The Flexim Story

What is Flexim?

Flexim is a ready-to-use roof mortar for fastening ridge tiles and roofing tiles on tiled roofs. It has been successfully used for over 30 years in the repair, renovation and new construction markets.

Flexim is formulated using natural ingredients, and contains no toxic substances which are harmful to the environment. Indeed, the primary ingredient of Flexim is actually a plant material: linseed oil. In addition, Flexim is aesthetically pleasing once installed as it gives the ridge and roof hip a traditional look.

Flexim is packaged in lightweight, ready-to-use strips so that the job on your roof can be performed easily and incredibly quickly. The product is available in a choice of packaging sizes:- larger packs containing 10 strips and smaller packs containing 5 strips. There are also Flexim tools available that ensure a good and proper seal.

Flexim applications

Flexim is a versatile, multifunctional product that is used in all sorts of applications, from roof repair and renovation to new build construction. The most prevalent application is securing ridge tiles on the roof’s ridge and hip, but Flexim can be used in many other places on the roof, including.

  • Securing and supporting tiles in the valley gutter (airtight and watertight solution)
  • Securing and supporting tiles along roof windows (airtight and watertight solution)
  • Connection between the ridge tile and chimney (filling in holes and seams)
  • Sealing off cracks in lead flashing (preventing flashing from sagging)
  • Filling up the gaps / seams between sections of corrugated roofing (preventing draughts)

Why should I use Flexim?

Flexim offers numerous practical and performance benefits:

  1. Ready to use and simple to apply
  2. Lightweight – safe and easy to take with you onto the roof
  3. Time-saving application
  4. Instanly waterproof
  5. Multifunctional
  6. Suitable for application in a wide range of temperatures
  7. Available in various colours and can be painted over


Since the founding of Flexim International BV in 1985, many remarkable projects have been completed using Flexim roofing mortar. These range from church roofs, universities and listed buildings to the roofs of American theme parks. We are extremely proud of this and hope to share many more projects with you in the coming years.

Do you have a special project you’d like to share with us? Then please contact us! The best submissions will be posted on the website, with a chance to win free boxes of Flexim roofing mortar.