Following the passing of our good friend and mentor Heinz Jahn, Cathedral Stone Products, Inc. in the USA purchased and maintains the sole ownership rights to the Jahn products and intellectual property.

Therefore, for any enquiries relating to the Jahn M and Jahn S ranges, please visit Cathedral Stone

Jahn M35 Injection Mortar is a mineral-based, single-component mortar that is supplied ready to mix with water. Containing no acrylic or latex bonding agents or additives, M35 is of pure origin, vapour permeable and free from any toxic substances.

M35 is an adjusted mortar for sealing constructional cracks ranging from 3 mm to 10 mm. It may be used in both non-structural and load bearing situations. M35 is finer and heavier than M40.

Sealing constructional cracks from 3mm to 10mm in brick, natural stone and concrete.

  • Engineered in the lab, proven in the field
  • Single component mixes with water only
  • Highly moisture, frost and salt resistant and salt and moisture regulating
  • Vapour permeable – prevents failure due to salt expansion or freeze/thaw cycles.
  • Non-shrinking
  • Scientifically controlled – no on-site chemistry resulting in product variation
  • Can be manually or mechanically applied.
  • Strong adhesion
  • Water Based: Environmentally and user safe – no solvent clean up or disposal problems

Trade Enquiries

Please call to discuss your requirements. Discounts are available for bulk orders and for Steadfast Registered Installers.

Same Day Dispatch

If you order before 10am on any week day we will endeavour to dispatch your items on the same day via your chosen shipping option. Please note that this may not be possible for larger items.

Customer Support

We are here to help and advise you. Please call for support, email us with your enquiry or use the live chat facility.