Flexim Roof Mortar
Flexim is a ready-to-use, storm-resistant tile adhesive that stays permanently flexible. Since its U.S. debut in 1997, it’s become a trusted, high-performance alternative to traditional mortar.
Ready To Use Right Out Of The Box
Key Features
- Box Size: 20" x 18" x 4"
- Strip Size: 20" x 4" x 1"
- Weight Per Box 20 lbs
- Estimated Coverage: 15' to 20' of hip and ridge, both sides
- Shipping: Up to 15 boxes via UPS. More than 15 LTL
- Made in The Netherlands
- Flexim International BV Established 1985
Available Colors - $140 per box
Black
Dark Brown
Gray
Green ($10 Extra)
Light Brown \ Rust
Terra Cotta
We ship Flexim straight to your door from our warehouse via UPS—anywhere in the U.S. or Canada (sorry, we don’t ship to Florida).
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Some of the Benefits of Flexim Roof Mortar \ Putty
Save Time and Cut Costs
Flexim Roof Mortar is up to 5 times faster and 50% more cost-effective to install than traditional mortar. No mixing, no cleanup—just apply and go.
Instantly Waterproof
Flexim forms a waterproof seal immediately upon installation, standing up to heavy rain, wind, and extreme weather conditions.
Stays Flexible for Life
Unlike sand and cement mortar, Flexim remains permanently flexible, resisting cracking, shrinking, and damage from roof movement or wind uplift.
All-Season Application
Flexim works in a wide range of temperatures, from +140°F (+60°C) to -13°F (-25°C), making it ideal for year-round use.
Built-In Pest Protection
Flexim also helps seal out pests like rodents, birds, and bats. It hardens on the surface but stays soft inside, so it can re-seal itself if tampered with—perfect for pest control professionals needing a quick, reliable gap filler on the go.
Each box includes 10 ready-to-use sticks (20” x 4” x 1”)—enough for 15–20 feet of ridge or hip (both sides), or 30–40 feet on one side.
Ready to Use
Flexim Roof Mortar comes in pre-formed strips for fast, hassle-free installation. There’s no mixing required, and any unused material can be stored for future use.
Instantly Waterproof
Flexim provides immediate water resistance once applied. It’s built to handle extreme weather and temperature fluctuations without compromise.
Lightweight and Safe
Each Flexim strip is lightweight and easy to handle, reducing the risk of strain or injury during transport and installation. It’s designed to make roofing jobs faster and safer.
Eco-Friendly Formula
Made with natural linseed oil and free from harmful chemicals, Flexim is a responsible choice for sustainable construction and environmentally conscious projects.
Application Guidance
Flexim is ideal for sealing ridges, hips, and eaves. It is not recommended for valleys or areas with direct water runoff.
Manufacturer’s Warranty
Flexim Roof Mortar is warranted as a sealing and adhesive material when used as directed. Warranty coverage is limited to the purchase price of the product and applies only to installations on ceramic or concrete ridge and hip tiles, following the provided installation instructions
Project Photo Gallery
About Flexim International BV
Flexim International BV, based in Heerhugowaard, Netherlands, is the manufacturer of Flexim Roof Mortar — a trusted solution for roofing professionals since 1985. Flexim is used in maintenance, renovation, and new construction projects and is known for its long-lasting performance and environmentally friendly formulation. Made primarily with linseed oil, this ready-to-use mortar offers a sustainable alternative to traditional sand and cement. As of 2022, Flexim has been installed on over 4 million roofs worldwide. All production, packaging, and global shipping are handled with care at their Dutch headquarters.
Flexim Roof Mortar FAQ
Can Flexim really replace traditional mortar?
Yes — Flexim is designed as a direct replacement for sand and cement mortar. It’s faster, cleaner, and more durable over time.
How long does Flexim last once installed?
Flexim remains permanently flexible and weather-resistant. Unlike cement mortar, it won’t crack, shrink, or crumble — meaning fewer future repairs.
Is Flexim safe for wildlife and the environment?
Yes — Flexim is solvent-free and non-toxic. It’s safe for use around animals and is commonly used in humane pest exclusion work.
Can I install Flexim in cold or hot weather?
Absolutely. Flexim can be installed in temperatures from -13°F (-25°C) to +140°F (+60°C), making it perfect for year-round use.
How much coverage does one box provide?
Each box includes 10 sticks (20”x4”x1”) and will cover approximately 15–20 feet of hip or ridge (both sides), or 30–40 feet on one side.