It always helps to either saw the joint between the slabs or to ensure that the joint is clean. Any debris or friction between the slabs can reduce or even prevent movement. I've even seen slabs break just because the joint wasn't cleaned.
The guys who make a living slab-jacking are not going to approve of this as it will diminish their work and absurdly high prices. I used this method 4 years ago to for (2) 36" sidewalk slabs. Rain, feeeze, thaw, snow in NE and hasnt moved an inch.
Thank you for sharing! I am in the NE of Ohio, and mine also hasn't moved an inch for over a year. Before this foam concrete lifting project, I paid a concrete leveling company to level this sidewalk, but the slabs started sinking after 6 months.
I thought about trying this but wasn’t sure it would have enough force to lift it. Pretty cool. I ended up using chains and bottle jacks to lift the slab and poured concrete underneath.
I’ve used it where if you can pry up a sunken section to level then, you can spray foam the void, once solidified remove pry wedge… also same as in video not with the intention of lifting the slab but filling in the void under the slab where the gravel/pebble/sand has washed away over the years. The spray foam will stop further settling sometimes that’s the only option if you can not manual pry the section to level.
I thought about this the other day and didn't know if canned foam would actually lift concrete, but it damn sure does. not sure it will work in my situation but it gives me hope
I had this idea re: great stuff but wasn’t sure if it would work ..thanks for videoing how to do it & that it does indeed work! Need to lift a sunken concrete slab on 1 end in my backyard that some contractor gave me a usurious estimate ( over $1100.) to break up & replace the 1 slab that is otherwise intact & stable .glad I you tube-googled slab jacking . I wasn’t sure could be done & found this video in particular.you helped old lady get smarter.
I for one am in the same boat. My patio is on a slope and the slab broke half way. No rebard was installed soooo, yeah. Well I been on youtube for like a week straight looking for some diy to fix the problem. Then, this man has blessed my game with what looks to be some really really inexpensive work. So. I'm going to try this, TODAY, lol. My patio slab is much bigger and much heavier bit at this point, I'll try anything. The wife wants it done and I need it done so the kids can go outside and leave me the hell alone. Told em I was gonna start putting their toys under there to jack it up if they dont start acting right lol. Bit any-who, thanks for the video buddy. Have a very blessed day sir! No 🧢👍
@@icyviolator5536Did you try this? If it worked, is it still good 2y later? I also wonder how much the foam continues to expand after you stop spraying.
I luckily ran out of cans of foam when trying to lift a 36 inch by 50 inch sidewalk slab. I put 2 C-clamps on the side facing my front lawn, attached chains to a 6x6 beam and bottle jacked the beam/slab up 1.5 inches to match the the other slabs. I could not grab any other sides as they were hemmed in by the curb/other slabs. The curb side was still down an inch. I drilled 9 holes and started filling the curb side first, I think that was a mistake as the foam had plenty of space to expand towards the lifted side and the curb end did not seem to be lifting. I then started to fill the holes on the lifted end to dam up that end. I used all 6 cans of foam (Great Stuff Wide Gap Exterior) that I had and ran out to the hardware store. When I returned 25 minutes later the whole slab had lifted up a little too much. (evenly) I was lucky I ran out or I would have kept pumping foam in there and I would have raised the slab up way too much. I had to raise one of the adjacent slabs a little bit to even it out, I only drilled 3 holes and did not use the bottle jacks on the adjacent slab. In general I am happy with the project but be careful not to over do the foam as it continued to lift for a half hour or so.
Great idea! DId you notice that the other slab (where vacuum is) was slowly rising too? Guess that's okay as long as it's not too much. Thought about how the pros do it and wondered about this method. Thank you.
This is awesome. Many thanks for this useful video. My only question is where the foam once cured has enough mechanical strength to support the weight of slab? And will it last?
@@hcrankin5923 I raised a small 3’x3’ concrete pad roughly 2”-3” using 8-9 cans. I drilled 4 holes near the corners . Like I said in my previous post, be patient as the foam will continue to expand and raise it higher than planned.
I wouldn't have thought that those cans would have enough pressure to force the foam as far as it needs to go. I'm guessing that's why they drilled multiple holes so close together.
I tried this on a 36' wide walk way. used 4 cans till it was squirting back out of the holes, and I had the holes pressure sealed pretty good while squirting it in. It really didn't do any good, maybe 1/16th " rise. $ down the drain.Now I will try another area.I drilled the holes. Now I'm wondering if the slab might be more likely to lift if I put water down the holes and let it get damp over night. Wondering if that might help to break the tight seal between the concrete and the dirt underneath.
I have raised many slabs with foam and jacking equipment. Was thinking about trying this just never had the time. The foam should hold due to he used the right type. It may come down eventually but that would be due to erosion which cannot be controlled except with other types of erosion control. Comment about cutting loose is a good idea to.
If you manually raise the slab/concrete to just below the flush point then inject the foam that may be enough to let it get under more of the base. If it doesn't level, let it go off then try again. 👍👍 God luck.
10 cans Great Stuff? Basically trying polyjacking but doesn't address the continued sinking of the ground below, so will be sinking again. Probably wasn't built over solid base, sand, packed road base deep enough. Also water flow issues and clay soils in NW Ohio expansion, shrinkage, freezing repeated cycles...needs a base under the concrete that can flex with the freeze- thaw cycles or just expect this repair to be needed at least annually...
I’ve seen a video that shows a cross section of two separate slabs. One slab is lower than the other but they are both sunken in at the center line. There is soils under them but with gaps. The hole is drilled and filled in one slab. When filing, the foam rushes under this slab and also under the adjacent slab and they both rise up. The one that was lower actually equalizes (maybe based on equal weight?) and catches up to the other one. They both end up level and even with each other.
Is that Closed Cell or Open Cell foam? I saw videos with someone using Secure Set foam and its closed cell. I have Froth-Pak foam in stores near me but can't tell if it's open or closed cell high density. I need to do a driveway.
It’s hydro jacking with a thick fluid that eventually cures. The process is just like mud jacking. It’s the thick fluid that raises the slab, not so much the foam expanding. If it was the foam expanding, it would keep lifting for the next few minutes as the foam fully expands. Since the foam expansion doesn’t have the power to move the concrete it pushes down on any weak spots in the soil as well as fills any actual voids.
Another guy had a way to lever up the slab with a 4x4 by digging around it and put pink insulation foam slabs under it. Pounds per square inch seem to be much higher than this small can stuff.
I'm building an 8x8 metal arched metal shed and looking to fill 2 inch space between my paneling and the metal exterior (Yeah I have no intention of ever taking it apart). In all I think I need to fill about Four 4x8 panels x 2 inches ( I think about 800 cubic inches). Possible with cans? How many?
Not sure if this would work for your situation as you may over lifting or break your panels. But if you would like to give it a try, you may want to go slow with 1-2 cans and wait at least 1-2 hours before deciding if you want to add more. I wasn't very patient and over lifted my other panels by 0.5-1 inch in video # FnF302, FnF303. My other panel (I think it is about 4ft x 6ft x 4inch), was lifted by ~1inch with only 2 cans (video # FnF304).
good idea, just be mindful that the foam may be open cell and will absorb moisture and eventually breakdown contaminating the soil. I use a closed cell that will not leach over time. For the 12 cans ($144) used to get a partial lift a professional could achieve entire project for same price. Be sure to fill voids away from joint to support slab and prevent crack in future.
@@yellowbellybee I am estimating walk at 4ft wide and (2 sections) 8ft long with 1/2in lift one end, would charge $100 if i could combine with other work in neighborhood. Take about 15mins. Warranty for 3 years.
Every single "pro" in my area have an $800 minimum. I just needed a void filled on a 2' x 3' slab that didn't sink or crack that water erosion flushed out underneath. Fixed it myself with 5 cans of foam and 3ft of hard vinyl tubing for $46.
@@friendnfamily9053 Great to know. I'd call 2 years a massive success especially considering the low cost of Great Stuff. I have a void that opened along the side of my patio. Going to use your method. Doesn't require any jacking so this is just preventative.
@@trevorsmith4597 Hi, other related videos can also be good reference. Be patient and give it time as the foam can over lift the concrete as in video FnF302: ua-cam.com/video/NkM2KJf_Xcc/v-deo.html
In other vidoes they raise the concrete with jack, creating air pocket under path. Then fill holes with foam, but you do not raise concrete first. Is it possible there will be no where for foam to go and so not work to raise concrete?
It will sink the foam is a .5 pound foam not strong enough to last more than a couple of months. Needs to be a 2.5 lbs to 4 lbs by volume to work permanently
Your slab is sinking still because of your yards drainage likely. Also I bet your one slab was hooking under the farther slab and couldn’t go any higher without wanting to raise the far slab too. Resistance.
Hi Mikey: I used up 10 cans in this experiment. Looking back at the video, I think I could stop at 6-7 cans. The size of the drill bit is 3/16. Hope that helps!
Ok. Got a hammer drill but the longest masonry bit set I could find was 6". Where did you get that masonry bit set? Sorry for bombarding you with questions
FriendnFamily Got a nice SDS hammer drill and a 12” bit which was more than long enough. Unfortunately the foam took the path of least resistance and most of it came out the side. Tonight I figured out a way to use a jack and concrete anchors so I’ll try that and inject the foam to fill in the void. Thanks for the video!
@@HRradness I think a work around might be to fill in the edges first then shoot foam up the middle holes when that has dried? I haven't tried it but seems like it might work
Great video, but this method potentially causes a big repair cost because we don’t have any idea how much the concrete slab will be raised up. What if it’s raised up too much? Then, it’s going to be a bigger issue
Just dig out the edges on both sides. Use a 2x4 and 4x4 to pry up, use bricks to hold it in place. Fill with crush/run gravel to proper level, pack a concrete slab about the height and width of the gravel, let it solidify and then bury it back with dirt, should be good. Idea i had. Wife wants to raise slanted sidewalk lol. Ill try to remember to do a video and post to my channel. This guys video was good. He was testing. His next time will be excellent
In this video, I had the holes drilled ~6 - 7 inches from the other slab. I think it should work better with the holes drilled ~10 -11 inches away from the other slab.
@@Baltimore789 Having the holes too close to the other slab, the foam would have more chance to get under and lift the other slab too. Hope that helps!
It always helps to either saw the joint between the slabs or to ensure that the joint is clean. Any debris or friction between the slabs can reduce or even prevent movement. I've even seen slabs break just because the joint wasn't cleaned.
The guys who make a living slab-jacking are not going to approve of this as it will diminish their work and absurdly high prices. I used this method 4 years ago to for (2) 36" sidewalk slabs. Rain, feeeze, thaw, snow in NE and hasnt moved an inch.
Thank you for sharing! I am in the NE of Ohio, and mine also hasn't moved an inch for over a year. Before this foam concrete lifting project, I paid a concrete leveling company to level this sidewalk, but the slabs started sinking after 6 months.
How many cans and what the product name ?
How many cans?
Great Stuff maximally expanding foam, dont use the door and Windows stuff.
I thought about trying this but wasn’t sure it would have enough force to lift it. Pretty cool. I ended up using chains and bottle jacks to lift the slab and poured concrete underneath.
Net time run a saw between the two slabs to make sure they don't catch on each other, I think it would have worked better.
Thank you for the advice!
I’ve used it where if you can pry up a sunken section to level then, you can spray foam the void, once solidified remove pry wedge…
also same as in video not with the intention of lifting the slab but filling in the void under the slab where the gravel/pebble/sand has washed away over the years. The spray foam will stop further settling sometimes that’s the only option if you can not manual pry the section to level.
I thought about this the other day and didn't know if canned foam would actually lift concrete, but it damn sure does. not sure it will work in my situation but it gives me hope
I had this idea re: great stuff but wasn’t sure if it would work ..thanks for videoing how to do it & that it does indeed work! Need to lift a sunken concrete slab on 1 end in my backyard that some contractor gave me a usurious estimate ( over $1100.) to break up & replace the 1 slab that is otherwise intact & stable .glad I you tube-googled slab jacking . I wasn’t sure could be done & found this video in particular.you helped old lady get smarter.
I for one am in the same boat. My patio is on a slope and the slab broke half way. No rebard was installed soooo, yeah. Well I been on youtube for like a week straight looking for some diy to fix the problem. Then, this man has blessed my game with what looks to be some really really inexpensive work. So. I'm going to try this, TODAY, lol. My patio slab is much bigger and much heavier bit at this point, I'll try anything. The wife wants it done and I need it done so the kids can go outside and leave me the hell alone. Told em I was gonna start putting their toys under there to jack it up if they dont start acting right lol. Bit any-who, thanks for the video buddy. Have a very blessed day sir! No 🧢👍
I'd say that's typical trending toward the cheap end to break it out and replace it, fwiw.
@@icyviolator5536Did you try this? If it worked, is it still good 2y later? I also wonder how much the foam continues to expand after you stop spraying.
I luckily ran out of cans of foam when trying to lift a 36 inch by 50 inch sidewalk slab. I put 2 C-clamps on the side facing my front lawn, attached chains to a 6x6 beam and bottle jacked the beam/slab up 1.5 inches to match the the other slabs. I could not grab any other sides as they were hemmed in by the curb/other slabs. The curb side was still down an inch. I drilled 9 holes and started filling the curb side first, I think that was a mistake as the foam had plenty of space to expand towards the lifted side and the curb end did not seem to be lifting. I then started to fill the holes on the lifted end to dam up that end. I used all 6 cans of foam (Great Stuff Wide Gap Exterior) that I had and ran out to the hardware store. When I returned 25 minutes later the whole slab had lifted up a little too much. (evenly) I was lucky I ran out or I would have kept pumping foam in there and I would have raised the slab up way too much. I had to raise one of the adjacent slabs a little bit to even it out, I only drilled 3 holes and did not use the bottle jacks on the adjacent slab. In general I am happy with the project but be careful not to over do the foam as it continued to lift for a half hour or so.
Hi, thank you for sharing!
The thing is how do you know how much foam to apply?
@@corylechner8303 beats me?
I believe the slabs need to cut to separate them. Otherwise, they are interlocked (as the adjacent block can be seen rising significantly).
Great idea! DId you notice that the other slab (where vacuum is) was slowly rising too? Guess that's okay as long as it's not too much. Thought about how the pros do it and wondered about this method. Thank you.
Great idea. Maybe next time lay down thick poly then drill holes and then do the spray foam. It should help to keep the foam off the concrete
This is awesome. Many thanks for this useful video. My only question is where the foam once cured has enough mechanical strength to support the weight of slab? And will it last?
Thanks a lot!! I will try it soon!
What a great video. Definitely going to try this. Was about to have a contractor put a whole new slab.
Did it work???
@@kasiecastleberry absolutely, I definitely recommend using gloves and plenty of rags. Be patient when filling as it may raise higher than planned.
@@C92Moran Do you have a ratio of cans you used to the amount raised??
@@hcrankin5923 I raised a small 3’x3’ concrete pad roughly 2”-3” using 8-9 cans. I drilled 4 holes near the corners . Like I said in my previous post, be patient as the foam will continue to expand and raise it higher than planned.
How long does it take to raise. I put soo many cans im not getting much results
I wouldn't have thought that those cans would have enough pressure to force the foam as far as it needs to go. I'm guessing that's why they drilled multiple holes so close together.
It works! Mahalo for this idea!
I tried this on a 36' wide walk way. used 4 cans till it was squirting back out of the holes, and I had the holes pressure sealed pretty good while squirting it in. It really didn't do any good, maybe 1/16th " rise.
$ down the drain.Now I will try another area.I drilled the holes. Now I'm wondering if the slab might be more likely to lift if I put water down the holes and let it get damp over night.
Wondering if that might help to break the tight seal between the concrete and the dirt underneath.
after they set up drill again thru foam and add more for final level.
Great video. For better foam expansion, I should do it in summer time, correct?
Thank you!!
Try a little prying slab up and shim as you go then foam.
Seems also that the two concrete slabs could be caught on each other. I wonder if you were to vibrate them that they would level out perfectly.
Maybe non expanding foam level first the fill the void, hold there till cured. Can also inject grout.
I have raised many slabs with foam and jacking equipment. Was thinking about trying this just never had the time. The foam should hold due to he used the right type. It may come down eventually but that would be due to erosion which cannot be controlled except with other types of erosion control. Comment about cutting loose is a good idea to.
Thank you for sharing. You are right. Mine is still holding up nicely.
This is great 👍
If you manually raise the slab/concrete to just below the flush point then inject the foam that may be enough to let it get under more of the base.
If it doesn't level, let it go off then try again.
👍👍 God luck.
10 cans Great Stuff?
Basically trying polyjacking but doesn't address the continued sinking of the ground below, so will be sinking again.
Probably wasn't built over solid base, sand, packed road base deep enough. Also water flow issues and clay soils in NW Ohio expansion, shrinkage, freezing repeated cycles...needs a base under the concrete that can flex with the freeze- thaw cycles or just expect this repair to be needed at least annually...
Can this be done to just raise one side of concrete step that’s sunken sideways? The right side of my walk and steps is dipped to the right only
Nice.
Thanks
Like what this guy is doing
Esse produto já vende aqui no Brasil?
Suggestion: Create a playlist of this series of videos.
Thank you for your suggestion!
Looks like it raised both sections of sidewalk, not just the sunken section.
I’ve seen a video that shows a cross section of two separate slabs. One slab is lower than the other but they are both sunken in at the center line. There is soils under them but with gaps. The hole is drilled and filled in one slab. When filing, the foam rushes under this slab and also under the adjacent slab and they both rise up. The one that was lower actually equalizes (maybe based on equal weight?) and catches up to the other one. They both end up level and even with each other.
Is that Closed Cell or Open Cell foam?
I saw videos with someone using Secure Set foam and its closed cell. I have Froth-Pak foam in stores near me but can't tell if it's open or closed cell high density. I need to do a driveway.
Thanks.
How has this lasted so far? Have you seen any settling?
Need more experiments like this. I think there should be easy for a DIY.
WOW, seen the concrete rising. I just didn't think the foam would have the strength to push those slabs up!!
Did it hold over time??????????????
Still holding up ok.
It’s hydro jacking with a thick fluid that eventually cures. The process is just like mud jacking. It’s the thick fluid that raises the slab, not so much the foam expanding. If it was the foam expanding, it would keep lifting for the next few minutes as the foam fully expands. Since the foam expansion doesn’t have the power to move the concrete it pushes down on any weak spots in the soil as well as fills any actual voids.
Foam supports up to 6000 feet per square foot. That’s enormous amount of upward pressure to easily raise a sidewalk slab.
Will this work for a garage slab sinking?
Here I am stressing about my concrete not being even and all he did was use a foam can from homedepot.
Another guy had a way to lever up the slab with a 4x4 by digging around it and put pink insulation foam slabs under it. Pounds per square inch seem to be much higher than this small can stuff.
How about the Pink foam sheets first, and then fill the voids with spray foam?
nice shoes. White pants too.
What size holes do you drill through the concrete to spray the foam? Thanks!
big enough to fit your tube into
I'm building an 8x8 metal arched metal shed and looking to fill 2 inch space between my paneling and the metal exterior (Yeah I have no intention of ever taking it apart). In all I think I need to fill about Four 4x8 panels x 2 inches ( I think about 800 cubic inches). Possible with cans? How many?
Not sure if this would work for your situation as you may over lifting or break your panels. But if you would like to give it a try, you may want to go slow with 1-2 cans and wait at least 1-2 hours before deciding if you want to add more. I wasn't very patient and over lifted my other panels by 0.5-1 inch in video # FnF302, FnF303. My other panel (I think it is about 4ft x 6ft x 4inch), was lifted by ~1inch with only 2 cans (video # FnF304).
what kind of foam is that?
Tried this and it lifted my slab but a year later the slab dropped back down.
The black can definitely works better than the red, but be careful not to over fill. . Worked like a charm👍
Thanks for this comment, I was wondering about the black can
I tried the black my slab is not lifting i tried 4 black cans and 3 small ones .. some foam started coming from the lawn 🤦🏻♂️
Saludos con que nombre puedo buscar la lata negra en amazon?
Best to jack up then spray.
i think you raised your lawn instead of the slab
What happens if the foam keeps expanding and raises the concrete too high ?
Then you raise the other slab so they are even!
The type of foam you use matters. Some are made to keep expanding, others are meant for cracks or even for around pipes so it stops expanding.
Not deep enough to last. Open cell and closed cell poly are not the same. Same principle but not the same strength.
good idea, just be mindful that the foam may be open cell and will absorb moisture and eventually breakdown contaminating the soil. I use a closed cell that will not leach over time. For the 12 cans ($144) used to get a partial lift a professional could achieve entire project for same price. Be sure to fill voids away from joint to support slab and prevent crack in future.
what size project?
@@yellowbellybee I am estimating walk at 4ft wide and (2 sections) 8ft long with 1/2in lift one end, would charge $100 if i could combine with other work in neighborhood. Take about 15mins. Warranty for 3 years.
@@acculift2391 i got quote for $ 950 to do 6 x 14 foot patio.
All the pros around here have a $1200 minimum last I checked
Every single "pro" in my area have an $800 minimum. I just needed a void filled on a 2' x 3' slab that didn't sink or crack that water erosion flushed out underneath. Fixed it myself with 5 cans of foam and 3ft of hard vinyl tubing for $46.
Curious to see how long this will stay raised? I want to try something similar but have been told that the Great Stuff doesn’t last.
Still holding up just fine.
@@friendnfamily9053 Great to know. I'd call 2 years a massive success especially considering the low cost of Great Stuff. I have a void that opened along the side of my patio. Going to use your method. Doesn't require any jacking so this is just preventative.
@@trevorsmith4597 Hi, other related videos can also be good reference. Be patient and give it time as the foam can over lift the concrete as in video FnF302: ua-cam.com/video/NkM2KJf_Xcc/v-deo.html
2 years for ours with no sinkage.
In other vidoes they raise the concrete with jack, creating air pocket under path. Then fill holes with foam, but you do not raise concrete first. Is it possible there will be no where for foam to go and so not work to raise concrete?
the foam expands in the tight space ,it naturally pushes the slabs upward
I guess it depends. I tried it. The slab may have raised a bit but almost all foam went out the edge into the dirt.
so how is it holding up? and great job man
Thanks. It is holding up just fine.
It will sink the foam is a .5 pound foam not strong enough to last more than a couple of months. Needs to be a 2.5 lbs to 4 lbs by volume to work permanently
Cool. I’ve been thinking of trying.psi
It's been a couple years since this video came out can you tell me if that sidewalk is the same or has it settled any?
Hi, thank you for following up. It's still holding up with no sign of settling.
better off and more accurate to use the c-clamp, 4x4 and car jack method
I see you posted this video 1 year ago. Just wondering how well it held up.
Hi, thanks for following up. It is still holding up just fine as shown in this video: ua-cam.com/video/-xge4d5NCZw/v-deo.html
Locktite brand may work better as it is "closed cell" as opposed to open cell. Closed cell will not absorb water.
@@friendnfamily9053 what product did you use and how long the drill bit was and thick ? Please advise
April 2024… any updates on the slab level? Ty
Still holding up
It may not be level at end of vid but what about later?? The foam may keep expanding for some time..
It only expands for an hour max, usually less than that.
@@danielyutzy5321 Good to know, thanks.
I thought that type of foam does not dry/cure in a non air environment?
It needs water to cure
Story has it this slab is now 6 inches higher than the other one
The last I heard it was higher that the gutters and still climbing.
What size drill bit did you use ?
3/16
Can you pls tell me where to buy this can?
Home Depot, Lowes, Menards, Most all Home repair stores. Walmart has something similar its a few different brands of spray foam
Your slab is sinking still because of your yards drainage likely. Also I bet your one slab was hooking under the farther slab and couldn’t go any higher without wanting to raise the far slab too. Resistance.
How’d it hold up after a year?
Hi, thank you for following up. It's still holding up very well after a year.
Where to buy those cans
Any building supply, Lowes, etc.
I have a broken slab that’s sunken in a few places. I’m going to try this. How many cans did you wind up using? And what size drill bit?
Hi Mikey: I used up 10 cans in this experiment. Looking back at the video, I think I could stop at 6-7 cans. The size of the drill bit is 3/16. Hope that helps!
Ok. Got a hammer drill but the longest masonry bit set I could find was 6". Where did you get that masonry bit set? Sorry for bombarding you with questions
@@HRradness Sorry Mikey, but masonry bit set was also 6" long. I think my concrete slab is around 5" thick.
FriendnFamily Got a nice SDS hammer drill and a 12” bit which was more than long enough. Unfortunately the foam took the path of least resistance and most of it came out the side. Tonight I figured out a way to use a jack and concrete anchors so I’ll try that and inject the foam to fill in the void. Thanks for the video!
@@HRradness I think a work around might be to fill in the edges first then shoot foam up the middle holes when that has dried? I haven't tried it but seems like it might work
Wait a second, why does it look like the grass is rising at around 3:13?
the video is in reverse for the replay
Great video, but this method potentially causes a big repair cost because we don’t have any idea how much the concrete slab will be raised up. What if it’s raised up too much? Then, it’s going to be a bigger issue
I have the same question.
Just dig out the edges on both sides. Use a 2x4 and 4x4 to pry up, use bricks to hold it in place. Fill with crush/run gravel to proper level, pack a concrete slab about the height and width of the gravel, let it solidify and then bury it back with dirt, should be good. Idea i had. Wife wants to raise slanted sidewalk lol. Ill try to remember to do a video and post to my channel. This guys video was good. He was testing. His next time will be excellent
Can you link this foam? What is it called?
Great neck gap and crack.
Things still gonna sink with time. But hey I guess for a video
What size drill bit?
It's 3/16.
@@friendnfamily9053 awsome, thanks!
Nice. Whodathunkit? I believe that I will try this in front of my garage where it has developed a lip near the center of the entry..Thanks!
In this video, I had the holes drilled ~6 - 7 inches from the other slab. I think it should work better with the holes drilled ~10 -11 inches away from the other slab.
@@friendnfamily9053 Food for thought. Why do you think that, if you don't mind me asking?
@@Baltimore789 Having the holes too close to the other slab, the foam would have more chance to get under and lift the other slab too. Hope that helps!
FriendnFamily - I agree. Dig further away from the other slab. Super video.
This is the most temporary solution I’ve seen
Polylevel Foam jacking is actually permanent and better then mud jacking.
Several bags of concrete is cheaper than all that spray foam and it would be perfect...
It raised the other side too. Park a lawnmower on the side you want to stay down.
If you Jack up the slab first, then spray the foam in, it works better.
Thanks!
Why not jack it up to level then add the foam .....
If an everyone at had a way to “jack it up” better option would be filler then compact but this is for at home diy
3:52
What a waste of foam.
The forces generated by the cans are not large enough to lift the slab. The guy did not measure it afterwards.
Yet, the slab lifted.
It did not raise the concrete, the right side was closer to level than the left side
12 cans of spray foam $12.50 ea.= $150.00 Couple bags of Concrete and Water $20.00
and several days of digging,, not to mention having to setup a jack. I like the authors method as it is more intelligent.
It is cheaper and nice by replacing the whole thing
instead of drilling holes in your side walk and putting cans of harmful chemicals into the soil, just lift them up and put gravel under it...
Would you need put concrete or just gravel to fill the void
For those of us with moles, your argument holds little water.
The answer to this question is no, no they cannot.
what is it called