Glass Seal System
Protect your glass with DIAMOND SEAL SYSTEMS

This unique treatment is engineered to create a covalent bond at the molecular level, creating a smooth barrier on the glass to improve the water-repelling (super hydrophobic) properties.

Diamond Seal Systems protects the surface from water corrosion by keeping the last standing oxygen molecules in the glass surface coming in contact with hydrogen on the surface of the glass.  Diamond Seal creates a hydrophobic barrier.  Diamond Seal Systems products are tested by five independent labs in the U.S. as well as real life applications that are over 15 years old that proves Diamond Seal Systems is the industry leader in Super Hydrophobic Nana Technology coating systems.  The Diamond Seal Systems process also makes the glass brighter, optically clearer, and helps protect the glass surfaces.  In addition, it keeps glass “Green Clean” and hygienic making the surface “Forever Brilliant” The Diamond Seal Systems surface is warranted for 5 years with regular maintenance with NO harsh detergents, chemical cleaners or use of a squeegee and a limited life time with the Diamond Seal Systems recommended maintenance protocol.  Diamond Seal Systems guarantees against the coating from chipping, cracking, or yellowing.  The Diamond Seal Systems coating will not  make any adverse change in appearance, visual clarity, optical characteristics, or insulation seals of the coated surface. The surface will remain “Forever Brilliant” and easy to clean.

Each purchase of the Diamond Seal comes with a Lifetime Warranty, Diamond Blue Wash and Maintenance Instructions



We Are Not The Jack Of All Trades- We Are The Master Of One.

Alcosta Shower Door, Inc. has been family owned and operated for three generations. We set the standard with our union trained installers, including four MASTER GLAZIERS with over 25 years experience each. We have worked with the Bay Area's leading architects, contractors, glass dealers and homeowners for over 35 years.

Alcosta has an excellent rating with the contractors license board, An A-Plus with the Better Business Bureau, and a member of the San Ramon Chamber of Commerce.

Our company has built it's reputation by word of mouth. We predicate our business on service and workmanship. We offer a full year warranty, free in home estimates, reasonable rates on after warranty service calls and a great value for your money.

Residential or Commercial

We've got all your needs covered: from residential remodels, to commercial and everything in between. Don't hesitate to ask us a question or inquire as to why a certain process has to take place. All of our staff are friendly and knowledgeable because we know what it's like to be in your shoes. We want you to know just how special you and your project are to us, so we do our very best to ensure that you and your needs always come first. We even have a complimentary estimate where we'll come out to you! 

Our Promise

Our Services

Alcosta Shower Door Warranty

Alcosta Shower Door, Inc. Offers a full year warranty to the purchaser of any new shower door that is installed by ALCOSTA SHOWER DOOR, INC. Alcosta agrees to repair or replace any defective part at no charge to the purchaser within the warranty period. This warranty does not cover damage resulting from unusual wear and usage. Loss, alteration, accident, misuse or abuse, or lack of reasonable care in either installation or use of the products or parts. 

Alcosta Shower Door, Inc. assumes no responsibility for any special, incidental or consequential damages. Alcosta Shower Door, Inc. responsibility is solely limited to replacement of the material as stated. Alcosta Shower Door, Inc. reserves the right to decide if the defective part or product or repaired. Any and all claims for replacement and/or rework warranted merchandise must preapproved by Alcosta Shower Door, Inc.

Product Care & Maintenance

Your Alcosta Shower Door is a quality product that should last for years if properly maintained.
The glass in your unit can be kept clean with a non- abrasive cleaner. DO NOT use any caustic cleaners on your glass or aluminum. The aluminum on your shower unit is durable and resistant to water damage. Never use an abrasive of any kind as it will damage the finish. 

Alcosta carries a full line of cleaners for all your shower door needs. These cleaners, along with a soft, damp micro fiber cloth will keep your shower enclosure looking new.