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Skeewbackers v Wedi v Cement Board

One of the many wonderful characteristics of mosaics is their durability. Who knows how many generations can enjoy the art made from glass, china, ceramic, and stone tesserae? We do know that we can easily find mosaics that are 1,000 years older than the oldest paintings.

Choosing the right substrate for your mosaic is critical to its longevity. A mosaic that may get wet should be on a moisture resistant or waterproof backer. Cement board has been around the longest and may thereby be best known, but Skeewbackers are becoming widely recognized as a much better solution even better than Wedi board.

Yet there are still a lot of questions about how they compare. So we set out to find and report on the differences. But first, there are similarities. They are all:

  • engineered for wet areas
  • are usable indoors and outdoors
  • able to be scored and snapped or cut with power sawsz,

Here are the differences:

Construction - Cement board is a combination of cement and reinforcing fibers formed into sheets of 3 feet by 5 feet or 4 feet by 8 feet.

Wedi is made with a dense polystyrene foam core sandwiched between thin layers of concrete which are reinforced with fiberglass mesh. The fiberglass mesh sticks out beyond the board and can be difficult to trim.

Skeewbackers are similar to wedi board with a high-density, waterproof extruded polystyrene core but they have a reinforced, waterproof membrane on both sides to give triple protection from water and vapor intrusion. No cement dust, no fiberglass mesh issues. Straight from the manufacturer:  "HYDRO BAN Board® is a lightweight easy to handle and ready to tile wall board designed to be used in bonded tile or stone installations. It is made with a high-density, waterproof extruded polystyrene core and a reinforced, waterproof membrane on both sides to give triple protection from water and vapor intrusion. Available in a variety of thicknesses from 1⁄4” to 2” (6 mm to 50 mm) the HYDRO BAN Board can be used on walls, floors, ceilings, and in many installations requiring dimensionally sound and stable substrates as well as in steam rooms and steam showers. HYDRO BAN Board does not contain cement, fiberglass or paper products and will not cause itching or create messy cement debris during installation. No tab washers are required for floor and wall installations when using the ceramic coated HYDRO BAN Board Screws."

Weight - One square foot of ½ inch thick cement board weighs 40 ounces, wedi is 11 ounces, and Skeewbackers are the lightest at 5 ounces.

Water tightness – Cement board is water and mold resistant and Skeewbackers and Wedi is waterproof.

Shape - Cement board is not shapeable. Skeewbackers and Wedi can be shaped but wedi board has a cement and fiber coating that makes scoring tricky as it can crack and break. Skeewbackers cut and shape cleanly with no cracking or fibers.

Dimensions – Cement board is available in sheets with a thicknesses of 1/2 and 5/8 inch; widths of either 3 feet or 4 feet; and lengths of either 5 feet or 8 feet. Skeewbackers are available in ¼” and ½” and more thicknesses and lots of sizes and shapes as well as large panels. Wedi is available in sheets or panels with thicknesses 1/8, 1/4, 1/2, and more up to 4 inches; widths of 6 to 24 inches; and lengths of 6 to 24 inches.

Availability – Cement board is only available from building material suppliers and must be picked up at the store. Skeewbackers are available at and are shipped worldwide. Wedi is also available online from mosaic supplies websites and may be available in local stores.

Cost – there is a large difference in their cost. Skeewbackers and Wedi board cost more than cement board, but the advantages outweigh cement board hands-down.

It is my opinion in working with all of the above backers, that foam-core backers provide the best option for mosaic backers and Skeewbackers are my favorite due to their lightness, ease of cutting, very clean edges.


  • Hi Diane! For smaller mosaics using wedi or our Skeewbackers, our 1/2” thick hangers (if your boards are 1/2” thick) work well as you can hang these sizes like a picture if you wish. Or you can use longer screws and screw them into a wall for a permanent installation. Here’s a link to how these hangers are to be installed: – these work on both wedi board and our Skeewbackers.

    Another option to hang these are to use French Cleats – I don’t have instructions on those but you can google it to learn more about them.

    As far as concrete boards, I personally don’t use them anymore since we have the lighter boards available now.

    Lou Ann
  • I am a professional mosaicist. I usually mount my huge public installation mosaics upon plaster walls. However, I want to create smaller mosaics (18×20 inches+-) in my mosaic workshops using wedi, concrete or skeew.

    Can you please instruct me on how to install a hanging system to those substrate boards?
    Thank you. Dianne

  • I am want to mosaic on a table top that would be in hot and cold weather . Could you tell me what to use that would work and be heavy enough plus have the thickness on edge(round ) to place tiles on? Thank you

    Debora Shaw
  • Hi
    Do you currently have any suppliers of Skeewbacker or Wediboard in South Africa?

    Lyn Nicol
  • Caroline, here is a link to our large boards for your consideration: – please chat with me when you are on the website and I can help further there. Thanks! Lou Ann,

    Lou Ann Weeks

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