Kitchen Design/Remodeling/glass mosaic backsplash



I just installed 3/4" glass mosaic backsplash, but I haven't grouted yet. I used Mapei Adesilex P10 mortar w/ polymer to attach the tiles. It's probably about 14 hrs since I finished. I'm concerned about how well the tiles are adhering to the mortar. I tested a spot, and was able to gently pull a tile off, so the adhesion was not very strong. I'm just not sure how strong the bond should be at this point. Any advice on this would be appreciated. I'd like to have a better understanding before I proceed to grouting after 48hrs.

Thanks, Matt

Hello, Matt.

It sounds like you used the right material to install the tiles; I double-checked websites to verify. I've also used the same product with excellent results for setting glass mosaic tiles. Something else is probably causing the problem, but I don't know what it could be. You shouldn't be able to pull the tiles off the wall that easily.

I suggest that you call a professional tile setter, explain your problem, and ask for help. You could also re-submit this question and ask for a tile setter (if AllExperts has one). I don't have much faith in "big box store" employees to answer technical questions like this, unless you happen to get someone who has personal experience installing glass mosaic tiles. Although the thinset you used is a non-sag product, the fact that it hasn't set up concerns me.

So sorry I couldn't help you with the perfect answer. Wishing you good luck -- and years of enjoyment from your beautiful glass backsplash!


Diane Plesset, CMKBD, NCIDQ, C.A.P.S.
D. P. Design  

Kitchen Design/Remodeling

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Diane Plesset


I will answer questions about kitchen design, remodeling: appliances, cabinets, countertops, lighting/switching, accessible kitchens, kitchens for multiple cooks, kitchen trends, flooring, windows and doors, ventilation, safety, function, and style.


25+ years as a kitchen designer; over 10 years as a Certified Master Kitchen-Bath Designer. Hundreds of projects completed, in all styles, all ranges of investment. Multiple design awards and published articles (see below). Public speaker and lecturer about home remodeling. Co-host of a local radio program for over three years, currently the host of "Today's Home" on Lifetime WebRadio every Sunday afternoon (website:

NKBA (National Kitchen and Bath Association); NAHB (National Association of Home Builders); PRO (Portland Remodelers' Organization); IDPC (Interior Design Protection Council)

"THE Survival Guide: Home Remodeling" (book published in 2003), Gentry Magazine, Designers' Illustrated Magazine, Interior Coordinator Magazine (Japan); San Jose Mercury News, San Mateo Times, San Francisco Chronicle, Oregonian, Statesman Journal Newspapers.

Multiple degrees, including bathroom design, kitchen design, lighting design, and residential interior design. Classes and seminars attended frequently, to maintain current knowledge about products, trends, codes, and technology.

Awards and Honors
Multiple certifications: Certified Master Kitchen-Bath Designer (NKBA), Certified Interior Designer (NCIDQ, National Council of Interior Design Qualification), and Certified Aging-In-Place Specialist (NAHB). Awards include: Henry Adams Designer of the Year, CoTY, Master Design, Chrysalis, Best of the Best, Excellence (Best home in its category), and NABE (Best how-to book, 2003).

Past/Present Clients
To see photos of completed projects, please visit my website:

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