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Concrete Countertops: How reinforcing works 

The Concrete Countertop Institute
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Learn from Jeffrey Girard, President of The Concrete Countertop Institute, the principles behind how properly reinforced concrete countertops can enable you to have confidence and avoid problems. Jeff explains how concrete countertops behave like beams, not slabs on grade, where to place the reinforcing and why (including cantilevers) and what materials are most reliable for reinforcing precast concrete countertops. He also touches on how GFRC reinforcing works, as well as gives amazing examples of what a properly reinforced precast concrete countertop can do. View this video if you are a concrete countertop professional who wants to make high performance concrete countertops.
For more about how reinforcing works in concrete countertops, see these helpful articles:
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7 сен 2024

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Комментарии : 272   
@katalytically
@katalytically 4 месяца назад
Excellent explanation for those with little to no experience designing concrete structures. You kept it simple and very understandable.
@therealeeeo
@therealeeeo 13 лет назад
This is a phenomenal video. I'm a contractor but have had no experience with concrete countertops up until now. I'm remodeling my own kitchen, and have decided it would be a good time to use myself as a guinea pig for my first attempt at making concrete countertops. Thank you!
@mattprocter6115
@mattprocter6115 3 года назад
Wow. Your ability to explain this in discharge logical and straightforward terms was amazing. If only every educational video on RU-vid was this clear. I would be a genius.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 3 года назад
I'm glad you liked the video Matt!
@BR0KEdownUNDER
@BR0KEdownUNDER 5 лет назад
Well this certainly explains why my first attempt was a failure. Ont to number 2!
@clicgear100
@clicgear100 7 лет назад
People like you is why RU-vid is great! Thank you.
@jeromefridmann6108
@jeromefridmann6108 2 года назад
Thank U Professor....Really enjoyed this session...Thx. again from an old ME.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 2 года назад
You are very welcome Jerome. Thank you for the kind words!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 11 лет назад
The backdrop was simply a piece of gray cloth, and I used two 4-foot shop fluorescent light fixtures with daylight bulbs on 6-foot stands. Pretty simple!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 12 лет назад
I have always advocated using 9 gauge masonry wire for reinforcing. It's a true, structural reinforcing material, it has great properties, it is easy to work with and it can provide outstanding results when used correctly.
@OeaInc
@OeaInc 13 лет назад
Fantastic video! This was a really well thought out and presented explanation of reinforced concrete design. I have taken many concrete design courses and this is by far the quickest and most intuitive approach I have seen detailing tensile and compressive strength function and placement of reinforcing. Everyone needs to watch a good 10 mins of something like this, not just for concrete, but for the nature of materials and stresses for building. Thanks!
@LordoftheCats
@LordoftheCats Год назад
I am so glad I watched this before beginning my countertop build. THANKS!
@TheConcreteCountertopInstitute
Be sure to read this too! concretecountertopinstitute.com/free-guide-diy-concrete-countertops/
@sticks1215
@sticks1215 12 лет назад
Very well explained. I am going to be building these in my house and needed to address these issues. Thanks for posting this.
@lelandcreecy1178
@lelandcreecy1178 7 лет назад
Great video, very useful information. Thanks Jeffery!
@TheConcreteCountertopInstitute
You are very welcome!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 13 лет назад
I'm sorry to hear about any cracking countertops! Exactly what I'm trying to prevent.
@derekdavis2058
@derekdavis2058 3 года назад
old video...still VERY relevant information and well communicated as well. Great job.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 3 года назад
Thanks Derek!
@GNO89
@GNO89 13 лет назад
Excellent video on the explaination of forces to a countertop.
@HereComeThePunks
@HereComeThePunks 5 лет назад
great video - i suggest to others watching to set the speed to x1.5
@DrAlexVasquezICHNFM
@DrAlexVasquezICHNFM 3 года назад
Perfect explanation
@brendanbyrne3028
@brendanbyrne3028 7 лет назад
Wow, I just realized how little I actually knew by watching this video, very informative.
@KBTG
@KBTG 9 лет назад
Wonderful. Clear and to the point. Easy to understand teaching that applies to a wide range of applications. Keep it up.
@TheConcreteCountertopInstitute
+kbaxter777 Thanks for the compliment! Please note that there are several other free training presentations available at www.concretecountertopinstitute.com/class-schedule/#Webinars.
@duplessis2006
@duplessis2006 14 лет назад
fantastic now i am feeling more confident about doing my own countertops
@FortniteWins66
@FortniteWins66 13 лет назад
The part about reo placement was well explained. I wish my civil engineering professors explained it as well as this!
@nicopostigo123
@nicopostigo123 3 года назад
Great information 👍
@spacemonkey0077
@spacemonkey0077 8 лет назад
Thanks Bro! This video was really informative. I appreciate that you took the time to do it!
@TheConcreteCountertopInstitute
You are very welcome!
@davyrockxx1563
@davyrockxx1563 7 лет назад
this informed my left ear very well!!!
@mikekearsley2407
@mikekearsley2407 6 лет назад
Very good video, Thanks. Like your pictures. I am making precast concrete stair treads for an outside deck. Your video has helped a lot.
@stephendumaine1575
@stephendumaine1575 9 лет назад
great help! this vid answered many Q's i had about reinforcement. now i can embark on my 1st DIY project! thank you!
@TheConcreteCountertopInstitute
That's great Stephen! Keep in mind, I do also have the Level 1 Getting Started Self-Study program. Check that out here: www.concretecountertopinstitute.com/modules/info/self-study_training.html#GetStarted. There is also a free 3-hour seminar here: concretecounter.infusionsoft.com/app/page/diy-concrete-countertops-free-training.
@OwenVentures
@OwenVentures 12 лет назад
What a GREAT video!!! I'm a "why" person, so.. I don't like hearing "don't do this" or "do it this way", but... WHY to do, or not to do something. Thanks sooo much!! The last picture of the 500# on the plank.... VERY impressive! I'm SOLD! :D
@mattka5354
@mattka5354 6 лет назад
Absolutely brilliant. Thank you for posting. This will help me with my concrete countertop for my outdoor kitchen.
@TheConcreteCountertopInstitute
You are very welcome Matt. Thank you for the kind words.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 11 лет назад
Thanks Neil! Please contact us via the website to address your question. This will require some engineering, but overall your thoughts sound on track.
@GoNutsButch
@GoNutsButch 2 года назад
Thanks Jeff for sharing your knowledge, much appreciated
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 2 года назад
You are very welcome!
@justjast
@justjast 12 лет назад
WOW! I learned so much from this video!! Loved the scientific explanations--now it all makes sense. Thanks so much for making this video!! Jody
@bradleykindell4666
@bradleykindell4666 6 лет назад
in conclusion, with concrete particularly, we have so much flexibility and it will tolerate lots of flex, especially when you try to realise your designs. however, there are some basic building block engineering tenets that this man puts back in your mind. concrete is seriously underexploited, but then so are most plant fibres too.
@902Jr
@902Jr 12 лет назад
Very interesting, and sound engineering principles applicable anywhere and everywhere.
@pongstornpromlake45
@pongstornpromlake45 7 лет назад
Great details for concret maker and they have to know this priciple
@jcims
@jcims 12 лет назад
Very educational video! It's one thing to say what to do, but this says why. Thanks for putting this together.
@sancop
@sancop 2 года назад
Thank you!!!!! Excellent information!!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 2 года назад
You are very welcome Sandra!
@ilgesmccool
@ilgesmccool 14 лет назад
Really wonderful video. Easy to understand and apply. Great pictures to go along with your wording. So happy I found this.
@gracevalriofarms2204
@gracevalriofarms2204 8 лет назад
I've been searching for information that would help me make a better product. Thank you so much for sharing your expertise with anyone who finds your channel. Thanks again!!
@TheConcreteCountertopInstitute
+Grace ValRioFarms You are very welcome!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 13 лет назад
Thanks everybody, I'm glad this video is helpful. courduroycarver, AR glass mesh is also called "scrim". Fishstone Concrete Countertop Supply and Ball Consulting sell it. Fishstone sells it in small quantities.
@CoCoSWISS1
@CoCoSWISS1 8 лет назад
Wow, well done; teaching not just what and how but why - Kudos! Excellent work, can't wait to check out your other videos, info, etc.
@TheConcreteCountertopInstitute
+Eric Smith Thanks! I'm glad you liked it. Be sure to check out all my free seminars here: www.concretecountertopinstitute.com/free-concrete-countertop-training/
@calebwinter2579
@calebwinter2579 7 лет назад
Thanks for the great video Jeffery! Very helpful. I am making 1.5" thick pre-cast countertops for our kitchen and am planning on using 9 gauge masonry wire as reinforcement. Based on the info presented in your video, am I correct in saying that you would not suggest making a perimeter loop out of rebar or any other material? Also, what distance from the edge of the countertop would you recommend the reinforcement ending? I have heard that air trapping can occur if the reinforcement is placed too close to the edge. I read your article on ghosting and in your words, "A third way ghosting occurs is when reinforcing already buried in fresh concrete is moved or vibrated". I was planning on using a vibrator to help the concrete settle in the mold..would you recommend not using a vibrator at all? Please let me know what you think! Caleb
@hermanpick8821
@hermanpick8821 8 лет назад
Brilliant and concise presentation! Thanks a lot.
@TheConcreteCountertopInstitute
+Herman Pick You are very welcome!
@tylerhodge1568
@tylerhodge1568 5 лет назад
I learned a lot thank you very much.
@TheConcreteCountertopInstitute
You are very welcome Tyler!
@GateKommand
@GateKommand 6 лет назад
Jeffrey Girard what a great informative video mate, thank you!
@TheConcreteCountertopInstitute
You are very welcome!
@jamesskelton3488
@jamesskelton3488 6 лет назад
My right ear is lonely. Give it some sound
@mmedeiros09
@mmedeiros09 14 лет назад
Great video - you have a solid knowledge base of reinforced concrete.
@carllacson8023
@carllacson8023 7 лет назад
This is WISDOM. Thank you. Sharing is Caring. :-)
@TheConcreteCountertopInstitute
Thank you for the kind words, Carl.
@niamatullahshinwari4841
@niamatullahshinwari4841 8 лет назад
Thank you sir, explained very well... I appreciate your devotion....
@TheConcreteCountertopInstitute
You are very welcome!
@pkqkennywood
@pkqkennywood 13 лет назад
finally a video that actually explains something. can i use thinset with fiberglass cloth? is it a necessity to have a thickness of 1.5 to 2 inch thickness?
@Dendro2001
@Dendro2001 12 лет назад
Well done and thanks for taking the time to help us DIY'ers!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 13 лет назад
Planetary polishers are a fantastic tool that makes producing smooth, flat and gouge-free surfaces fast and easy. Justifying their cost (and the tooling - in triplicate!) is something you need to determine. Do you do a lot of large, flat countertops? Do you or your employees struggle with keeping a single headed polisher flat? If so then maybe a planetary polisher is a valuable asset. You will still need a single-headed polisher for narrow sections, edges and inside integral sinks.
@neilbergman9245
@neilbergman9245 11 лет назад
Thanks for the great video. I am making a media center out of 1 1/4" black iron pipe and concrete. The two concrete shelves will span about 7 feet (x18" wide), and are supported on either end by the steel pipe skeleton. There may be up to 300 pounds of LPs on one of the shelves, dispersed evenly across the 7 feet. Can you recommend a slab thickness and rebar thickness? I was thinking of 2 1/4" slab, with 1/4" rebar running lengthwise every 6", leaving 1/4" from bottom of rebar to finished bottom
@aidenraiden4258
@aidenraiden4258 7 лет назад
I liked the pictures you used, it was funny and explanitory.
@TheConcreteCountertopInstitute
Thanks Aiden. I'm glad you liked it.
@danwerkman
@danwerkman 2 года назад
Thanks for this video...
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 2 года назад
You are very welcome!
@antoniofuentes9202
@antoniofuentes9202 10 лет назад
What concrete is "good enough" foe a DIY countertop?, provided the reinforcement is done correctly and thank you for all the information given.
@TheConcreteCountertopInstitute
Antonio Fuentes Hello! I apologize for the extremely long delay in replying to your comment on the concrete countertop reinforcement video. RU-vid was not sending notifications of video comments. If you still have questions, please contact our office at info@concretecountertopinstitute.com for assistance in a timely manner. Thanks!
@Teach2Build
@Teach2Build 7 лет назад
Whoa. I just learned a lot. Thanks for the great video!
@TheConcreteCountertopInstitute
You are very welcome!
@aliVimtaj
@aliVimtaj 6 лет назад
great video, thanks for sharing!
@subinchannel1
@subinchannel1 11 лет назад
VERY VERY HELPFUL VIDEO THNX A MILLION FOR THIS....GREAT JOB.....EXPECTING MORE VIDEOS......
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 12 лет назад
You're very welcome!
@GlynWilliams1950
@GlynWilliams1950 6 лет назад
Very Informative. Thank you
@andreaslianos326
@andreaslianos326 8 лет назад
great and very accurate explanation!!!
@TheConcreteCountertopInstitute
Thanks Andreas!
@patrickeh696
@patrickeh696 7 лет назад
Nice vid! You should also add basalt to your reinforcing fix.
@mramadabla
@mramadabla 12 лет назад
Very informative! Thanks for making this video.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 12 лет назад
With careful placement and casting it's possible to place reinforcing as close as 1/4" from the visible surface. Note that this will not cause ghosting. Ghosting is caused by *pushing* the reinforcing through the concrete, no matter where its placement. Your question regarding the cantilevered bartop requires design services beyond the scope of these comments. Jeff Girard does offer consulting services. Contact us for details.
@H2oways
@H2oways 6 лет назад
With all of the terrible videos done by people who know nothing, its nice to find a video with a guy who knows what he is talking about. Great video.
@TheConcreteCountertopInstitute
Thank you @H2oways!
@qsbux
@qsbux 12 лет назад
Easy to understand it :) Thank you
@groovehog1
@groovehog1 9 лет назад
Great video! Thank you for the valuable info!
@TheConcreteCountertopInstitute
***** You are very welcome!
@JasonDeats
@JasonDeats 6 лет назад
Thank you for this great video.
@TheConcreteCountertopInstitute
You are very welcome Jason! I'm glad you liked it.
@malfunction6993
@malfunction6993 7 лет назад
Brilliant. Thanks.
@michaelraduazzo6146
@michaelraduazzo6146 7 лет назад
A very informative video! I'm planning a counter top (60" X 30" X 2" slab) with a 2 inch over hang on 3 sides. Should I run the ladder wire from back to front (30") or lengthwise (60")? Thanks again for the great video!
@TheConcreteCountertopInstitute
Thanks, I'm glad it was helpful! this is a good question. You are thinking about where the stresses are in the countertop. You should definitely run the reinforcing lengthwise (60"). To be safe, it wouldn't hurt also to run it back to front (30").
@danrowe79
@danrowe79 7 лет назад
Great info, great video Thank You.
@TheConcreteCountertopInstitute
You are very welcome.
@pliantgraymattersociety7233
@pliantgraymattersociety7233 2 года назад
The tensile modulus of steel matches concrete while glass does not….please elaborate on this point. It seems to me that cracks will form sooner as the glass is not properly supportive within the modules of concrete .
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 2 года назад
I assume that you are talking about the AR glass fibers used to reinforce GFRC. GFRC has a radically different mix design than ordinary concrete, and is more in tune with the flexibility of glass reinforcing. I have extensive articles and videos about GFRC here: concretecountertopinstitute.com/free-training-category/how-gfrc-works/ Tensile modulus is an indication of the stiffness of a material, in other words how stretchy or not something is. A high number means the material is stiff, and a low number means the material is stretchy. Steel has a higher modulus than glass, i.e. it is more stiff and less stretchy. Therefore, with all else being equal, a strand of steel that's the same diameter as a strand of glass will stretch less than that strand of glass under the same load. With conventional concrete (rocks, sand, cement, and water), the concrete's overall ability to stretch without cracking is extremely limited. Conventional concrete is brittle, which means that it doesn't take much flexing to cause a crack. The structural reinforcing material must take up all of the tensile forces and at the same time prevent the reinforcing from stretching so much under load that the surrounding concrete cracks. Because steel stretches much less than glass, it takes a relatively small amount of steel to resist the tension-induced stretching. You can't use glass fibers and glass mesh (aka scrim) in conventional concrete because there's simply far too little that can be mixed into the concrete to provide the degree of tensile capacity AND stretch resistance that ordinary concrete requires to resist cracking. Fiberglass rebar exists and can be used in conventional concrete, but the amount of fiberglass rebar that must be used to resist the amount of stretching that is necessary to prevent cracks in the concrete is much greater than the amount of steel that is required. So steel is the preferred method of structural reinforcing for conventional concrete.
@samueltan3845
@samueltan3845 9 лет назад
I think, you doing good job explaining for "engineers", not for "workers" who can't imagine. I agree almost everything except metal re-bar. (Portland) Cement is Alkaline, it will encourage corrosion on metal. That is why bridges collapse. Even Glass Fiber on Polymer Cement has to be Alkaline Resistant. Your statement saying high volume structural fiber is relative, since their total cost is less than (material and labor) of re-bar and lasted much longer. Spread thin entire (bottom) surface and adhered to cement., its strength to be compared with surface gluing to spot welding. While cement never really adhere to metal, that is why re-bar has ridges for better grips. It diminished after start corroded, swell and split the surface of concrete exposing to humidity. Dipl.-Ing ST
@ubuntuscorpious
@ubuntuscorpious 7 лет назад
Excellent Video. Thanks very much! In your example of a sink cut into the bench top, how would you have reinforced this? Cheers.
@TheConcreteCountertopInstitute
You are very welcome Tom! When you have a sink cutout, you still need to run the reinforcing all the way along the slab in a continuous straight line. So you reinforce the same but also add extra reinforcing in front of and behind the sink.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 12 лет назад
You're welcome!
@bricewiltgen687
@bricewiltgen687 7 лет назад
What is the best way to avoid the ghosting? You mention in your blog that pouring over reinforcement and placing reinforcement after pouring both can cause ghosting...as well as vibration...so what is your best recommendation on how to avoid this? Finally if it is pouring over the reinforcement, how do you suspend the ladder wire? Thanks Jeffrey!
@TheConcreteCountertopInstitute
Please see this article about ghosting: www.concretecountertopinstitute.com/blog/2012/10/how-to-avoid-ghostlymistakes-in-your-concrete-countertops/
@sinnomor
@sinnomor 12 лет назад
How close may the reinforcing be to the surface of the concrete?And what type of concrete would you reccomend for the following project?I am building a 14'x21(w)x2"(t) 16" of the width to be canted. 3" bearing using #3 on 16"centers for support and #9 ladder wire tied for tensile strength A 2x6 wall provides the 3" of bearing The rebar will be L shaped with legs of 8 and 20 inches,the 8" leg will be inserted into a3/8 hole in the 2x6 studs and glued the 20 "will support the slab Thanks
@BuddhaScribe
@BuddhaScribe 7 лет назад
Great information. Thanks.
@TheConcreteCountertopInstitute
You are very welcome.
@jaredthompson5056
@jaredthompson5056 4 года назад
Thanks for the numerous videos you guys have posted. They have been of great help. Im about to pour a 9ft x 3ft x 1.70'' thick countertop which I will then have to carry into place. Im wondering on the thickness of metal reinforcement I should use? Would 1/4" or 7mm be ok? Thank you.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 4 года назад
Hi Jared. You're welcome! That should be okay. For a 1.5" thick countertop we typically recommend 3/16" reinforcement. Yours is a little thicker. There are more articles about reinforcement on our website: concretecountertopinstitute.com/free-training-category/reinforcement/, and we have a self-study course about it as well: concretecountertopinstitute.com/shop/reinforcing-101/
@richardsharpe6230
@richardsharpe6230 8 лет назад
Thanks pretty good video . I would like a little more info on how ya do the installation. I'm a new contractor investing my time into this business venture. I've been in stamping concrete for pools and driveways since before it became big and people started doing it. I'm now on my own and disabled and want to try doing countertops for my house and a couple of friends of mine. So i'm no rookie by no means to stamp crete lol.
@TheConcreteCountertopInstitute
Hi Richard, sorry I missed this. Please see this article about installation: www.concretecountertopinstitute.com/blog/2014/02/installation-important-countertops/ Countertops/sinks/fireplaces/etc. are a great way to be creative with concrete without the backbreaking labor involved in flatwork and in the comfort of your own shop. Best of luck with your venture, and I hope that CCI can be a part of helping you succeed. Please don't hesitate to contact us at info@concretecountertopinstitute.com.
@narco73
@narco73 6 лет назад
Great vid (other than the audio only on one side. Did you know that you can re-upload a new audio track to the same video, and this way you could fix it?)
@TheConcreteCountertopInstitute
Sorry about that, and thanks for the tip!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 13 лет назад
Wooden tops on the cabinets will not provide structural support. Wood is too flexible and weak, so you still need the proper steel reinforcing in the concrete. The dimensions of the cabinets are fine - the concrete countertop will lay over top of several cabinet boxes, depending on the layout of your kitchen.
@TheRobertralph
@TheRobertralph 8 лет назад
very helpful!!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 11 лет назад
Ladder wire should never be welded since it is cold-drawn to achieve its high tensile strength. Welding anneals the steel and lowers its strength. Ties are only necessary for convenience; they offer no structural benefits. I find 4" nylon cable "zip" ties to be very effective. 3/8" rebar may be used in 2" thick concrete with care to keep it very low in the slab. 1/4" rebar would be better.
@theauntiechrist
@theauntiechrist 8 лет назад
that was brilliant. thanks
@TheConcreteCountertopInstitute
You are very welcome! I'm glad you liked it.
@smkenn06
@smkenn06 9 лет назад
Jeff, you said in this video that reinforcement that runs across the narrow width of the countertop is poor practice. I would expect that once in-service the 2' direction of the countertop is the span that see flexural load. Therefore, I would think that reinforcing is important in both directions: lengthwise is important for transport loads, while reinforcing across the narrow width is important for in-service loads. Do you Agree?
@TheConcreteCountertopInstitute
Shawn, you are correct. The need for reinforcing is greatest when you are lifting and moving slabs in your shop and during installation. Once installed, the width of the cabinet is the greatest span that the countertop will experience. Many cabinets are 30" or 36" wide and 24" deep. Additionally, the front edge of a cabinet is "soft", meaning the front opening isn't rigid like the side walls because of door and drawer openings, and because the front of the cabinet doesn't extend all the way down to the floor like the side walls do. So yes, you should reinforce in both directions, although the short direction is less critical. While I don't mention this in the video in order to simplify the concepts, reinforcing in both directions is included in the step by step instructions in my textbooks. Very good question, thank you!
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 13 лет назад
Thanks Oealnc for the nice comments. Pkqkennywood, the answer to your question is essentially no. I've just posted a blog entry. Go to the home page of my website and click Blog at the top right. Karenwaln, I will get to your question soon. It takes more than 500 characters to explain! Basically, I used 14 individual strands of 9 gauge ladder wire. The strands were placed about 1/4" apart in order to fit all 14 in a single layer within the beam's 6" width.
@tripp333
@tripp333 10 лет назад
Fiber glass mesh vs wire mesh vs fiber Which is the best and why. I understand fiber glass is the easiest which will give you the best strength? Should you use 3/4" plywood as a backer? What is the best way to strengthen the thin strip in front and behind the sink people are always sitting there..
@lovebug11768
@lovebug11768 13 лет назад
Great info. Do you need to put in reinforcements if your cabinets already have a wooden tops which the counter will lay on. My cabinets have odd dimensions too (I have one of those weird, modern kitchens). Some cabinets are 12" X 40", 12"X14", 24"X30". Should I bother putting reinforcements in these or are they too small?
@MrAzizcan
@MrAzizcan 12 лет назад
what is the process of making concrete ? Can you explain that with your primary sources please ?
@boaire
@boaire 11 лет назад
What would you recommend for someone who is obsessed with learning this stuff, but has no experience in concrete, or construction, nor has the money to spend on a seminar or workshop, but wants to do this as a profession?
@henxan
@henxan 12 лет назад
Wow! This was a very educational and interesting video! :)
@blackduck8891
@blackduck8891 13 лет назад
What if any reinforcement do you suggest with a fireplace hearth. dimensions are 24"x36" with 45 degree corners Thank you
@wheelsup
@wheelsup 11 лет назад
So long story short use masonry remesh wire, 9 gauge? Run it longitudinal and latitudinal, how do you tie it in together? Weld? If you make a 2" slab can you use regular 3/8" rebar? Or still too thick?
@Holdfast
@Holdfast 3 года назад
Hello - would 1/4"-20 fully threaded zinc plated steel rod be too thick or unsuitable for a 1.5" thick concrete countertop? My sink cutout leaves the counter only about 3" to 4" wide infront and behind the sink. My first attempt cracked but had no reinforcement! Thanks for explaining tensile strength.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 3 года назад
That size is fine, it's not too big. While steel threaded rod generally does have good strength, often small diameter common grades are made from steel that has a tensile strength lower than block masonry ladder wire. The simple solution is to use two pieces instead of one to ensure plenty of strength.
@TheConcreteCountertopInstitute
@TheConcreteCountertopInstitute 13 лет назад
A piece that small won't need reinforcing, provided it's at least 1" thick. Set the piece just like a tile with a full bed of thinset mortar.
@soulevs
@soulevs 12 лет назад
awesome video man, two thumbs up!!
@williamday7026
@williamday7026 7 лет назад
I'm doing an outdoor concrete countertop and I was wondering if I could or should use the block wire and the fiber glass together ,it will be two inches thick and i will be using 3/4 inch stone in the mix as well ,thanks for you help
@TheConcreteCountertopInstitute
If by fiber glass you mean AR glass fibers, no. Those are used as primary reinforcing in Glass Fiber Reinforced Concrete, whereas steel is used as primary reinforcing in traditional aggregate based concrete. You can use various types of fibers for secondary reinforcement to control plastic shrinkage cracking, but those fibers will not replace steel or provide/supplement structural reinforcing. Please see my blog articles about fibers: www.concretecountertopinstitute.com/blog/?s=fibers&submit=Search Curing is also a very important part of crack prevention, as is proper mix design and low water-cement ratio.
@shoes121255
@shoes121255 7 лет назад
how does basalt fiber reinforcement compare to gfrc? also what about a carbon or fiberglass mesh instead of ladder wire?
@corduroycarver
@corduroycarver 13 лет назад
You mention AR glass mesh. I have searched online for this and I've been unable to find it except in very large quantities from overseas. Is there a special store that usually carries alkali resistant glass or should I start snooping around my local concrete countertop shop?
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