?
You just got a new sub.
Awesome video. Will definitely use this setup for my deck. But. Our slab is kind of sinking on one side due to an old well. We filled the well and have another well pump away from the house. So the patio is in not so good shape and has a big crack. How would I do this over a slab that's in not so good shape?
Sick video dude. I'm looking for your professional opinion on a deck build. I have a concrete back porch that is expected to be covered and leveled by using pressure treated 2x4s. Shimming is going to be required un ordered to level the 2x4s which are acting as joists, since the concrete has a grade to it. What would you use to shim, and would you nail the 2x4s to the concrete since the are extending out to meet the rest of the deck that extends off of the back porch?
I painted all joists with black jack on the area resting on the slab, no water can penetrate that, good luck with your deck!
Thanks!
very unusual to lay timber deck directly onto concrete like that, normally a gap would be left so as not to create a friendly environment for fungi, bugs etc. Any time you can avoid creating a tight seam with timber outdoors you should. Even when i am bolting timber to concrete outdoors i will place washers between timber and slab to allow rain to flow down, this also avoids a nasty dirt trap .
So what do you suggest be placed between the frame and the concrete?
@@krazyboutkeekee92joists….
Ive read alot of the comments.
I too was taught not to sit lumber on top of concrete.
I also get what you are saying, but honesty that pergola stops the lions share of water but that deck will still get pretty wet and water will go under the deck. So how long will it last this way?
Will the wood be susceptible to rotting as it is sitting directly on the concrete. I have a concrete slab under my Alfresco and when it rains with the wind blowing the rain on a angle. The water pools in certain areas on the slab. Would it be wise to have the deck frame propped up on galvanized or stainless spacers to keep the wood of the concrete. ?
Good job
Don’t you think to raise up the base frame from surface to avoid timber from rotting ?
its a must
I agree. He now has 20+ joists just sitting on the concrete. In a couple of months, the dirt, bugs, and slimes will clog the tiny gaps between the slab and the joists. Then each section becomes a water trap, the bottom of the joists will I've never heard pressure treated lumber is designed for immersion, and it is not considered water resistant. PTL only Rot resistant. You might get away with it in Arizona or So. Cal, but Jersey?
I couldn’t watch it with the background music making it hard to hear his voice well.
I agree, i have seen numerous tricks. Shingles for spacing and rot issues or they make spacers. Also most videos dont talk about the taper from house for water run off. Everything else looked good they did.
Хорошая работа.
Muchas gracias 😊 thank you 😊 very much
This is an awesome build. I need my deck to be really low to the ground...has anyone heard of tuffblocks? They look like they'd do the trick!
I'm looking to build a deck over a slab in my backyard but there are stairs (2 steps) right outside of the sliding glass door and about 4' of dirt between the slab and the house on both the left and right side of the stairs, would just throwing precast deck blocks down be stable on both the slab and dirt? (i'd be doing this to clear the stairs)
Lumbar joists laid directly over concrete? I can see how this might work with a composite deck but I imagine, lumber, even PT, with no run-offs or drains would, IMHO rot if you live in areas prone to frequent rain? A lumbar deck installed over composite joists might work. I have no idea if one can nail/screw lumbar onto composite joists, as I haven't done it myself. I'm not a carpenter, just a DIY enthusiast. I would be very interested to know if anyone has and how it turned out.
Good vid. Thanks.
Glad you liked it!
Bing, Bang, Boom another Fantastic video!! I never even thought about the movement in the slab opposed to the rest of the structure. So basically you guys are gonna make sure it's level and just anchor it to the slab as a precaution. As heavy as that deck is, it's not bound to slide out of place. And I mean this wit da utmost Respect, PLEASE don't remove your hat & sunglasses when speaking to the camera. It freaked me out.. JK,JK,JK Bud!! Hoping all is well, have a Blessed 2020 & Dirty Jersey out!!
Money Making Mike G. Hahaha that freaks me out as well. Yup, independent movement!
Any suggestions for building a deck on a sloped driveway so it's level?
When doing this do you always extend the slab? or could you just extend the framing and use shallow footings/blocks (above frost line)?
I’m wondering the same thing.
Hi POL. Instead of using what appears to be 2 x 8s for the joists and frame, could you use 2 x 4s if you did not want the deck to sit up as high? Not as rigid a structure perhaps? Thanks, Brad
Do the support posts for the pergola just sit on the pad or did you cut and install piles?
What do you do if the slab is not perfectly leveled? It’s an old slab, no cracks but gained a bit of a slope over the years. Was thinking on using plastic joist pedestals. :/
So it'll be okay from water and termites sitting directly on the ground? I'm considering pressure treated redwood. That would be good enough to deter any termites?
I enjoyed watching your installation I’m doing this too at my house and will fasten it to the floor with tapcons 😎👍🤩
Nice! Tap cons certainly won’t hurt!
What are tapcones? I didn't see how the decking actually connects to the patio slab. Help!
My slab has some cracks in it. Will I need to rip it up? Is it cheaper to put in wood for it or concrete? It's for my front porch. What are your thoughts of a pergola over a wooden or concrete front porch instead of a portico?
Use kleverklip brackets 👍
Do you have a video of the rest of the work? This video was super useful!!
Yup! You can scroll back through our videos and find a few more on this project
@@THEpremieroutdoor you’re awesome. Do you have an email I can reach out to you through if I have more questions? Thanks so much!!
We're looking to do this and to extend it out past our concrete slab - so part of the deck will be elevated up several feet, and part will be on the slab - is the process the same?
did you use pressure treated lumbar for the framing?
Should a deck be tied to the house if Half of the deck is on a 10’ x 10’ concrete slab and the other 10’ half is not on the slab and will be approximately 10” above the ground sitting on concreted 6 x 6’s? We have a 10 x 10 concrete slab, we have an area for 10 x 20 so we want a 10 x 20 deck to fill out the whole area.
I would think L brackets on the slab to the joists and then tying it in to the 6x6’s would be plenty solid. Cookie cutter end unit town house built in 1995 in south eastern Pennsylvania.
Any thoughts? Thanks!
Can I use joist hangers to connect the joist?
How do you handle water from raining if your deck is on a concrete slab?
Will the wood deteriorate faster if sitting on cement?
they use ground contact rated pressure treated wood. But yes overall it will decay sooner. Still many many years of service.
@@mikez4132 I put block paving bricks under the frame to keep the wood off the wet concrete. stops the frame from sitting in puddles after the rain - it lasted 20 years. I am just replacing it to make it bigger
Yes it will.
What can you do about not blocking the door. I can't do a sliding door.
Very informative! I have a smaller patio that is roughly 8" x 10", and the slab is not flat, it slowly grades downwards and is off level by probably 2-3 inches at the most. Is there a way I can even up the frame without having to modify the slab? I thought maybe I could put something under the corner of the frame but that seems like a temporary fix.
Thanks for the time and content!
8" x 10" is pretty small!
You want some fall for water run off. I think the rule is 1/8 inch per foot.
Great video. Got a question, how would you do a raised deck over the slab? Say maybe 2ft.
Cut holes in the slab for footings to be dug. Unless the slab was poured with footers dug and filled with concrete in the areas of the posts ahead of time.
Hey man could you use 4X4s as posts if the slab is uneven throughout its area?
You could but it’s better to have it bearing evenly across the concrete, you can taper your joists so that the deck ends up flat
Do you find that your wood is stiffer first thing in the morning as opposed to later in the day? Asking for a friend.
Jonathan Yates as it is typically colder in the morning hours the wood will be much stiffer and less pliable, great question!
@@THEpremieroutdoor that's called morning wood
@@Mannina90😂😂😂
Wait!! What did you mean about the lags? I want to do this on my covered patio. What secures the feck to concrete bottom? And how. Great video but i need the last part
I took that to mean that the weight of all the lumber was going to basically keep it in place. They'd use a few L brackets to attach the wood to the concrete just to be sure it didn't move.
I want to put a floating deck over a concrete patio but it has to be 21” from the concrete to the deck surface so the deck will be only one step down from my back door. The deck will not be attached to the house. Can I anchor 6 x 6 posts to the concrete and build the deck on them as I would on footers?
My oh my all these people complaining about the deck sitting on concrete and rot. It's pressure treated lumber which protects against rot, decay and insects. It can sit on concrete no problem. If you're that worried, add deck guard to the bottom.
Do you need cross cement spacer block?
There is a 1 foot drop from the back door to the pre-existing slab. Makes this job easier.
Awesome video, just what I was looking for. To save $$$ on materials, s it okay to use 2x4s for joists? If not, what is minimum recommended size, 2x6, 2x8?
2x4 is fine if it is sitting on concrete!
@@THEpremieroutdoor Excellent! thanks
I need to do a decking over concrete. How do I ensure that the frame is off the ground such that water does not accumulate when it rains?
A 2x6 sitting on the ground is going to seal enough to accumulate later. It will drain because of the nature of the wood and concrete under it.
You are going to have that frame in direct contact with the concrete. Isn't that going to rot eventually and crumble down? And what about water drainage from all the blocks?
Varun Daid all the lumber is graded for ground contact and all the water drains right off the edge of the patio
@@THEpremieroutdoor for everyone's benefit, what would that rating be? H3/H4/H5?
It contains .14 of micronized copper azole...above ground contact lumber has a concentration of .05
@@THEpremieroutdoor I hope my local green box store are able to decipher that for me.
If I were to put shims / window packers underneath the frame to avoid ground contact, what do you reckon should be the max distance between the shims for optimum stability? And should I just place the shims or do I fix these to frame using nails/screws?
Sorry, too many questions. :)
I’d just make sure you buy lumber that is rated for ground contact because even if it is elevated with shims there will be no airflow so you need a higher preservative concentration
I didn’t realise one republic were laying decking these days
I think you mean one direction, and thank you they are my favorite band!!
Hi there. Great video! We have a concrete patio that we want to build a deck on top of. The patio is original to the house - 30 years old and has the odd surface crack in it. Are there any tips you can give us so we know if its sturdy enough to build on please? Big fan, from New Zealand! Thanks, Brent
Hi, non-expert here. If slab is still flat, and 4" thick, you should be fine, especially if joists are resting on concrete (as opposed to attaching frame to not-enough posts). Even if slab is less than 4" you'd probably not have any problems. I asked my goto construction guy about maneuvering my 1-ton scissor lift on sidewalk panels that I know were not poured properly and are only 2" thick. He told me the concrete wouldn't even notice, although I still plan on putting 3/4" plywood sheets down over the panels for lift operations.
@@ubomninomen7765 fantastic answer!! Thank you so much for your help, really appreciate it. Stay safe :)
What type of wood are you using
What about airflow between the joists? Is that something to be concerned about?
Not a bad idea to have the joists slightly elevated for airflow but this got a pergola cover on top so it will stay dry
@@THEpremieroutdoor it seems like you are going to keep a tarp on your pergola every time it rains
Were is the water going if it's sitting flat on the concrete?
Could I use 4x1 for base
You don’t have to put something between the wood and the concrete?
That’s a good idea to do, but this was getting a solid pergola cover over top so it will be kept dry
First off, love your channel, and have watched all your videos. Question time: stepping out of my house onto my concrete slab is only about 6 inches. Is it possible and up to code to frame a small landing area over the concrete (12' x 12') using 2x4's? Thanks in advance and keep up the great work!
You could use 2 x4s. But you would have to do 12 inches on center instead of 16.
What do you do to the gap between the siding and the new raised deck?
We leave a tiny gap so they can be Independant from each other
I've got a slab with just over about 4" of clearance to the doorway. Could I do this with 2x4s instead of 2x6s?
Have the same question. The slab is at most 4” under the patio door closure, and thinking I may have to demo the slab before starting.
Could you use 4x4's or sister a couple 2x's to add a bit more strength?
Wont it just rot out sitting tight to the slab?
Mr. November it’s all rated for ground contact
@@THEpremieroutdoor Thank you. That’s great to know,
Yes. Within 8-10 years.
Is there a part one to this? Where you sank the vertical posts for the cover?
@@alitlweird I'd think about raising on some unistrut at least. Something other than nothing. I'm not into building for 8-10 years. Replacing the deck boards is one thing.
Love your videos man! Would you recommend staining or painting the frame before installing the decking?
Do you have to put anything in between the wood and concrete ?
G that’s why I watched, see if tarp placed down or even if screw wood to concrete, but they just seemed to move on from that.
Still no answer from the creator
We did not. Make sure you are using pressure treated lumber that is rated for ground contact. You can also use shims underneath the framing to elevate it slightly. This project ended up getting a waterproof cover over the pergola so that was not much of a concern here
Definately need a gap between the concrete and timber. The joists will eventually rot , roof over and treated timber wont prevent it.
I disagree
@@THEpremieroutdoor Oki doki then.
Not a pro
Hi may i ask what are you supposed to do if the concrete slab is slightly sloping away from the house? i.e. if the concrete is somewhat un-level - what can be done?
thanks
I would build the deck with a slight fall away from the house so any water runs away from the house eg windy condition
Hey man I love the videos. I want to do a similar smaller deck over my old concrete patio however the concrete is uneven, so I will need to use some short 4x4s or something to make the deck frame even. My question is what is the way to attach these supports to the concrete slab?
Hey Boss. What sixe nails you got in that nail gun?
3 1/4
I bought my detached house in 2015. It has a wrap around above ground deck. On the left side they had built an extension. The previous owner did a wooden deck over the concrete surface.😱 In between the wood and concrete they used ROOF SHINGLES.🤔 The deck was built in 1995. Now I don't know what materials they had back then in terms of building materials but long story short. I have to RIP out that whole side of the deck! 🙈It's all rotten. It looks stable but it definetly is not!🙏 I came across this problem when I saw a leak in the basement.it looks like the concrete is breaking down. Now I have to pour new concrete,fix the cracks and figure out if it's worth putting a deck back on top of the concrete.👺 Its definetly not going to be roof shingles and wood I'll tell you that much!🧐 Lesson learned theres no way you can put wood on top of concrete.👊Especially living in Brampton, ontario where we live in zone 5. It does rotten. My wood looks like composite/mulch With the dirt and leaves in between the wood. It's great mulch for my pine trees and cedar trees that's for sure!👏 I hope my comment was very informative. I witnessed this with my own two 👀 not by word of mouth🙌
Is this code universally in the US?
Please come and do my backyard
I would have recommended to build the deck level and allow water to freely drain off the concrete below... Wood decks do not need to slope, as water will not puddle. You have made too much surface contact with the concrete, I think.
Does the deck needs to be sloped for drainage?
No, it must be leveled
I been planning on doing this, i was told I needed a sponge like product underneath the wood. Is that true?
I definitely wouldn’t put anything underneath that will hold moisture
@@THEpremieroutdoor yes, sorry, i ment more like a plastic window packer. Just couldn't think of it. Thanks for your response.
Seems like if you hosed off the deck or rain blew onto it, the water has no way to drain and would end up rotting out the wood.. I don’t see where you drilled any holes for drainage.
wood joist against concrete? lots of pooling and fast roting
Sounds like an old Bart Simpson
:24 seconds in I was wondering why the dude in the back wasn't wearing any pants.
Timber will rot. Needs to be lifted so it doesn't sit in water.
If you switch the unnecessary music off, might help. Thanks
that guy pat is a bad dude
absolute freak
He’s a straight up beast!
The music is awful, otherwise a good video.
Haha thanks max!
@@THEpremieroutdoor Agreed! Music is distracting.
Tell your boy with the camera that he doesn't have to keep it on you the whole time... If you're talking about something visual we need to see it..
Yeah, ole' dude just talked NOT showing how to do the job. He's in love with himself.
Did I just here “Pergela”....my man it’s (Per)-(gola) as in Gol!, Gol!, Gol-a!
Wow! This should be titled how NOT to deck over a cement slab! Let’s start with did you at least seal coat the slab?? Also you didn’t use a vapor barrier at all and what about ventilation?? This job will definitely be getting a call back!! Another fine example of a so called contractor screwing things up and making it bad for the rest of us..
Thanks
Thanks for the comment hotshot. With a pergola cover over top keeping the deck completely dry I think this will be 100% fine. Also using lumber treated for ground contact has me not worried in the least
Premier Outdoor Living Hot shot huh? Okay we’ll live and learn... it’s not just about the lumber rotting it’s also all of the other things that are going to be happening under there. You think it’s ok just because it’s covered but that is the least of the problems. Like I said it’s guys like you who give the rest of us a bad name...
I guess we’ll see about that hotshot
Premier Outdoor Living sorry we got off this way but even using treated lumber the wood is going to continue to leach moisture to the wood if you would have at least sealed it or used plastic shims to keep it off there that would have been a start? But it’s not just the wood, it’s the cement also... where it’s constantly exposed to moisture it can pop! Break out! Know one will even know it until it’s to late. It’s called mineral leaching. Please don’t hate me but take the time to research it for yourself so you don’t do it again???? I am all about helping others be better at what they do and I apologize for how I came across. But seriously look into what I’m telling you. One last thing I didn’t say before, your Pergola turned out Great! It’s easy to get caught up in the dark side on you tube. For that I am sorry...
Mark
Haha thank you mark, step away from the dark side my friend. I agree there are always better ways to build, I appreciate the tips
Putting timber hard down onto concrete with no DPM? 😫 That ain't gonna last long
The video is pretty good but just emit the music it sucks n makes it hard to hear you.
Wood won't dry on slab. It will rot lol duhhh
I guess you’re a pro there hotshot
Impossible to watch with that chipmunk music in the background. Good luck to ya.
thats going to rot out in less than 5 yeas
Why do people play music over their voice so you can hardly hear them?
Never sit joists straight down on concrete 👎
Oh god no!!! What do I do now?!?
Premier Outdoor Living I’m so sorry 😂 my dad is using my TH-cam account but i asked him and its not good news he said it’s gunna Rot and u need to take it all up and do it again , probably not the news u was looking for so good luck 🙏
Turn your music off can t understand a word of explaining.
I could not hear due to the ignorant music.
You can always mute it if you'd like!