Roof felt is a bitumen, asphalt, or tar-based sheet that is put between the rooftop deck and the shingles. It is a budget-friendly and convenient solution to give your roof waterproof protection.

These felts can be applied with an adhesive. So, if you want a roof that is both decorative and long-lasting, you may want to know how to apply roofing felt adhesive.

Roofing felt application is a simple task, but it does need undivided attention while doing it.

You don’t need to be concerned; simply follow the instructions and your job will be completed successfully. This article will provide you with all of the information you need to work on this project.

How To Apply Roofing Felt Adhesive: step by step guideline

Felt is a highly common roofing material used to cover and secure structures from excess moisture, snow, wind load, incests, and other external threats. Felt is a popular roofing item that is used to cover and protect structures from damp, snow, wind, rain, pests, and others. Roof felt is typically used as tiles or slates, but it is also widely used on flat roofs, shed roofs, and similarly garden buildings

Among the various types of roof felt, bitumen roof felt is the most commonly used. Before you begin, you should have a better understanding of the tools you will require.

Required tools:

  1. Claw Hammer
  2. Stanley Knife 
  3. 50mm Brush
  4. Tape Measure
  5. Flat Pry Bar
  6. Roof Nails
  7. Felt Adhesive
  8. Roofing Cap Sheet
  9. Roof Felt

Among various brands of felt adhesives, you can choose according to your preference and availability.

The following part will go over the technique in detail.

Step One:

Clean, scrape and dry the roof surface thoroughly before applying felt adhesive. Make sure there is no oil or grease of any kind. These can ruin the efficiency of the adhesive.

Use 50 mm stiff brushes to apply adhesive. The adhesive tends to thicken up in cold temperatures. So, they must be stored in a warm room.  The temperature should be kept between +3°C – +27°C.

Step Two :

Apply felt adhesive on the dry roof surface. Leave it for 15-30 minutes.  This time may vary based on the drying situation to develop the optimum thickness.

Step Three:

Place the felt on the adhesive after it has reached its optimum thickness. Make sure the felt sticks with the adhesive completely. Rub and roll whenever is needed; these will help to release any trapped air.

The felt must be rolled up to the adhesive and spread with something like a lightweight roller which weights around 15-25kg. Use the roller whenever it is required.

Step Four:

In order to join overlapping sections, they should be over 75mm for the sides, and for the end, it is 150mm. The felt adhesive can be placed underneath the roofing felt and well compressed to provide a thorough connection on the sides and the end as well.

Step Five:

For timber structure, The initial layer of felt must be fastened down with nails. Then, for the following layers, only using the adhesive may be required for bonding.

Step Six:

It may be necessary to prep the porous concrete surface before putting the adhesive. You can use primer for the preparation. This will increase the efficiency of the adhesive. Make sure the primer is totally dry before placing any roofing felt layer on the surface.

Step Seven:

Rest the felt for a minimum of twenty-four hours. After that check every side and end to confirm that full adhesive has been achieved.

Roof felts life span depends on how fully it is assembled. Properly installed roofing felt has a long life expectancy, ranging from 10 to 20 years.

A roof’s lifespan depends on how well managed and maintained it has been. Roof felt, on the other hand, is susceptible to damage and can degrade over time. Many felt roofs will need repairs from time to time, so you should check on your roof felt at least once a year.

How To Apply Roofing Felt Adhesive

Safety Tips:

  1. Roofs are slippery. You should be careful on the roof and wear some sturdy gym shoes that give some traction.
  2. Use a dust mask while using adhesive because breathing the adhesive directly might harm your health.
  3. Use gloves to protect your hands.
  4. Take safety precaution while trimming the roof felt  

Usage of The Roofing Felt:

Roof felt can be found as an underlayment beneath pitched roof shingles, it is also seen to be the primary roof covering for flat roofs, sheds, garages, and other outbuildings.

These felts can be applied either using a gas torch or adhesive applied cold. Using adhesive is safer because a gas torch can start a fire and they are not economical.

Advantages of Using Roofing Felt Adhesive:


Choosing adhesive to place a felt roof for your sheds is a lot cheaper compared to the other binding options. Not to mention, it is safer and easily available at any local store.

Easy to Install

Another advantage of felt adhesive is how straightforward it is to work with adhesive. Simply following the steps will help you to get your work done. For this reason, the adhesive is becoming more popular among DIYers.

Working Capacity

Using adhesive increases the lifespan of your roof and gives it a nice and smooth finish. The adhesive makes your roof aesthetically pleasing while also saving it from molds, moss, or any kind of leakage.


So, I think you have understood the process of how to apply roofing felt adhesive. Simply follow the steps of the guidelines and you will be done in no time. When scrubbing, be careful not to put excessive pressure on the roof; it can disrupt the arrangement of the shingles.

It is not advisable to use any methods that can potentially be hazardous. Make sure you don’t skip any of the steps. If you skip any stages, your roof will have problems later. Make sure you’re doing all of the necessary safety precautions.

Best of luck and keep yourself safe.


As a civil engineer and roofer, I love to share the experience that I have gained through the last couple of years. In the roofing industry, practical experience is a very crucial fact that can help you a lot. Hence, I want to help you with my blog.

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