Hot mop shower pan

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Planning for a bathroom renovation?

Designer bathrooms are soaring in popularity these days. Depending on the needs, desires, and lifestyle of the users alongside the latest trends and designing fashions; bathrooms are being planned or renovated. Right from the wall tiles and floor tiles to the selection of the right kind of bathtubs, shower panels, and washbasins, many things are there to consider while planning for the construction or remodeling of bathrooms. But with so much attention is being paid to other aspects of a modern-day bathroom; waterproofing of the floors too must not be snubbed.

Ready To Explore Different Options To Waterproof Your Bathroom Floors? Let’s Check Out Reasons Why Bathroom Waterproofing Is Crucial, Along With The Methods To Achieve So!

Compared to any other areas; the bathroom is the most showery and moisturized area of any building.  Bath spaces are extremely exposed to humidity, moisture, and water and thus, are prone to damages, water leakages, and outflow in tiles and fixture joints. To avoid all such long-term home designing blunders; the floor of your bath space must be adequately waterproofed. Waterproofing ensures your bathroom to be completely waterless within few minutes of showering and keeps it spick-and-span and sparkling always.  Other major benefits of bathroom floor waterproofing are as follows:

  • The biggest advantage of bathroom floor waterproofing is that it helps to prevent water leakage and thus further damages to walls, ceilings, and other bathroom fittings.
  • By saving extra water leakage and maintaining water tightness, you, obviously can save a lot on your water bills and make your home more energy-efficient.
  • Waterproofing of bathroom floors is a great way to prevent the growth of unwanted microbes, ugly bacteria, and nucleuses caused by constant dampness.
  • Bathroom floor waterproofing is a great insulator for any home. It improves the insulation of your entire home by containing the heat inside only.
  • With bathroom waterproofing, you can increase the overall real estate value of your home and make it appealing to potential property buyers.

Different Ways To Waterproof Your Bathroom Floor

There are many different ways to waterproof your bathroom floors. Each method focuses on a single aim – to create a strong barrier below or above the floor surface and to prevent water to pass through the surface. Properly applying waterproofing methods help to preclude flooding, humidity, wetness, and moisture in the bath spaces. However, among all the methods available, two of the most popular bathroom floors waterproofing methods that are trending in today’s market are:

  1. Hot Mop Waterproofing
  2. Membrane Waterproofing

Let’s check out the pros, cons, features, and perquisites of both methods!

Hot Mop Waterproofing – Secure & Reliable Waterproofing Method

When it comes to waterproofing the shower, floors, and other bathroom areas, hot mopping is considered one of the most effective, feasible, and viable solutions to consider. Hot Mopping basically is the procedure of waterproofing the tiles, shower panels, and floors with multiple layers of hot asphalt and felt paper. The application can be useful in versatile methods but mostly relates to waterproofing of grounds and showers in the bath spaces.

A leaking floor can foster bacteria, mold, mildew, and eventually result in costly water damages. But with multiple layers of hot mops, you can fill in the pours and escapes of tile and grout. A specially designed hot mopping application can provide adequate protection against water leakage, tile breakage, and poor waterproofing in the long run. For bathroom waterproofing, you can blindly trust the quality and dependability of hot mops over any other kind of waterproof method.

Why Hot Mops?

  • Hot mop pans work better and longer than any other bathroom floor waterproofing method. It is excellent in tile insulation and keeps your property protected against water damages in the long run.
  • The heated tar of hot mops when applied to the shower pans and floors; can provide a fully sealed, most waterproofed, and protected bathroom ever.
  • By acting as a robust water-tight crust below the bathroom tiles; it prevents leakage in the shower pan, tile breakage, and water outflow in tile pours.
  • Made from the highest quality liquid heated tar and three-layered roofing grade felt; hot mops last for longer than other waterproofing applications.
  • Hot mops help to reduce the humidity inside the bathroom and prevent further water damages to other fixtures and appliances.

Membrane Waterproofing – Stronger Prevention For Bathroom Leakages

Talking about waterproofing bathroom floors and forgetting CPE/PCV membrane is not just possible! Available in two forms, i.e. liquid membrane and sheet membrane, this method can be more durable and effective for waterproofing the washroom floor. A waterproofing membrane comes as a thin layer, made of water-tight material. It is laid over the bathroom surface or structural slab or even below the finish tiles precisely so that passage and leakage of water can be prevented.

It effectively deals with the extreme humid conditions of a wet room and absorbs water right after showering. It also copes up greatly with fluctuations in water production inside the bathroom and ensures better and more robust tanking. While hot mopping can last for almost 15 years after application; CPE/PVC sheets always last longer. Once properly applied and installed, membrane sheets can last for a lifetime and ensure better and around-the-clock waterproofing in the wet floors.

Why Membrane Waterproofing?

  • Despite being thin, the layer of water-tight membrane prevents water to pass through it and keeps the structural slabs and tiles of the bathroom completely waterless and gasping.
  • The waterproofing membrane is highly strong, flexible, robust, tear-resistant, and long-lasting, which makes it an ideal choice for any kind of bathroom floor.
  • Plus, the sheets are so flexible and elastic that they can take any shape and be stretched to cover any ranges of cracks in the tiles, walls, and other bathroom features.
  • Both the sheets and liquid membranes are easy to work with and can be installed effortlessly than other applications.
  • The waterproofing membrane is suitable for any surfaces including the foundations, walls, tiles, roofs, and other parts of the bathroom – no matter if they are made of concrete, leather, or any other fabric.

The Hot Mopping Experts

Protect Your Investment

When tile is going to be installed in a shower, the waterproof membrane also known as the shower liner or hot mop becomes the insurance policy that makes the entire shower installation perform. Under upstairs bathrooms and showers are rooms filled with your personal belongings, valuable family heirlooms, art work, electronics, and computer equipment. Therefore, no compromise should be accepted for installing the best and most durable waterproof shower liner possible.
A hot mop shower pan is the most superior shower liner available.

With over 15 years in the hot mop shower pan industry, Ojeda hot mopping has covered most of California taking care of the needs of Contractors, Homeowners, covering residential and commercial jobs small to large. With our friendly and reliable staff you can call to make your appointments hassle free, we have an office that answers all your calls and keeps us running smooth.
It is important to us to keep your project on schedule!

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After a very tiring day at the office, you come home, and the first place you go is to your bathroom to take off all the stresses from your body. But what happened to the shower?

Damn! It’s happening again. The shower pan gets a water leakage. After all your efforts in waterproofing the shower, it’s all gone in vain!

Shower Pan Hot Mop vs Membrane

So, the next step should be waterproofing, of course, but which one is the best between shower pan hot mop vs membrane?

Well, if you are struggling to choose between hot mop and membrane to waterproof your shower pan, you have landed in the perfect place. We will make sure you get your hands on the right one to fix your bummers within no time; stay tuned!

Hot Mop Setup

For the setup, you must know how the hot mop is constructed. Four layers of hot tar along with 15 pounds pierced felt (3 layers) form a sandwich shape in which the pierced felt paper is used for the layers.

Then, one-fourth of the mortar mix cement per foot should be pre-pitched by a trained professional before mopping in your shower pan. This is required because it will allow the water to flow directly into the weep holes over the hot mop if it penetrates through the tiles.

hot mop setup

Next, you can either select cast iron or a plastic-made shower drain that includes a test stopper to stop the water. The number of shower drains must be 2 pieces that have a drain flush set up.

Note: For an existing shower drain, it’s better to check the hot mop from the 2 ribs.

To support the mop paper 2 times, it’s a must to use 10 blocking against the wall studs. Before covering the benches and seats with plywood, you have to make sure that it has a strong build quality.

To support the mop paper 2 times, it’s a must to use 10 blocking against the wall studs.

After that, you’ll have to add a specific amount of glue to the paper and mop on the face of the bench by just following the flat surface.

Now, your duty is to stack a minimum curb and extend the mop around 3 feet of height above the shower pan. What’s next? You’re done, and from now on, you can use your shower for years and years at a stretch.

Membrane Basics

The shower membrane basically solved all the previous problems by placing a waterproofing layer directly under the tile layer and combining it with relaxation.

As the shower floor and shower walls are exposed to a lot of moisture and large temperature changes, in a place like that, the grout line can break also.

setting waterproofing membrane for showers

Without the release membrane, the bottom plate can expand and contract at a different speed than the top layer of the tile, which causes the grouting line to crack.

Uncoupling is achieved by not attaching the mortar to the foil itself but only to the non-woven fibers (small plastic hairs) on each side of the foil. This creates a small opening in the underside of the fleece on both sides of the membrane.

Sheet membrane systems use a precast/shaped membrane element to seal the corners of the spacious shower. Paint or adhere these parts to the membrane in a similar manner.

A liquid waterproofing membrane can be considered as a waterproof coating for your shower, as the most common method of application is using a paint roller. You can also spray it with a spray gun. It acts like a rubber layer that remains flexible even after drying.

It is the cheapest and easiest way to waterproof the walls and floors of a shower and, in most cases, provides good protection when used correctly.

The crack isolation membrane cavity minimizes the risk of rewinding almost every nozzle and tube of lead in the fleece.

So, What Are the Differences?

As we can see, both are suitable and can be a great option for waterproofing your shower pan.

Talking about the drying period, the hot mop takes a pretty long time compared to the membrane. But the bonding it creates is super-duper, and of course, it’s far durable than most of the membranes.

The applying process might be a bit different as well. Unlike the hot mop, the membrane can be applied through sprays, spray guns, paint rollers, or such things to make the job done. In that case, it’s more user-friendly and compatible with all types of users.

Speaking of the price range, the hot mop is a bit steep. So, if you’re unable to break your bank, the membrane is what you need to consider in terms of waterproofing your shower pan.

Final Thoughts

That was all about the shower pan hot mop vs membrane from us. Now that you know all the information about these waterproofing types, choosing a single one depends on your choice, budget, and requirement; the ball is in your court!

Read more:

Shower Pan Hot Mop Services - So Cal Hot Mopping by Ojeda


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Tile and grout have pores. When you take a shower, most of the water runs down the drain. Whatever water or moisture is absorbed by the tile and grout is caught by the shower pan, and sent down weep holes in the drain. All of this happens below your tile shower where you cannot see. That is why it is so important to have a water tight membrane below your tile.

The most reliable and trusted tile expert in the world established
excellence in tile installation, recommends the hot mop shower pan method over other methods such as a vinyl shower pan liner.

A prefabricated shower pan membrane provides inadequate protection against waterproofing in the long run. You should trust the quality and reliability of a hot mop shower pan over any type of waterproof membrane. A shower liner can puncture much more easily than a hot mop shower pan which is made from liquid heated tar and three layers of roofing grade felt. The heated tar is applied to the shower pan and fully seals, waterproofs, and protects much better than a shower pan liner.

What are the main problems with vinyl shower liners?

A leaking shower pan can cause a great deal of damage to one’s home or property. Not only the tile work needs to be demolished, water damage to your personal property can cause a big headache. It is for this reason that majority of veteran contractors choose a hot mop shower pan over a shower pan liner. Always choose a hot mop shower pan over a vinyl liner.


Mop pan hot shower

What & Why you need Hot Mop?

Hot Mop is an application of water proofing for all showers and decks; that are constructed of tile, stone, marble, etc… This is important because water penetrates into your tile and cement; without Hot Mop Liner water will seep into your studs and wood floors. This can cause wood rot which will seep under vinyl floors, and under the walls up to the next room; which can destroy your drywall, wood, and carpet. Without a Hot Mop of your Shower and/or decks you can destroy what you already have, instead of improving it. It is like have a house without a roof!


Things You Need To Do Before We Hot Mop: 

  • On remodels – Be sure to tear out the Tile, Mud Work, Hardy Backer, Wonder Board on the side including the bottom Sub Floor of your shower, Including the Old Hot Mop up to the studs. Everything must be clean! It is necessary to take out all lose nails, wires, old paper left behind, and even vacuuming may be necessary. What is only needed is to see the studs or plywood partition on the sides of your shower… The smoother the surface, the better Hot Mop pan will turn out.
  • Do you have Backing in your shower?Or in between your studs? If not, you can put “2&#;8”, “2&#;12”, or “2&#;6” this ca be nailed in between your studs flush to the stud floors. (Don’t worry about the areas where there are pipes.) If you have Bench, Seat or Tub edge in your shower, It must be certain it is with plywood so we can Hot Mop up to that area.
  • Dam – Nailed Three “2&#;4” together or One “4&#;6” for a DAM… (See Diagram A to know about the importance of DAM)&#; Note: For a Handicap Shower, it is the best to recess the shower floor at least 2 inches so you don’t have to put a DAM.
  • Do you have the correct drains? It is superlative to put in a new Drain and essential the Bottom Flang is flush to the floors. It is the best to use a 3 Bolted Cast Iron Drain. ( See Diagram A on how to install new drain at the correct height)No Guarantee: there is No guarantee for plastic drains. It can work however the bolt holes can strip out tightening. Also it can cause major leaks and can warp from heat… Plastic Drains with 4 bolts should not be used; for reason that it is only specifically made for vinyl pan liners. However, we can make it work with small modification.
  • NO Mud Work, Hardy Backer, or Wonder Board should be started before the Hot Mop Pan is installed.


You should water test your Shower Pan for 24hours to ensure there are no leaks.

Never put Nails or screws on the Hot Mop or lower than 3 inches above the Dam. Pounding too hard and close to the floor can cause cracks and damage in the Pan where the floor meet the walls. Small Cracks and Damages will result leaks and the final outcome will result in total failure…

If you have followed and completed all the instruction correctly, Now is the time to give us a call!

hotmop showerpan drain proper drain for hot mop shower pans , showerpan drain plumbing shower drain

Robert Lamoureux: Hot mop vs. vinyl shower pan liner, bathtub shell

Question No. 1

Hi Robert,

I own a home in Canyon Country and am in the process of remodeling on two of my bathrooms. I’m doing some of the work but contracting out certain aspects. I’m currently at the point where I need the shower floors hot mopped and have also been told that there is a better product, a vinyl product.

Ultimately, the information I’ve received on both leaves me in a quandary on which is the best route, so that is why I’m reaching out to you, for your expert opinion. Whatever you tell me is the best option is what I’m going to go with.

Would you please give me your thoughts on which is best and why? I really want to do this the right way and not have to worry about any seepage or leaking, forever if possible.

Answer No. 1

In the early days, all I would use is the hot mop.

However, over time, due to age and the thickness that the hot mopping is put on, it cracks and causes leaking. It is essentially like roofing tar, so is susceptible to aging and cracking/drying.

Once the vinyl system came out, I began using that, and it is the only way I’ll go anymore. It can best be described like a swimming pool liner. However, it is thicker than that. The liner is put in, molded to the floor and then the concrete is placed on top of this, followed by the standard tile project.

In over 35 years, I’ve never had one of these fail. However, previously, the hot mopping did occasionally fail.

For me, the vinyl is the only option. I would absolutely recommend this route to you.
— Robert

Question No. 2

Hello Robert,

In one of my bathrooms, I have a bathtub/shower combination that is covered with a plastic (?) shell/liner. When I bought the house 10 years ago, one area in the tub was glued. Well, now it cracked and I need to fix it. I want to keep the same setup. I heard about putting a new shell/liner over the old one; however, I also read that many who did this had issues.

What is better, replace the shell/liner or install a second layer or even replace the whole setup, which would be more costly?

I would welcome any suggestions to have the job done correctly.

Also, would you know a local company with a good reputation who would do a good job? I believe in supporting a local business with good reference, in exchange for a job well done.

I am looking forward to hearing from you,
— Daniela

Answer No. 2


Everything depends on one’s budget. In a perfect world, I’d tell you to take it out and start from scratch. If the budget is the issue, I would remove the old liner and replace it with a new one if the style is still available. I don’t know of a contractor who works on the liners you are describing. I’d try a local tile and tub store and see if you can get a lead from them. There are companies that can do a repair and then top-coat the tub. There is a company called Cerma-Coat that you may want to reach out to. They are based out of Van Nuys. I’d call them and get their input, 800-789-2284. Good luck,
— Robert

Robert Lamoureux has 38 years of experience as a general contractor, with separate licenses in electrical and plumbing contracting. He owns IMS Construction Inc. in Valencia. His opinions are his own, not necessarily those of The Signal. Opinions expressed in this column are not meant to replace the recommendations of a qualified contractor after that contractor has made a thorough visual inspection. Email questions to Robert at [email protected]


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