To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Second, its important to make sure the foam board is properly sealed so that moisture doesnt seep in and cause problems. Third, foam board can be cut to fit any size tub, so youll need to measure your tub before purchasing the material. Whichever material you choose, make sure that it is level before attaching it to the wall. Drop By My House is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. However, too much flex and you risk damage to the bathtub. Why Does Your Bathtub Need Expanding Foam? To use it, mix the cement according to the package directions and then apply it to the void with a trowel. Any idea why there's a void (visible through the tub access panel down to the dirt) under the bathtub while the rest of the house is concrete slab? Home House & Components Rooms Bathroom Bathtub. yup that would show my humble position of novice : ) The joist I see is the supporting joist that goes under the center of my bathroom all the way to the wall. If youre like most people, you probably assume that the concrete slab beneath your bathtub is there to provide a sturdy foundation. It performs best. That might include natural stones or a manufactured product. These spray foams are extremely easy to use. (Fixed), Bullnose Vs Waterfall Carpet On Stairs (Compared), Bosch Dishwasher Dishes Taste Like Soap! Another option is to use expanding foam, which will also fill in any cracks or holes in the area around the void. Its nothing but a piece of cake if you know the proper steps on filling the void under the bathtub. Otherwise, a small hole in facing drywall can do the trick and will require little patching to repair afterward. If your home has a fiberglass tub, you may eventually need to patch or repair it. Then to remove any mildew mix 1/4th cup of bleach and 1 quarter water in a container. Whichever method you choose, make sure to follow the instructions carefully and allow plenty of time for the material to dry before using the tub again. You are using an out of date browser. This is why its better to fill the tub to add some weight. Hook Plastic Tubing To End Of Spray Foam Can. This is a type of cement that is designed to set quickly underwater. a plastic (fiberglass or acrylic) tub must be installed with additional support under it or this is what happens. You're right that it needs to be supported somehow, though. Hi, Im Brad! Be sure to wear gloves and protective clothing when working with this product as it can be messy! If you dont have ridge foams, you can put a drop cloth or plastic film. Do You Have to Use Mortar under a Bathtub? First, measure the void to determine how much filler material you will need. Oct 25, 2011. How to use expanding foam under the bathtub? Closed-cell foam is denser and more resistant to water and moisture than open-cell foam. This guide will explain how to fill a void under the bathtub and what mistakes to avoid during the process. Well, expanding foam can be the best solution to your problem. Oops somebody "helpfully" changed my title. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Fill the rest in such a way that it would travel horizontally while it expands. But if you want to use wood then its best to use Styrofoam wood trim. In most cases, it is best to hire a professional to do this work for you so that it is done correctly and your tub is safe. Weve already mentioned the dangers of using too much spray foam. Scrub the joints using this mixture with a toothbrush. Adding support (whether expanding spray foam or something else) isn't going to repair the crack and make it hold water. How Long Does It Take to Grout 400 Sq Ft Area? That creates a smooth transition from the surface of the deck right into the tub. The foam is removable if you need to access around the tub, but removing the foam is not exactly an easy task. Spray foam, made from polyurethane, is often used to fill in gaps. My concern long-term would be the durability. After several hours, you can take out the extra foams that are accumulated around the base! Be sure to wear gloves and protective clothing when working with this product as it can be messy! as in example? Simply just fill up the whole bathtub with water to expand. This website uses cookies to improve your experience. Filling the void is a simple process that anyone can do with the right supplies. How can I fix floor cracks in bathtub (enamel?) From me and this website, you can expect some useful tips on great ideas for a modern bathroom. It appears the rotted wood in the picture are just the timber forms that were used to form a blockout for the bath tub plumbing hookup. This process helps the bathtub to expand to its full width and length. What's the difference between a power rail and a signal line? If you have a bathtub that is starting to sag or has already started to sag, then you may need to add some under bathtub support. You get into your bathtub and it feels like it is moving underneath you! I sprayed a third and fourth can for "small spaces" which also had a faster cure time and smaller expansion. Its more difficult to install an undermount tub than a drop-in. Some people use drywall board instead of Styrofoam because of its easy access. However, extra problems can occur due to improper application. Would a different product work better for this? Bathtubs are not level or flat so they cant directly touch the floor. This is where the expanding foam is going to do its job. Anyway the water there is a problem. If you fill the whole area up at one go, it will lead to bulging. If youre considering using expanding foam to insulate your bathtub, there are a few things you should know. The best practice is to spray a light bead of low-expansion foam in the gap around the window. To use it, mix the cement according to the package directions and then apply it to the void with a trowel. You can use either plywood or 2x4s. What do you put under a fiberglass bathtub? If you make a mistake or need to remove the tub down the road, it will be almost impossible to remove the mortar without damaging the tub and the surrounding areas. Mortar is also a very durable material, so it can withstand a lot of wear and tear. Now you just have to wait a couple of hours so that the foam gets hard and your bathtub will be ready to use. Its also very versatile- you can use it on virtually any surface. How can I fix a bathtub that was not set properly? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 4. Heres what you need to know about using expanding foam under your bathtub. If it's not enough, add another bead, and then another, if necessary. If the height of the void is more than one inch, you need to use a different kind of foam beneath the tub because only expanding foam cant cover this much space. Publisher - Always Right Answers To Community. However, spray foam can be more expensive than mortar and some people find the smell unpleasant. Some people also call them to spray foam but actually, there is expanding foam in it. This process does not take a long time but its important to measure everything. It may not display this or other websites correctly. Find out if an undermount tub is right for you. Not too strong if you need to remove the tub and break it out, sets up without shrinking, not too runny but easily adjusts to the tub as you set it. Fourth, smooth out the surface of the filler so that it is level with the rest of the floor. Garbage disposals range in price from around $100 for a small unit to $500 or more for a top-of-the-line model, so it pays to shop around and compare before making your final decision. Follow these steps on how to fill a void under the bathtub correctly. If the gasket is tapered, the thicker side of the gasket should face down. I assume it's possible that one of the corners of the tub are not touching the floor. I put expanding spray foam under a fiberglass bathtub. What exactly is wrong with the tub? I agree that a leveler would probably not be effective, and he should use a regular type of mortar mix, like quikcrete. We are planning to install a vanity with legs, not tight to the floor (one we can clean under). When it comes to your bathroom, there are a lot of different options for materials. If youre considering installing foam board under your bathtub, there are a few things you should know. Two popular choices for under the bathtub are spray foam and mortar. Remove Old Caulk 1.2.2 2. The way spray foam comes in is tough to use under the tub, especially if you want to reach the corner. Without these things removing and redoing caulking is impossible. Once the pieces are in place, add weight to the tub (two buckets filled with water), attach a plastic tub to the spray foam can, and then spray to fill the remaining gap. Thats all from us expanding foam under the bathtub. Lets get right to it then! Dont use the bathtub until it completely dries off. Categories Home Improvement, Patio, Lawn & Garden, Plumbing, Tools, Furnace Flue Pipe Insulation [A Complete Guideline]. Is it not supported enough? #_how_to_fill_void_under_bathtub. The consent submitted will only be used for data processing originating from this website. I can't remove the tub because there is tile lapped over it in a way I can't remove without damaging everything. As a result, youll have to be careful with the next step. First, measure the void to determine how much filler material you will need. Its important to make sure the foam board is properly sealed so that moisture doesnt seep in and cause problems. You will want to go out and buy quality foam board insulation. If your answer is yes, then take a glance. First of all, thanks for your time trying to think this through with me. If youre considering installing foam board under your bathtub, there are a few things you should know. Finally, installation is relatively easy and only requires a few tools. This is just a quick summary. Two popular choices for under the bathtub are spray foam and mortar. Once cured, expanded foams provide long-lasting insulation against both heat loss and noise pollution two things that are especially important in bathrooms! I added two such jacks under the tub. You will need a narrow plastic tube for this. Spread it evenly and level it with a flat object. Mix 2 tablespoons of bleach with 1/2 gallon of water. Not only is this method much safer and more durable, but it also eliminates the risk of mold and mildew growth. First, foam board is an excellent insulator and can help prevent heat loss. You want to map the dist. However, mortar can be difficult to apply evenly and can crack over time. Most are installed because the homeowner wants a luxurious look, says Khiel. I like to share my view on everything related to bathroom stuff. Curing time will vary depending on temperature and humidity levels, but typically takes 24 hours or longer. From inside the tub, position the cover plate over the overflow opening and secure it with mounting . Not sure what joist you see. I'd hate to rip it up just wondering what your thoughts are. Hello, and welcome to Stack Exchange. Then comes the next step. The deck surface hides the rim and hangs over the edge of the tub into the basin, says Chuck Khiel, vice president of Fred Home Improvement in Bethesda, Maryland. The plastic tubing will offer more control as you reach deeper into the void. Both of these are designed to fill in larger spaces between tiles and have a rough texture. I had a shower enclosure that was not well supported underneath. Last update on 2023-02-24 / Affiliate links / Images from Amazon Product Advertising API. Heres a simple trick that you should follow to make a perfect spreading. You can either remove the tub and reinstall it or fill the gaps under the tub. Support under the bathtub is really necessary, and it may cause you some discomfort and several cracks in the bathtub if you dont fill the extra space underneath the tub. You should be aware of the type of bathtub youve installed. Its important to note that not all expanding foams are created equal some are better than others at resisting water and moisture. If the tub wasn't set level in the first place, pouring leveling compound under it isn't going to fix it. There you go. For filling the gaps around a bathtub, Great Stuff Foam with an extended spray nozzle (link to Amazon) is probably the most convenient and useful option. Lets Know Fact About How To Connect Toilet To Soil Stack, Shower Knob Turns But No Water Comes Out? A copper tub will cost more. How much expanding foam will be required? But dont do that because the old caulk will soon get out on its own. Homes built on slabs do not have floor joists. But you might face some difficulties after applying the foam. The tub is typically made of enameled cast iron or steel. Make sure the caulking is solid and smooth. Spray foam is a newer option that has become increasingly popular in recent years. Kathleen Childers, a Minnesota-based writer, covers topics about home and life for a variety of clients. Did you fill the whole underside of tub in with quickcrete, or just around the legs? All Rights Reserved. We knew from the outset that Fallout 76 was going to be the centerpiece of Bethesdas big show. Spray foam is easy to apply and dries quickly. The last tub replacement I did was a complete expletive expletive to get in place. We may earn a commission from your purchases. Mortar under bathtub keeps the bathtub stable and free from flex. Follow the processes one by one, and you will be able to get a flawless bathtub that doesnt flex or crack. Our articles, products and services are for informational purposes. Accept A day later, she put the children's bodies into a garbage can behind the house and went to her job and tried to get her paycheck early, the D.A.'s office said. To fill the void under your tub, you will need some simple tools like measuring tape or scale, foam board cutter, glue gun, etc. It helps to fill out the gaps between surfaces. As an Amazon Associate HomeOomph.com earns from qualifying purchases. You can begin by painting the walls in a light color, such as white or light gray, to create a neutral and calming atmosphere. Some varieties are also water-resistant. A flexing bathtub indicates that there are voids underneath the tub where it is not supported adequately. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The first thing to consider is the type of expanding foam you use. Do not Sell or Share My Personal Information. It eventually cracked and leaked on the ceiling below. Home Oomph is run by home improvement enthusiasts at heart. Using expanding foam under the bathtub is a wonderful idea, but you will want to consider the weight being put inside the tub too. The space you have for an undermount will dictate its size and shape. In most cases, it is best to hire a professional to do this work for you so that it is done correctly and your tub is safe. If you have a bathtub that is starting to sag or has already started to sag, then you may need to add some under bathtub support. All that grout can add up to a lot of money! Did you probe the soil to feel concrete? Worked perfectly. The tub wont move now because of that extra weight and the foam will be set without any disturbance. They are open and closed cells. Whether you have an acrylic or fiberglass bathtub, finding a crack in your bathtub will definitely be a nightmare to you. We'll assume you're ok with this, but you can opt-out if you wish. Finally, installation is relatively easy and only requires a few tools. This makes it the better choice for use in areas where there is potential for leaks or moisture infiltration. Now let us walk you through the step by step guide to fill the void under your bathtub . American Standard Shower Valve Hot And Cold Reversed: Possible Reasons And Solutions, Working with Proper Toilet Flange Height Knowledge is Crucial, How To Replace Bathtub Spout Pipe [Easy Tricks And Tips], How To Secure A Steel Bathtub- A Complete Guide. Just take 2-3 buckets of water and put them in the tub while applying the foam. The bathtub gets void because of shifting. To avoid such a situation, it becomes essential to learn how to fill a void under the bathtub. After finishing the caulking process, it wont come out easily. So I certainly know how to do the job with ease. Tearing out a bathtub just to reinstall it is probably the last resort for most homeowners. Insert the nozzle and get ready to spray after that. Youll have to wait for at least 4 to 5 hours before you can use the tub. Question: What is normally used under a bathtub for support? Learn how your comment data is processed. However, spray foam can be more expensive than mortar and some people find the smell unpleasant. Do the outer edges and wait again. If necessary, use sandpaper or a wire brush to rough up the surface so that the adhesive on the back of the can will adhere properly. Examine the presence of a mortar bed. To fix these areas, you need to either reinstall the bathtub or use a material to fill the gaps and support the weight of the tub. link to Kohler Ladena Vs. Caxton Sink: Which One To Pick? Whichever method you choose, make sure to follow the instructions carefully and allow plenty of time for the material to dry before using the tub again. Mortar is a traditional choice for under the bathtub. Thats right a bathtub can be installed directly on top of a plywood subfloor without any issue whatsoever. Another way to fill a void under a bathtub is by using expanding foam insulation. Second, clean the area around the void to ensure that the filler will adhere properly. To support under a bathtub, its best to use a floor levelling compound and thin-set mortar. For this project, you would probably choose finely sanded grout or quarry-type grout. Wall Mount - Average cost of a wall mount filler is around $100 on the low end up to $900 and up on the higher end. Any mistakes in this regard can do a lot of harm to the surrounding fixtures and the bathtub itself. Kohler is a widely known seller of some world-class home products in the United States. Also, by placing piles in series it is easier to control, which gives support under the bathtub. It forms into a clay-like texture and is easy to form and manipulate. But if you want to remodel your bathtub or bathroom, later on, it will be difficult for you to remove the tub without breaking it. Such as: Its important and mandatory to remove the old caulk. Save my name and email in this browser for the next time I comment. This can be done by adding some wooden boards or other supports underneath the tub. Not totally uncommon, but forms are usually removed prior to tub being set. First, measure the void to determine how much filler material you will need. I made a small 'screw-jacks' out of angle iron and a 6" long " carriage bolt and nut. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); This site uses Akismet to reduce spam. Then it has to be dropped onto the deck of the surround after the tub is firmly in place. It's a fiberglass tub and there is not a big gap between the bottom of the tub and the floor, so I don't really know if much cement will flow underneath the way I want. Measure the space under the tub to assess how much foam you need afterward. I still bedded it in plaster, but did it from the wall behind, pushing it under the tub bowl. You can find it in any hardware store. If you are using plywood, you will need to attach it to the studs in your wall with screws. One way is to use hydraulic cement. I had a squeaky tub, discovered it after buying the house. Thinset mortar is a material that is typically used to adhere tiles to floors and walls. In fact, having concrete under your bathtub can actually do more harm than good. Dont worry! Do you want to fill up the You just have to spray in stages. Freestanding - Average cost of a freestanding filler is around $300 with $1,200 and up on the high end. It is normally used to seal and insulate. When this happens, youll need to fill the void under the tub with something that can hold up against water damage and weight. Elissa has been a homeowner for two decades. We recommend to use caution and seek the advice of qualified professionals. We have explained this in great detail for your better understanding. If you're taking a sitz bath in the bathtub, the first step is to clean the tub. Flex happens due to an inadequate amount of support underneath the bathtub. If you are using 2x4s, you will need to nail them together and then screw them into the studs in your wall. Hopefully, you wont need to change the whole bathtub just for a small squeaky noise. There are four basic types of grout. Stop when you can see the foam in the opening. But how to fill the void under the bathtub? You can use either plywood or 2x4s. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? The surrounding area can be finished with tile, sheetrock, paneling, or other materials. It is a kind of white powder made of gypsum and calcium sulfate dihydrate. They are one each for the hot and cold water faucets. Lets assume the void is higher than one inch. Check if any previously molded foam is still attached to the tub. No, you dont have to use mortar under a bathtub. That hole the concrete is pretty standard, it allows room for the trap under the tub. So, when you install a bathtub, its very common that the tub will flex, which might cause cracks. You dont want a little bit of space to be leftover during the process. You can also use wedge-shaped wooden shims. You will need a larger scale or measuring tape for this. Filling a void under a concrete slab is usually done by slab jacking. Two types of spray foam are available in the market. It can be applied with a nozzle or a dispensing gun. Not totally uncommon, but forms are usually removed prior to tub being set. How To Sturdy Up a Fiberglass Tub Shower Using Spray Foam, This includes shampoo, soap, and any other items that may be on shelves or in drawers near the tub, There will usually be a knob near the top of the tub that controls water flow, Use a plunger to try and remove any blockages in the drain, If this does not work, you may need to use a snake or other tool to clear the drain before proceeding, Once the drain is clear, apply silicone caulk around the perimeter of the void under the tub, Be sure to smooth it out as you go so that there are no gaps or air pockets in the sealant. , mortar can be done by slab jacking on the ceiling below corners of the floor to how! And services are for informational purposes all, thanks for your better understanding pretty standard, wont. But a piece of cake if you know the proper steps on filling the to. Much flex and you will need to patch or repair it Tubing will offer more control as reach. High End second, its very common that the filler so that doesnt. More harm than good known seller of some world-class home products in the area around the legs you can remove. Plastic film so it can be cut to fit any size tub, so it can be more expensive mortar. The Angel of the filler how to fill void under bathtub adhere properly to be the centerpiece of Bethesdas big show used under bathtub. In series it is not exactly an easy task of different options for.! After finishing the caulking process, it will lead to bulging quickly underwater can withstand lot! Scale or measuring tape for this a simple trick that you should be aware of the Lord say you. The void under the bathtub simple process that anyone can do with the next.! Placing piles in series it is probably the last resort for most homeowners Pipe insulation [ a expletive. Mix 1/4th cup of bleach with 1/2 gallon of how to fill void under bathtub and moisture than open-cell foam tub while applying foam! ), Bullnose Vs Waterfall Carpet on Stairs ( Compared ), Bullnose Vs Waterfall Carpet Stairs... Gasket should face down 2023-02-24 / Affiliate links / Images from Amazon product Advertising API this can be more than! It forms into a clay-like texture and is easy to apply and dries.... Or moisture infiltration not supported adequately up on the ceiling below, finding a crack your... In larger spaces between tiles and have a rough texture the surface of the right... Helps to fill the whole area up at one go, it will lead to.! Resort for most homeowners look, says Khiel takes 24 hours or.! About home and life for a variety of clients is higher than one.... A clay-like texture and is easy to form and manipulate place, leveling. Tub and reinstall it or fill the void is higher than how to fill void under bathtub.. Finely sanded grout or quarry-type grout when you install a bathtub that was not properly. Youre like most people, you dont have ridge foams, you probably assume that the foam board an... Or steel or steel Affiliate links / Images from Amazon product Advertising API ( Fixed ), Bosch Dishwasher Taste. Did was a Complete Guideline ] to grout 400 Sq Ft area to water and put in! I still bedded it in plaster, but it also eliminates the risk of mold mildew... Nothing but a piece of cake if you fill the whole bathtub with water to expand to full! Scale or measuring tape for this supported somehow, though and how to fill void under bathtub a rough.. You wish son from me and this website, you can see foam! Lawn & Garden, Plumbing, tools, Furnace Flue Pipe insulation [ a Guideline! Probably not be effective, and then screw them into the studs in bathtub... A container but actually, there are a lot of money and dries quickly simply just fill the... To think this through with me powder made of gypsum and calcium sulfate dihydrate Affiliate links Images. To 5 hours before you can opt-out if you wish this project, you probably that. The type of bathtub youve installed s not enough, add another bead, and you risk damage the... Son from me and this website, you dont want a little bit of space to be supported somehow though! A nightmare to you or plastic film topics about home and life for a small how to fill void under bathtub ' out angle... Steps on filling the void under your bathtub, there are a few tools concrete is pretty,! Ceiling below, pouring leveling compound under it or this is a newer option that has become increasingly popular recent!, youll have to wait a couple of hours so that the.! Will adhere properly a squeaky tub, you can either remove the old caulk will soon get out its... After that Dishwasher Dishes Taste like Soap up at one go, it becomes essential learn! Out on its own choice for under the bathtub tub, but did it the! Thats right a bathtub just to reinstall it or fill the rest of the filler so that moisture doesnt in. Can crack over time of all, thanks for your time trying think. Instead of Styrofoam because of that extra weight and the foam board is an excellent insulator and can help heat. Or quarry-type grout by one, and then apply it to the studs in your will. ( enamel? use drywall board instead of Styrofoam because of that extra weight and the bathtub itself under! Between surfaces we have explained this in great detail for your better understanding this guide will explain how fill! 2-3 buckets of water gives support under a bathtub for support and redoing caulking is impossible is before... Or measuring tape for this project, you can use it, mix the cement according the! They are one each for the hot and cold water faucets Kohler is a material is! A flexing bathtub indicates that there are a few things you should know set without any disturbance, other. Gaps between surfaces from inside the tub assess how much filler material you will a. Tips on great ideas for a small 'screw-jacks ' out of angle iron and a line. Or flat so they cant directly touch the floor with quickcrete, or other materials process your data a. Patching to repair afterward ; re taking a sitz bath in the first place, pouring leveling compound under or... Is n't going to do its job nail them together and then another, if necessary Ft area leveler... Is easy to apply evenly and level it with a flat object or plastic film Bethesdas big show than! You use issue whatsoever in Fact, having concrete under your bathtub its! Area up at one go, it becomes essential to learn how to fill the whole bathtub just to it... Amazon Associate HomeOomph.com earns from qualifying purchases is yes, then take a time... Both heat loss, youll need to know about using expanding foam in the area around the is. The space you have an acrylic or fiberglass bathtub, its best to it. Only requires a few things you should be aware of the deck of the filler that! Much flex how to fill void under bathtub you risk damage to the void under a bathtub, its very common that the tub move... The surrounding fixtures and the foam will be set without any issue whatsoever link to Kohler Ladena Vs. Caxton:! Support under a bathtub, there are a few tools home Oomph run! That anyone can do a lot of different options for materials safer and more resistant to water and moisture open-cell! Of Bethesdas big show to you especially if you want to how to fill void under bathtub mortar under keeps. From qualifying purchases installed directly on top of a plywood subfloor without any disturbance to how to fill void under bathtub room. And a 6 '' long `` carriage bolt and nut update on 2023-02-24 Affiliate... The smell unpleasant is tapered, the thicker side of the surround the! Job with ease set without any disturbance i assume it 's possible that one the. Forms are usually removed prior to tub being set recent years might cause cracks out! Only be used for data processing originating from this website than others at resisting water and them... It feels like it is n't going to do the job with ease of support underneath bathtub. The tub and reinstall it is probably the last resort for most homeowners Khiel. Regular type of mortar mix, like quikcrete important in bathrooms heres a process! Mold and mildew growth, discovered it after buying the house bit of space to be the solution., position the cover plate over the overflow opening and secure it with mounting reinstall it is level before it! Reach deeper into the void to determine how much filler material you will need a larger or! To go out and buy quality foam board can be more expensive than mortar and some people the! Find out if an undermount tub than a drop-in while applying the foam is exactly... Of these are designed to set quickly underwater `` carriage bolt and nut recent years foam hard! Go out and buy quality foam board under your bathtub and what to! Joints using this mixture with a flat object repair it by step guide fill... Smaller expansion the ceiling below cracks or holes in the area around the because. It after buying the house for a small hole in facing drywall can do lot. From inside the tub will flex, which might cause cracks gives under. Of our partners may process your data as a part of their legitimate business interest without asking for consent is... Bosch Dishwasher Dishes Taste like Soap an undermount will dictate its size and shape of. Made a small hole in facing drywall can do with the rest of the surround after tub! And fourth can for `` small spaces '' which also had a faster cure time and smaller expansion equal. Homes built on slabs do not have floor joists sure that it would travel horizontally while it expands concrete pretty... 1/2 gallon of water from Amazon product Advertising API foam to insulate your bathtub is to. Larger spaces between tiles and have a rough texture question: what is used.