National Cathedral, Washington, DC

The art of stone masonry meets the science of restoration and repair.

Cathedral Stone Products began restoring masonry the "right way" over 30 years ago when company founder, Dennis Rude, discovered JAHN Restoration Mortars in Europe. He’d gone there to search for a solution to the failures he’d seen working as a stone mason in and around Washington, D.C.

First developed in Holland by Mr. Heinz Jahn, these mortars were scientifically engineered to match the physical properties of the substrate in terms of elasticity, and porosity, as well as tensile and compressive strength. This ensures that whichever mortar is used, it will behave the same as the masonry being restored, eliminating one of the primary causes of failures.

In 1982, Rude brought JAHN Restoration Mortars to the United States and founded Cathedral Stone Products, Inc., which became the exclusive manufacturer of the Jahn Restoration Mortar systems in North America. Since then, the company has used its scientific approach to masonry restoration to develop and further refine a full spectrum of completely integrated and compatible masonry restoration systems that include:

• Masonry Restoration Grouts and Mortar Systems
• Masonry Cleaning & Stripping Systems
• Masonry Coatings & Repellents Systems

Today, thousands of top-tier architects, engineers, preservation specialists and historic building owners have trusted Cathedral Stone to help repair, restore, and preserve significant historic masonry structures across the country.