Sealing a Flat roof

How To Seal Your Flat or Low Slope Roof

Sealing a Flat roof

How To Seal Your Flat or Low Slope Roof

Time to Complete 48 hours
Difficulty Level Beginner
Products Needed 2-3
Build Your Flat Roof Kit

Ultimate flat roof protection

You have a leak or your roof is getting old and worn out which needs attention.  You know you need to do something but not sure where to start.

Take a breath, relax and know that you’re in the right place to learn about your options.

On this page you’ll learn about the different types of roofs, what are the most common problems and the steps to fix your roof.

There are videos, images, steps and application guides to show you the way.

5 Year Warranty

If your product fails, peels or cracks, we’ll replace your failed product.

5 Year Warranty
What is the 5 Year Warranty?
  1. You must restore your full roof.
  2. You have to follow the directions, use the recommended Liquid Rubber products and the required amount of Liquid Rubber products.  We’ve established the products to succeed with certain criteria.  See Application Guideline - CLICK HERE
  3. Register your order number and project details within 30 days of purchase by calling 1-855-592-1049 and speaking to Liquid Rubber Technical Support.
  4. If you have an issue, contact Liquid Rubber Technical Support within 30 days at 1-855-592-1049

You cannot transfer the warranty to another party.

The limited warranty only applies to the product and does not cover property damage, physical or economic loss.

  • Damage from natural forces, disasters and acts of God like hurricanes, tornadoes, hail, lightning, earthquake, insects, branches or animals.
  • If you do not follow directions and guidelines.
  • Structural defects that cause failure.
  • Using harmful chemicals on the products or cured membrane.
  • Physical damage to the membrane of any sort.
  • Altering the product in any way, unless instructed in writing by a Liquid Rubber Technical Specialist.

Real Customers sealing their Roofs

Huge Savings!
I wanted to find a way to do preventative maintenance on the flat portion of roof on my home and after talking to support, I was confident I could do this myself. I am pleased with the results and even happier with all the money I saved by doing it myself!
Jim JohnsonFlat / Low Slope Roofs
Easy to use
After building a new shed, I wanted to make sure it lasted for years to come. After seeing that Liquid Rubber Color Sealant is UV stable, and reflects heat to keep it cooler inside, I was sold! It's been years, and I am as happy as I was from day one.
Neil PedersenFlat / Low Slope Roofs
Huge Savings!
I wanted to find a way to do preventative maintenance on the flat portion of roof on my home and after talking to support, I was confident I could do this myself. I am pleased with the results and even happier with all the money I saved by doing it myself!
Jim JohnsonFlat / Low Slope Roofs
Easy to use
After building a new shed, I wanted to make sure it lasted for years to come. After seeing that Liquid Rubber Color Sealant is UV stable, and reflects heat to keep it cooler inside, I was sold! It's been years, and I am as happy as I was from day one.
Neil PedersenFlat / Low Slope Roofs
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Real Customers sealing their Roofs

Huge Savings!
I wanted to find a way to do preventative maintenance on the flat portion of roof on my home and after talking to support, I was confident I could do this myself. I am pleased with the results and even happier with all the money I saved by doing it myself!
Jim JohnsonFlat / Low Slope Roofs
Easy to use
After building a new shed, I wanted to make sure it lasted for years to come. After seeing that Liquid Rubber Color Sealant is UV stable, and reflects heat to keep it cooler inside, I was sold! It's been years, and I am as happy as I was from day one.
Neil PedersenFlat / Low Slope Roofs
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Build Your Flat/Low Slope Roof Kit

Choose your options and press calculate

What Roof Coating do you want?

Silicone Roof Coating - Premium coating where you can apply the final coverage in 1 coat. Comes in White. Average lifespan before recoating is 10 -15 years

Waterproof Sealant - Only comes in Black. Average lifespan before recoating is 5 - 10 years.

Color Sealant - Similar to the Waterproof Sealant but comes in different colors. Average lifespan before recoating is 5 - 10 years.

Silicone Roof Coating - Premium coating where you can apply the final coverage in 1 coat. Comes in White. Average lifespan before recoating is 10 -15 years

Waterproof Sealant - Only comes in Black. Average lifespan before recoating is 5 - 10 years.

Color Sealant - Similar to the Waterproof Sealant but comes in different colors. Average lifespan before recoating is 5 - 10 years.

Choose Roof Type

If you're unsure about the type of roof you have, please refer to the Flat & Low Slope Roofs Application Guideline.

If you're unsure about the type of roof you have, please refer to the Flat & Low Slope Roofs Application Guideline.

How many linear feet of seams, joints, vents do you need to bridge with Seam Tape or Geo-Textile?

Liquid Rubber Seam Tape and Geo-Textile reinforce seams, joints, vents… that are prone to leaking. 

Seam Tape - Peel and stick option, quick application and ready to be top coated.

Geo-Textile - Fabric embedded into the coating using the 3 course method. 

Feet

Liquid Rubber Seam Tape and Geo-Textile reinforce seams, joints, vents… that are prone to leaking. 

Seam Tape - Peel and stick option, quick application and ready to be top coated.

Geo-Textile - Fabric embedded into the coating using the 3 course method. 

How many linear feet of seams, joints, voids… between 1/8”- 1/2” do you need to fill with Sealant & Adhesive Caulking?

Liquid Rubber Sealant & Adhesive Caulking is used to fill voids larger than 1/8” - 1/2” (up to 1/2” deep) before being bridged with Seam Tape or Geo-Textile.

Feet

Liquid Rubber Sealant & Adhesive Caulking is used to fill voids larger than 1/8” - 1/2” (up to 1/2” deep) before being bridged with Seam Tape or Geo-Textile.

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Calculate Your Project Size
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Choose Products

Find your Roof products below and add to cart!

Silicone Roof Coating
Silicone Roof Coating
Premium roof coating that you can apply in 1 coat to achieve your final thickness.
RV Roof Smart Cleaner
RV Roof Smart Cleaner
Non-Toxic - Clean your roof without killing your grass or polluting the sewers.
 Promotes better adhesion of coatings.
EPDM & TPO Primer
EPDM & TPO Primer
Using the correct Primer promotes adhesion and extends the life of your roof coating. Click on "Change Primer" for more details.
Multipurpose Primer
Multipurpose Primer
Promotes better adhesion and reduces peeling and flaking.
Concrete Etch
Concrete Etch
Cleans and opens concrete pores to promote better adhesion. Easier to use than an acid etch product.
Seam Tape
Seam Tape
Used to bridge across larger areas and protect areas prone to leaking/movement.
 Excellent adhesion.
Geo-Textile
Geo-Textile
Reinforces seams, joints, vents. Embedded into the coating using the 3 course method. Similar to doing a drywall joint.
Sealant & Adhesive Caulk
Sealant & Adhesive Caulk
Can be used as an adhesive, sealant and crack filler. Will not shrink back when curing.
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Silicone Roof Coating

How To Seal a flat roof

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Essential Resources for Your Project

Project Steps

  1. Prepare your space and gather your materials

    Make sure your surface and substrate is clean and dry. Note: Do not coat over saturated roofs.

  2. Detail Work

    Bridge joints, seams, vents and skylights with Liquid Rubber Seam Tape.

  3. Masking

    Apply painter’s tape to avoid seepage to surfaces that are not being treated.

  4. Apply Coating

    Apply Waterproof Sealant or Color Sealant to entire roof. Product can be sprayed brushed or rolled. Apply the next heavy coat when the product is dry to the touch and nothing is wet underneath. Tacky is ok.

  5. Clean Up

    Remove tape and close container to secure leftover product. If spillage occurs, soak up as much material as possible with rags. Clean immediately with soap and water. If spill is dried, scrape off as much as possible with a razor or scraper. Use mineral spirits to weaken product and an appropriate tool such as a wire brush or grinder to mechanically remove. If splashed on the skin immediately wash thoroughly with fresh water. If the product has dried on the skin massage the area with medical grade mineral oil, baby oil or edible oil, then wash with soap and water. If irritation persists seek medical attention.

Roof Sealing Gallery

Restore your roof! See what our customers have done.
Gallery Slides
Flat Roof - Waterproof Sealant
Shed Roof - Color Sealant (White)
Flat Roof - Waterproof Sealant
Flat Roof with Silicone Roof Coating
Red Barn - White Silicone Roof Coating

Questions about Sealing a Flat Roof

  • Primer is not commonly needed for these types of roofs.

  • Yes, you must remove all loose, flaking paint and then rough sand the well adhered paint before cleaning.

  • You can use a brush or 10mm (3/8") nap roller or push broom.

    It is also possible to be sprayed with airless, heavy industrial spray units capable of spraying a bitumen coating (e.g. Graco GH833), however, most homeowners will not have access to this equipment. 

  • US - Delivered in 3-5 business days
    CAN - Delivered in 3-7 business days
    UK - Delivered in 2-3 business days

  • By signing up and creating an account HERE, you will receive 10% off your first purchase. You will need to check your email and verify it by clicking the link.

Need some help?

Our team of experts are standing by to help make sure your project is a success. 

Why Liquid Rubber?
  • Over 1 Million Gallons Sold
  • 5 Year Warranty
  • Free Returns
  • Free Shipping Over $49.95