Roofing Resources2022-09-24T01:56:41-06:00


FlexRock Coatings
FlexRock Coatings

FlexRock Coatings™ Roof Coating Video Training Center

Please review all instructional information before starting any projects. In addition to our Video training please review our FAQ Section

Introduction to FlexRock Roof Coatings™

The FlexRock Coatings™ Beats all traditional coatings hands down on durability turnaround time and cost. The FlexRock system is engineered to give the best performance with its natural and unsurpassed adhesion and elastic qualities. All of this with a product that is eco friendly.

Watch this video to see what makes FlexRock Coatings™ so unique. It’s stronger than concrete and stronger than epoxy.

FlexRock Coatings™ are stronger than concrete. Check out this video to learn about the amazing strength of FlexRock Coatings™.

Mixing is Critical

The key to a successful project is a combination of prep and knowing how to work with the material.

Make sure you watch this video and learn the steps for proper mixing.

  1. FlexRock should be at room temperature when ready to use
  2. We recommend Part A be stored at room temperature. No less than 32°F (0°C).
  3. The Part A bucket should be stored upside down for ease of mixing when used. Turn bucket upside (minimum, at least one day) before use.
  4. We recommended Part B be stored at temperatures between 75° to 105°F (24° to 41°C).
  5. Products must be kept free of moisture. Keep the containers closed because the product absorbs moisture from the air over time. Moisture in the product causes it to produce CO2 gas which may cause pressure build-up inside a sealed container.

One FlexRock 5-Gal Kit Covers Aprox 150-250 Sq ft of flat smooth surfaces. We recommend a minimum of 32 mills of coverage. Sq. Ft/Kit 32 ml @ 250 ft.².

Flexible Rock Coating is super versatile it can be applied extra thick for added Roof Coating protection. By applying more than the minimum, you simply add more protection and extend the lifespan even further. This thicker system is perfect for filling cracks and imperfections. A chemical bond is formed between FlexRock and the roof, creating a waterproof casement.

*Coverage rates can vary depending on the type of roof substrate, surface condition and application technique.

  1. You will only have 30 to 40 minutes (See curing estimates chart) to apply your coating material (after Part A and Part B are mixed together) to coat your surfaces before the coating material starts to harden.
  2. In order to begin coating, the substrate must be dry which is generally not achievable without having the dew point temperature being at least 5°C or 10°F below the substrate temperature.

Learn How To Refurbish a Flat Roof

Watch an overview of the steps of a roof restoration. In this video we cover the basics.

For more detailed videos check below.

FlexRock Coatings

Application Lessons

Video Training


How to Pull Test

Learn how to do a pull test to make sure your substrate is compatible.


Prepping A Roof

Learn how to prepare a roof for a coating application.


How to Add Reinforcement

How to make this incredibly strong roof coating even stronger. In this video, we add reinforcement fabric. To make a waterproof roof encasement that is super tough..


How to Add a Thickening Agent

Need to have some extra thick product for some of those problem areas? Watch this video on how to make a waterproof mastic.


How to Waterproof Roof Pipes

Make sure to coat roofing pipes chimneys and other penetrations.

(click to download)

FlexRock Coatings

FlexRock Coatings™ Weekend DIY Project

Check out these select FlexRock Coatings™ DIY weekend projects. The transformations are amazing!

50 year old porch with serious concrete damage gets a makeover and then looks brand new!

Cracked and failing backyard patio comes to life with HempCoat™ makeover.

Watch how this 3 Car Garage DIY project was transformed in just a weekend!

Frequently Asked Questions

FlexRock Coatings
What is FlexRock Coatings Application Temperature Range?2022-01-23T06:00:24-07:00

FlexRock Coatings have a wide application temperature range. For cold-weather roofing applications, The temperature can be as low as 35°F.

Using FlexRock, even freezing weather won’t affect its application or adhesion. There is no limit to FlexRock’s recoat window; it will always rebond to itself.   At temperatures well below freezing, FlexRock Coatings cure completely. FlexRock Coatings typically takes 24-36 hours to cure fully – in below-freezing temperatures, the cure time will be a little longer.

When installing in cold temperatures.  It is important to keep the product warm before application.  Keep the product at room temperature before mixing. We Strongly Recommend the use of electric blankets to keep the product warm before mixing.

In hot temperatures. keep the product cool and at room temperature prior to mixing. Keep in the buckets out of direct sunlight or a tarp or insulated pad to help keep the material cool.


– 20 to – 40 F / – 30 to – 40

How to thicken FlexRock Roof Coatings™2021-11-04T08:10:54-06:00

THICKENING: When a thicker product is needed to fill cracks or build up, follow small batch instructions and use any of the pre-approved thick-eners to achieve the thickness desired. Thickeners include: hemp hurd, crushed walnut shells, fumed silica, crushed polyethylene, and powdered polystyrene.

Thickening agents can be purchased at local paint stores.

Watch this video on using a thickening agent.

Roofing conditions where FlexRock Coating™ should not be considered.2021-11-23T18:14:43-07:00

Not all roofs are candidates for refurbishing. Use Extreme Caution when doing any roof repair always use safety equipment. When in doubt consult a professional roofing contractor

1. Surfaces prone to pedestrian traffic, decks, and frequent traffic bearing. Unless using a topcoat such as a polyaspartic or adding an aggregate for slip resistance.

2. Surfaces that are not prepared, including but not limited to wet, dusty, oily, mildewed, heavily chalked, blistered, or otherwise structurally unsound surfaces.

3. Oil-bleeding and solvent-bleeding materials. The list includes, but is not limited to, some vulcanized rubber products, tapes, failed sealants, some caulking compounds, and asphaltic/mastic materials without appropriate preparation.

4. Surfaces where adhesion has not been verified by testing.

5. New EPDM may need a primer or surface prep.

Roof Surface Preparation2021-11-04T07:39:52-06:00

A thoroughly cleaned roof is critical for a long-lasting application.

1. The owner/installer must prepare the substrate for the roof by addressing all of the conditions outlined in this document. Examine substrates to receive new roofing. Please do not proceed with the FlexRock Coating installation until unsatisfactory conditions have been corrected appropriately.

2. Make sure the substrate is free of delamination and defects (holes & other openings, tears, cuts, and open or partially opened seams).

If the defects are larger than 1/8”, repair before coating application.

3. Clean, dry and clear surfaces must be used to apply coatings or repair, free from dust, grease, wax, or other incompatible substances to facilitate appropriate adhesion. If grease, oils or heavy contaminants are present on the roof surface, remove them with a mild detergent prior to final cleaning. The use of bleach mixed with water can be used to remove algae, fungi, or vegetation. Thoroughly rinse surface and allow to dry prior to coating.

4. Roof decks that are deteriorated or structurally unsound should be replaced.



Where should reinforcement polyester fabric be used?2021-11-04T07:35:19-06:00
  • Blisters/Splits: To repair large splits/blisters, use polyester Reinforcing fabric 1/16″ thick in three layers and spread 2″ to 4″ beyond the split/blister area.
  • Flashing details, penetrations, and curbs, FlexRock Coatings 1/8″ thick shall be applied over the substrate. The edges of the coatings shall be feathered for the water to flow over the flashing details.
  • Membrane Repair: Check the roof substrates carefully for defects (holes, openings). When repairing defects over 1/8″ wide, use polyester reinforcing fabric. Add a thick coating in a three-course fashion and spread to 2” to 4” beyond the repaired areas.
  • Curb Flashings: All curb flashings shall be dressed in at least a 2” wide x 1/8” thick of FlexRock Coatings
  • Curbed AC Units: All curb flashings shall be covered with at least a 2” wide x 1/8” The perimeter shall be FlexRock Coatings FX-100
  • Penetrations: FlexRock Coatings shall be applied around the base of the penetration, extending at least 4” onto the vertical and 4” onto the base. Use additional material if needed
  • Seams: All seams and areas around roof protrusions (vents, scuttle hatches, pitch pans, etc.) are to be treated with FlexRock Coatings FX-100 at 1/8” thickening agent such as crushed walnut shells may be used if needed to achieve a watertight reinforced seal.
  • Skylights All exposed skylight fasteners shall be covered with FlexRock Coatings FX-100 All curbed corners joints shall be covered FlexRock Coatings at least 2” wide x 1/8” thick.
  • Prior to applying FlexRock Coatings, inspect the preliminary work / flashing details for problem areas (e.g., gaps, cracks, fish mouths, air pockets, etc.).
What is the coverage rate for FlexRock Roof Coatings2021-11-04T07:52:51-06:00

Please see our coverage guide.   Click Here

FlexRock Coatings

What is the working time for FlexRock Coatings?2021-10-30T17:15:33-06:00

You will only have 30 to 40 minutes to apply your coating material (after Part A and Part B are mixed together) to the surfaces before the coating material starts to harden.

Can I put FlexRock over silicone?2021-10-30T17:14:09-06:00

No, remove any silicon based materials. *FlexRock Coatings will not adhere to silicone!

What are the storage recommendations for FlexRock Coatings Base?2021-01-26T18:25:14-07:00
  1. It is recommended that Part A be stored at room temperature. No less than 32°F (0°C).
  2. The Part A bucket should be stored upside down for ease of mixing when used. Turn bucket upside (minimum. one day) before use.
  3. Recommended Part B be stored at temperatures between 75° to 105°F (24° to 41°C).
  4. Products must be kept free of moisture. Keep the containers closed because the product absorbs moisture from the air over time. Moisture in the product causes it to produce CO2 gas which may cause pressure build-up inside a sealed container.
FlexRock Coatings


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