Model # MLMW30

Internet #202753973

Store SKU #230655

Store SO SKU #1000115345

Custom Building Products MegaLite 30 lb. White Crack Prevention Mortar

Custom Building Products

MegaLite 30 lb. White Crack Prevention Mortar

  • MegaLite crack prevention mortar white 30 lb.
  • Maximum flexibility to prevent cracks in tile
  • Unsurpassed bond strength
$3997 /each
store icon Loading Buying Options...
package icon Loading Buying Options...
Sorry, but we ran into issues loading these options. Please try refreshing.

Frequently Bought Together

Product Overview

The MegaLite 30 lb. White Crack Prevention Mortar is the ultimate performing lightweight mortar protects against cracks up to 1/8 in. (3 mm). Offers the ultimate in bond strength for the most demanding installation requirements with the flexibility to withstand horizontal substrate movement up to 1/8 in. (3 mm). Formulated with CustomLite technology, it's 40% lighter than other mortars, providing excellent handling characteristics and offers non-sag, non-slip installation on walls. Diverse in application, it is capable of thin-set or medium-bed use up to 3/4 in. (19 mm) thick on horizontal surfaces after beat in. Non-slump, medium-bed features provide the ultimate support for large format tile and stone. Formulated with premium white cements and select recycled content for a pure white backdrop for the delicate installation of hard-to-bond glass tile. A 30 lb (13.6 kg) bag covers the same area as a 50 lb (22.68 kg) bag of traditional mortar. Use for interior or exterior floors, countertops and walls.

California residents: see   Proposition 65 information

  • Maximum flexibility to prevent cracks in tile
  • Unsurpassed bond strength
  • Non-slump for floors; sag and slip resistant for walls
  • Lightweight - 30 lbs. covers the same area as 50 lbs. of traditional mortar
  • Exceeds ANSI A118.4TE, A118.15TE and A118.11 without the need for additives
  • Formulated with recycled material and contributes to LEED certification

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.



Maximum coverage area (sq. ft.)
Product Width (in.)


Additive required
Color Family
Color Family
Commercial / Residential
Commercial / Residential
Dry time (hours)
Floor/wall use
Floor and wall
Flooring Material Features
Mold/mildew resistant
Flooring Product Type
Flooring Powder Mortar
Flooring Use Type
Mold and mildew resistant
Product Weight (lb.)
Product type
Use Location
Floor,Interior wall

Warranty / Certifications

Manufacturer Warranty
1 year product

More Products With These Features


Customer Questions & Answers

If you seal it in an air tight container, can you reuse it if you can't complete the job in one day?

Asked by: Phil61
No. Tile mortar must be used within a short time. Speed set mortars have an even shorter open time. Thin set mortar will still set up when there is no air.
Answered by: JT
Date published: 2016-10-09

Newbie here. I am about to install white limestone over my newly re-built brick fireplace, and ov...

Newbie here. I am about to install white limestone over my newly re-built brick fireplace, and over the 1/2" hardie-backer wall above the bricks. The limestones are 12" x 24" x 1.25" thick, and extremely heavy—weights in at~13lb/sq-ft. I am debating between this MegaLite vs. Natural Stone and Large Tile mortar. Home Depot does not have MegaLite in stock, and will take ~10 days for delivery, while NSLT is in stock. Question: 1) should I wait and go for the MegaLite (better bonding and safety in earthquake prone Los Angeles area), or will either product work well enough? 2) what is the ideal trowel size and mortar thickness to do the job right?
Asked by: Firsttimer
I have used MegaLite, but not NSLT. When in doubt, you can always call the Custom techincal department, as I have always found them helpful. That said, there won't really be all that much force trying to pull the stones off the surface because they'll either be stacked or you'll have grout between them, so they'll rest on each other all the way down to the brick. I'd be very comfortable using NSLT and just make sure you follow some good practices. First, be sure to mix it properly, don't re-thin it after mixing by adding more water, and make sure to wipe down both the HardieBacker and the limestone with a fairly moist towel just prior to installing each stone. You don't want any dust on either surface to weaken the bond. If the limestone is rough or scored on the back side, that's good; if it's smooth, you could consider gently dragging a diamond blade in a small angle grinder randomly across the back side to roughen it. Stuff sticks pretty well to HardieBacker if it's clean, so that won't be a concern. To install, I'd start by troweling on a very thin coat of thinset on the back of the stone with the end of the trowel or a wide knife to get it completely wet (e.g., "back butter"), and then use a 1/2"x1/2" trowel on the HardieBacker, again making sure to leave no spot untouched before leaving the ridges. The goal is to have maximum coverage between the surfaces. If you'll be stacking the stones on each other (no grout spaces) I'd run the trowel ridges vertically to help avoid getting thinset between courses. Begin to apply each stone about a half inch to the side from where it'll end up (e.g., offset perpendicular to the direction you ran the thinset), and then slide it into place as you press on it to make sure you get maximum coverage. Assuming the bottom course is resting on the brick (or full depth spacers sitting on the brick) and you work upwards, there should be no issue with stones pulling away while the thinset cures.
Answered by: Rick
Date published: 2017-06-29

I"ve had an external balcony made with Gypsam it was coated with Emer Proof waterproofing membran...

I"ve had an external balcony made with Gypsam it was coated with Emer Proof waterproofing membrane. The tiler then used MegLite white as the adhesive, then layed and grouted (with grey) the ceramic tiles. Now when it rains, where the water sits we have a sticky white substance that comes through the grout and trickles over the edge of the balcony. It washes off with tap water but reappears as soon as it rains again. It now looks like the grout is also breaking down as a grey substance is also appearing. The job is only 3 months old but happened from the first rains we had and is getting rapidly worse. I'm wondering if there is a step in the process that someone has missed and whether the products under the tiles have reacted against each other and are consequently breaking down? Thanks
Asked by: Reno2017
In order to give you the best possible answer we would like to know a few more details about your installation. Please contact our technical services department at 800 272-8786 option 2.
Answered by: CustomBuildingProducts
Date published: 2017-03-21

Can this be used for tuckpointing exterior brick

Asked by: Gary
Wrong product. This is a mortar for adhering tile. It is not the kind of mortar used for exterior brick.
Answered by: JT
Date published: 2016-10-09
  • y_2017, m_7, d_25, h_13CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_10
  • loc_, sid_202753973, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 14ms

Customer Reviews

MegaLite 30 lb. White Crack Prevention Mortar is rated 4.3 out of 5 by 10.
Rated 1 out of 5 by from I liked how light and easy this was to spread, but I spent a lot of time removing large pebbles f... I liked how light and easy this was to spread, but I spent a lot of time removing large pebbles from my project after I spread the mortar, some as large as 1/2 an inch. At first I thought some mortar just hardened up, but after I scratched a piece up with a screwdriver, I realized it was actually large pebbles. I guess I'm going to have to find a store that carries Flexbond LFT because I'll never buy this stuff again.
Date published: 2017-05-01
Rated 5 out of 5 by from Easy to mix, hardens even when wet, sticks like nothing I've ever used before. Used to adhere gla... Easy to mix, hardens even when wet, sticks like nothing I've ever used before. Used to adhere glass tiles to swimming pool. Even before grouting, a pressure washer didn't pull off even one tile! Wish it wasn't so expensive, and Home Depot raised the price 30% last week!
Date published: 2017-03-28
Rated 5 out of 5 by from The product was very good but it was special order with VERY SLOW delivery. It is not stocked in ... The product was very good but it was special order with VERY SLOW delivery. It is not stocked in the local stores. I ended up having to go pick it up from a local delivery service in order to get it on time.
Date published: 2017-07-11
Rated 4 out of 5 by from Really good product Our tile contractor recommended this product. Finishing comes really good.
Date published: 2017-05-16
Rated 5 out of 5 by from This is a lightweight, but strong mortar that I used it to tile my 25 sq ft bathroom floor (1st t... This is a lightweight, but strong mortar that I used it to tile my 25 sq ft bathroom floor (1st time). Initially I went with the Thinset, after taking the Home Depot Installing tile workshop, but I wasted about 3/4 of bag of thinset trying to figure out how much to use. There were too many lumps. Though the instructions read that you can mix by hand, FYI - You will benefit from using a power tool and mixer attachment to thoroughly mix the product with water. (I'm still trying to figure out out to get the hardened thinset out of the orange bucket.) I was concerned that I would waste a large quantity if I used the entire bag. So, i read another reviewer's response on how to determine the right quantity of the product if I didn't need it. (Think of peanut butter consistency. So, I added water and product until it reached the smooth peanut butter consistency and gauged how much to use for the job. I completed tiling and grouting and I still have approximately half of the product in the bag left to use for another bathroom. I could have used a little less, but for a first timer, I am very pleased with the MegaLite 30 lb. bag. Now on to completing the rest of the job.
Date published: 2016-11-05
Rated 5 out of 5 by from A Great Thin Set for Challenging Environments I used this thin set for what is certainly one of the most challenging environments for tile work: outside on a wood framed deck in Colorado. If it works for this, it'll work for just about anything. Last year I built my first large outdoor, waterproof, tiled deck with 18"x18" porcelain field tile, and this thin set has now survived multiple snow storms, followed by bright sun and the associated dozens of freeze/thaw cycles over the past 9 months. It's holding up very well to date with no sign of any issues. I am now in the process of building two more similar but smaller tiled decks and using this thin set again. The decks are constructed from engineered framing materials, covered by plywood, backer board and a waterproof decoupling membrane (made by the Noble company in my case). The surface does, as you would expect, expand and contract somewhat with temperature and humidity swings. I picked MegaLite thin set for its flexibility, and it is also the stickiest stuff I have ever worked with. When I first started using it for the larger format tile, I placed one tile using a 1/2"x1/2" square notched trowel on the substrate and back-buttering the grid on the back of the tile. I then pulled the tile back up to check for 95-100% coverage, which is critical for tile work outdoors, and it was all I could do to pull up that tile using two floor chisels and going very, very slowly so as not to break the tile. The stuff definitely grabs. I went through 24 bags for the first deck, setting just under 1,000 sq ft of tile. Using a light weight thin set is a little different than other thin sets... the consistency is very different and it skins over more quickly. This latter feature is something you need to factor into your tile setting approach because you definitely want to have no skinning when you set the tile. So you just need to have your tile pre-cut, trowel out for small groupings of tile at a time, work quickly and re-stir often (as with any thin set, don't add more water to thin it... toss it when it gets too thick). About 30 minutes after setting a tile, it's pretty much there for life. Cleanup is also more difficult than with a typical thin set because the stuff adheres more to buckets, trowels, your hands and anything else it touches; but that's expected and is a good thing as it's an indicator of how well it sticks. Time will tell how well MegaLite holds up through seasonal cycles, but I have no reason to believe it won't. I also like that you can build up the thickness of this stuff to as much as 3/4" when a thicker application is needed. I now also use this product when I have to set larger tile on a shower ceiling as I have no worries about tile coming loose either during or after installation. It's overkill and a little more tedious for less challenging tile work, especially given the cost, but when you have a tough job it's definitely a thin set to consider.
Date published: 2016-04-20
Rated 5 out of 5 by from works very well, but expensive It's pretty expensive. I used it for our 7'x4' shower where we tiled all the way to the ceiling with large format glass tiles. So, i spent hundreds of dollars on thinset alone. That said, I needed the lighter weight and flex this thinset gives. I recommend you mix it just a smidge on the thin side to give you more working time or mix it in smaller batches. It starts to harden a bit faster than other thinsets I've used. When you mix it just a bit lighter than peanut butter, it trowels out nicely and the back butter on large format tiles is smooth as well.
Date published: 2016-06-28
Rated 3 out of 5 by from Works good, but dries WAY too fast. This is a great value for glass, porcelain and just about any other material you are installing. HOWEVER, this stuff skins up in under 5 minutes. I don't understand why all of these "light" thin sets dry so quickly. If you are doing a backsplash or wall, and you have cuts to make, you will be lucky if it's not skinned over on the wall by the time you get back. I am sure there are many applications for this thinset that would be great, but this is my experience. It sticks great, it is very light, and good quality however.
Date published: 2013-04-03
  • y_2017, m_7, d_25, h_1
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_10
  • loc_, sid_202753973, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 60ms