New services Alex GC can arrange through a partnership with specialists in the industry.
The short version. Through a partnership with specialists in the industry, Alex GC can now arrange two services for glass that is hard to get to: window cleaning in hard-to-access areas, and inspection and reapplication of silicone sealant in hard-to-reach areas.
Some glass cannot be reached from inside the building or from a ladder: a penthouse set back above a cornice, a curtain wall over a sidewalk, a skylight or glass roof, windows facing a light well or a neighboring roof. Owners and managers of buildings like these often ask us who can clean the glass, and who can look at the sealant, once our installation is finished.
Our partnership with experts in this field now lets us arrange both:
You deal with us. We arrange the visit with our partner, and we bring what we know about the glass, the frames and the sealant on your building.
Glass that is never cleaned does not only look bad. Dirt, bird droppings and the run-off from masonry and metal sit on the surface, and over the years mineral deposits can etch into the glass so that ordinary cleaning no longer removes them. Regular cleaning is the cheapest way to keep glass clear for its whole life.
The difficulty on many buildings is getting to the glass safely. That is specialist work, with its own equipment and training, and it is why we arrange it through a partner whose business is access. The video shows the kind of location we mean: a glazed penthouse above an older masonry facade, reached from above.
See also our glass cleaning services page.
Every window, storefront and curtain wall depends on a line of sealant between the frame and the building, and often between glass and frame. Silicone lasts a long time, but not forever. Sun, heat and cold, and the movement of the building work on it year after year. The usual signs of a joint at the end of its life are:
A failed joint lets water into the wall, where the damage is hidden until it is expensive. The joints most likely to be neglected are the ones nobody can reach, so nobody looks at them.
An inspection finds these joints before they leak. Where the sealant has failed, the old material is cut out, the joint is cleaned and prepared, and new silicone is applied. Laying new sealant over old, failed sealant does not last, which is why removal and preparation matter as much as the new bead. More on sealants on our silicone sealant and waterproofing pages.
The glass does not have to be ours. We can arrange these services for glazing installed by others.
See property maintenance services for the other maintenance work we do.
Yes. Through our partnership with access specialists we can arrange cleaning of glass in hard-to-access areas such as setback penthouses, curtain walls, skylights and windows over light wells.
Look for sealant that has pulled away from one side of the joint, cracks along the joint, hard or chalky sealant, gaps at corners, or water stains inside after wind-driven rain. An inspection confirms which joints have failed.
It should not be. New sealant over failed sealant does not bond well and does not last. The old material is cut out and the joint is cleaned and prepared before new silicone is applied.
No. We can arrange cleaning and sealant inspection for glazing installed by others.
The building address, photographs of the areas concerned, and whether you need cleaning, a sealant inspection, or both.
Glass Cleaning Services Property Maintenance Waterproofing Silicone Sealants Commercial Property Services All News
About this page. Written by Alex GC Inc. d/b/a Alex Glass Construction and reviewed before publication by Aleksandr Chernovolenko, Managing Partner, with our design and estimating lead and a field foreman. Our foremen hold the NYC DOB Site Safety Training supervisor card and our crews the 40-hour worker card; we are certified to fabricate, install and service Alutech and Everest aluminum systems. Facts are drawn from our own projects, manufacturer test data and the applicable codes; where we are giving an opinion, we say so. Last reviewed September 2026. Credentials
Send us the address and photographs of the areas concerned, and tell us whether you need cleaning, a sealant inspection, or both. We will review the access and price the visit.
