What's In This Article
Carpet is one of the easiest and most economical floor coverings you can install. For many home and business owners, carpet balances affordability, ease of installation, and durability.
All that good stuff goes out the window when it’s time to rip the carpet up. Simply put, ripping up carpet can be a complete pain in the rear. After you’re finished, you usually have a ton of residual glue left behind on your concrete slab, which will cause problems during the installation of your new flooring.
Roll up your sleeves because today we will cover how to remove carpet glue from concrete so you can install new flooring and have it look great.
Tools and Materials
All carpet glues are heavy-duty adhesives that stand up to anything, including you, trying to scrape it off the floor. Some glues are more challenging to remove than others, so having a broad selection of tools and materials at your disposal is helpful. If one method isn’t working for you, you can experiment until you find a technique that works well.
If you don’t have every tool or equipment on this list, you should still be able to get the job done. The more of this stuff you have, the easier the job will be.
- Heavy-duty scraper or putty knife
- Heat gun or infrared heater
- Chemical adhesive remover or solvent (i.e., acetone or turpentine)
- Floor buffer or sander (optional)
- Safety goggles and gloves
- Dust mask or respirator
- Protective clothing
- Plastic sheeting or drop cloths
- Bucket and sponge or mop
- Stiff-bristled scrub brush
- Shop vac (best), vacuum (better), or broom and dust pan
- Concrete repair kit (if needed)
Preparing for the Job
Once you have all your tools and equipment ready, it’s time to begin the prep necessary to take care of the job.
The first thing you’ll want to do is dress for the job. Put on some clothing you don’t care about getting dirty and have a respirator mask and safety goggles handy for when you’re ready to begin.
Start by ripping the existing carpet if you haven’t already done so. The carpet and padding will want to stick to the floor, so pull them up as carefully as possible to try and limit the amount of old padding or carpet that’s still sticking to the surface.
Next, you’ll want to give the area a good cleaning. A shop vac is ideal, but a regular vacuum will do the trick, too. If you have neither, give the place a good sweep with a broom. Take a drop cloth or plastic sheeting and drape it over any nearby furniture or belongings.
Most Effective Removal Methods
We’ve compiled the most effective removal methods below in order of the least destructive to the most. Start with the first method, and move on to other methods only if you’re not succeeding with one of the less invasive options.
Scraping the glue off the floor is the easiest method for removing carpet glue from concrete, but it’s also the least effective. For most adhesives, a good scraping and some elbow grease are all you need to complete the project. With the more heavy-duty glues, you may need to move to a more aggressive method. Nevertheless, this is what we’ll start with.
A razor scraper designed for removing residual adhesives is the best tool to get the job done. A spackle knife will work in a pinch, but it’s small surface area and relatively lightweight build make it ineffective when dealing with carpet glues that are especially well-bonded to the concrete.
The most important part of the scraping process is the angle of your scraper blade. The ideal blade angle will differ from floor to floor, but as a rule of thumb, you’ll want to hold the scraper at a 15-30° angle to the concrete slab. This angle ensures you can remove as much material as possible without marring the concrete below.
Experiment until you’ve found the right angle, and move the scraper over the floor in a deliberate sweeping motion to remove as much glue as possible with each pass. After a few passes, it should be clear whether a simple scrape will be enough to get the job done. If you’re unhappy with your progress, move to the next, more aggressive method.
Heating & Scraping
Heating the glue to try and bring it back to its workable state is a tried-and-true trick that should make it easier for you to remove residual adhesive from the slab.
Start by turning on your heat gun or infrared heater, and work it across a small area of the floor, about 1-2” from the surface. Once the glue becomes tacky, use your scraper to take a pass at the floor and remove as much of the newly-softened adhesives as possible.
If this method proves effective, continue heating sections of glue and removing them with the scraper until you’ve thoroughly scraped the floor.
Solvent & Scraping
If heating and scraping weren’t working for you, the next method to try is using a solvent on the floor before scraping it. Plenty of products on the market are explicitly designed for removing carpet glue from concrete, and common solvents like acetone, turpentine, or paint thinner are also quite effective.
The first thing you’ll want to do is carefully read the manufacturer’s instructions and apply the solvent to the floor according to the specifications provided. Allow the solvent to penetrate the glue for some time before scraping the surface.
Once the solvent has penetrated the glue, scrape the floor to remove the residual glue and allow the floor to dry. Next, you’ll want to thoroughly clean the floor with a concrete cleaner or warm soapy water.
More Aggressive Methods
Sometimes, you fight the glue, and the glue wins. If you aren’t making solid progress using any of the abovementioned methods, you’ll need to consider even more aggressive approaches to get the job done.
Chances are, you don’t have a floor scraper or grinder at your disposal. The good news is most big box home improvement stores have them available for rent, and the cost of renting the equipment for the day is relatively inexpensive.
A walk-behind floor scraper can usually provide the extra “oomph” you need to power through even the most aggressive glues on the market. All you need to do is plug in the machine, ensure the blades are at a good angle, turn it on, and begin passing the machine over the floor to remove the excess glue.
If you’re successful using the scraping methods we’ve outlined above, you may notice that even after scraping, the floor is still tacky, or there are stubborn areas where the glue refuses to budge. In these instances, giving the floor a pass with a floor or hand grinder will provide the pristine finish you want before installing your new flooring.
If you only have a few small areas to contend with, a hand grinder or angle grinder with a diamond wheel will make quick work of the remaining glue. Meanwhile, if the entire floor is still covered in glue after you’ve tried every scraping method, a walk-behind floor grinder will handle the job much faster and more efficiently.
Before using any grinder or sander on a concrete floor, be aware that grinding concrete produces a tremendous amount of dust. Even if you’ve done a great job protecting the adjacent rooms with plastic, the dust will find a way to get into every nook and cranny imaginable.
If you’re going to grind the floor, you absolutely must hook the grinder up to a shop vac for dust collection. If you’re using a grinder that doesn’t allow for dust management, wetting the concrete will help significantly reduce airborne particulate matter.
To grind the floor, start by connecting your shop vac to the dust collection port on the grinder, and turn on the vacuum. Then, turn on the grinder and work your way across the floor in a back-and-forth motion until you’ve removed all the residual glue.
Safety is the most critical component you should always be mindful of when you’re embarking on any DIY project. Safety is paramount if you need to employ a floor scraper or grinder to get the job done.
Thankfully, working safely and smart isn’t rocket science. Start by making sure you’re dressed for the job. We’re talking boots, pants, gloves, and protective eyewear for starters. If you’re using a grinder, sander, or any other tool which kicks up lots of dust, wear a respirator or N95 mask to protect yourself.
Open windows if possible, or put a fan in the room to improve ventilation if no windows are available. When you’re using solvents or chemicals, follow the manufacturer’s instructions carefully and ensure you dispose of all your garbage and excess chemicals properly.
After you’ve finished removing all the residual glue from the floor, there are some steps you’ll want to take to ensure that the concrete is adequately prepped for the new flooring you’ll install over the slab.
The first thing you’ll want to do is give the floor a solid cleaning. Concrete cleaner works best, but if you’re looking to keep your budget as tight as possible, some warm soapy water will work fine.
Use a stiff bristled scrub brush to clean the concrete, and allow it to dry thoroughly. Once the concrete is dry, inspect it thoroughly for chips, cracks, or damage. While some minor imperfections in the slab can be left alone, any deeper chips or cracks should be addressed with a concrete repair kit before you install new flooring.
When it comes to how to remove carpet glue from concrete, there isn’t a lot to love about the process. Let’s face it; it’s labor-intensive gruntwork. Still, it’s one of the most important things you can do to prepare for a new flooring installation. Whether you’re installing plank, tile, or new carpeting, scraping the existing glue will ensure a flawless and professional installation.
Before you begin scraping the glue, set yourself up for success. Gather all the materials and tools you may need beforehand so you aren’t scrambling for stuff you need or running to the store to pick things up. If resurfacing is necessary, put up plenty of plastic to protect your belongings from dust, and always ensure you’re following proper safety protocols.
It might not be the most fun job in the world, but removing the old glue from your concrete slab will ensure your flooring project looks flawless when it’s complete.