How To Use A Jamb Saw? (A Beginner Guide)

A jamb saw is an essential piece of equipment for precise and effective flooring installations. Jamb saws are designed specifically for this purpose, making it much easier to cut through wood in quick order without requiring any special skills or tools.

This strong saw enables smooth transitions between various surfaces because it was specifically made for cutting door jambs and trim to make room for flooring material. 

Whether you’re a DIY enthusiast or a professional builder, perfecting the use of a jamb saw is crucial for obtaining a smooth and expert finish.

In this article, we’ll show you how to use a jamb saw successfully and safely, step by step. 

You’ll learn helpful tips that will make your flooring tasks a breeze and also get the idea of using jump saw benefits and limitations. So let’s get started and maximize this tool’s versatility to bring your flooring installations to a whole new level.

How to Use A Jamb Saw

What is a Jamb Saw

A jamb saw is used to cut through a door frame vertically, horizontally or on an angle. This tool has two blades that rotate in opposite directions so it can be adjusted during cutting for the exact opening size desired.

Types of Jamb Saw

There are two types of jamb saws: the undercut and the regular. The difference between them is that an undercutting saw has a special blade with a tooth configuration which allows it to cut on both sides of the kerf.

What A Jamb Saw Used For?

A Jamb saw, also known as a door jamb saw or undercut saw, is a specialized power tool used in carpentry and flooring installation. Its primary purpose is to make precise cuts at the bottom of door jambs and casings so that flooring materials like laminate, hardwood, or tile can fit neatly underneath them. This process is called “undercutting.”

The main features of a jamb saw include a small circular blade mounted on an adjustable height base. The blade is usually carbide-tipped for durability and cutting efficiency.

The height adjustment allows the user to set the depth of the cut according to the thickness of the flooring material, ensuring a flush fit between the floor and the jamb.

When installing flooring materials, it’s essential to have a small gap between the edge of the flooring and the vertical surface of the jamb.

This gap allows for expansion and contraction of the floor due to changes in temperature and humidity, preventing buckling or warping of the flooring over time. The jamb saw helps create this gap precisely and cleanly.

To use a jamb saw, the user positions the tool next to the door jamb or casing and lowers the blade to the desired depth.

They then carefully push the saw along the edge, making a clean, straight cut without damaging the jamb or surrounding surfaces. This process is typically repeated at each door frame where the flooring material needs to fit.

Overall, a jamb saw is a valuable tool for professional flooring installers and carpenters, as it ensures a neat and professional finish when laying flooring materials around doorways, without the need for additional trim pieces or unsightly gaps.

How To Use A Jamb Saw? 

Here is the process of using jamb saw,

Step 1: Safety First

Prioritize safety at the top of your list before beginning your flooring job. Put on the appropriate safety gear, such as work gloves, ear protection, and protective goggles. You’ll be able to concentrate on the task at hand with confidence if your safety is ensured.

Step 2: Measure and Mark the Cutting Line

For exact cutting, accurate measurements are essential. Start by measuring the needed cutting area on the door jamb or trim. Once you have the measurements, mark the cutting line using a pencil or piece of chalk.

Verify your measurements a second time to prevent costly errors and guarantee a precise match for your flooring material.

Step 3: Adjust the Blade Depth

To avoid overcuts and guarantee a precise, clean cut, the blade depth adjustment must be done correctly.

Adapt the blade depth on the jamb saw to the thickness of the flooring material. The majority of jamb saws have a lever or knob for quickly adjusting the blade depth.

Step 4: Make the Cut

It’s time to cut after putting on your safety equipment and adjusting the blade depth of the jamb saw.

Holding the saw firmly, move it along the cutting line that has been indicated. To ensure accuracy throughout the cut, make slow, deliberate movements. For the greatest outcomes, take your time and don’t rush the procedure.

Step 5: Trim the Bottom for a Seamless Transition

Trimming the bottom of the door jamb or trim to match the height of the new flooring material is crucial for a seamless flooring changeover.

This step makes sure there are no gaps or uneven surfaces where the flooring slides beneath the door jamb or trim.

Step 6: Test the Fit

Test the fit of your flooring material against the cut door jamb or trim after making the cut and cutting the bottom.

Check that the flooring fits properly without any gaps or misalignments by setting it in place. To guarantee a great fit, make slight modifications as necessary.

Step 7: Repeat the Process

Repeat the previous processes for each door jamb and trim piece if your project calls for more than one.

The cutting process should be consistent to promote uniformity and a coordinated appearance throughout your flooring installation.

Step 8: Clean Up

Take some time to clear up any trash and dust that were left behind after finishing all the cuts.

Maintaining a tidy workspace can help you check the caliber of your job as well as keep the area safe.

Step 9: Maintain Your Jamb Saw

The appropriate maintenance of your jamb saw is essential to extending its lifespan and guaranteeing its continuing effectiveness.

Clean the saw, particularly the blade, after each usage to get rid of any accumulation that can impair its function. The jamb saw should be kept out of harm’s way and in a dry, secure location.

Benefits of Using Jamb Saw

A jamb saw is a specialty instrument used for cutting door jambs, baseboards, and other trim pieces at the floor level.

It is sometimes referred to as an undercut saw or flush-cut saw. It can produce precise cuts in confined spaces and close to the floor surface because of its tiny blade. Using a jamb saw has the following advantages:

1. Accurate and Precise Cuts

Making clean, accurate cuts along door jambs and baseboards: jamb saws are designed for precision cutting and allow you to make precise cuts along door jambs and baseboards.

This is particularly crucial when installing new flooring since clean cuts provide a flawless fit for a polished appearance.

2. Smooth Flooring Transition 

It’s crucial to have a seamless transition between flooring materials like hardwood, laminate, or tile and door jambs or baseboards when installing flooring materials like those.

Flush cuts can be made with jamb saws, allowing the flooring to glide beneath the trim for a tidy appearance.

3. Efficiency in Terms of Time and Labor

Jamb saws are effective equipment that can reduce the amount of time and labor required for flooring installation or trim work.

They can quickly cut door jambs, doing away with the need for time-consuming techniques like utilizing hand saws or chisels.

4. Versatility 

Jamb saws can be used for a variety of other activities in addition to the conventional chores of cutting baseboards and door jambs.

For instance, they are useful for numerous DIY projects because they can cut through thin materials like plywood or wooden boards.

5. Ease of Use

Jamb saws are comparatively simple to use, even for those with little background in carpentry or home renovation.

They are user-friendly because of their lightweight construction and flexibility, which makes cutting in small places easier.

6. Reduced Risk of Damage

Due to their bulkier designs or aggressive cutting actions, other instruments like circular saws or oscillating multi-tools pose a risk of injuring the floor or the trim while cutting door jambs.

Jamb saws have a more delicate blade, which lessens the possibility of unintended harm.

7. Cleaner Finish

Jamb saws’ fine-toothed blades provide cleaner cuts with little chipping or splintering.

This guarantees a polished appearance and minimizes the need for touch-ups or extra finishing work.

8. Cost-Effective Solution

If you routinely work on flooring or trim installs, purchasing a jamb saw may be a cost-effective choice.

It makes it unnecessary to engage experts to complete such duties and enables you to produce excellent results on your own.

Limitations of Using Jamb Saw

Although jamb saws are useful equipment for cutting door jambs and baseboards, users should be aware of several limits.

The following are some typical drawbacks of using jamb saws:

1. Limited Cutting Depth 

In comparison to other saws, such as circular saws or reciprocating saws, jamb saws have comparatively shallow cutting depths.

They may not be appropriate for cutting thicker materials or creating deeper cuts because they are specifically made for cutting flush to the floor surface.

2. Limited to Flush Cuts

Jamb saws are excellent at flush cutting, but they have few other cutting options.

They are not made to make the bevel or miter cuts required for installing certain types of trim or performing other carpentry chores.

3. Risk of Kickback

If the blade becomes stuck or tangled in the material when cutting near the floor, there is a chance of kickback.

Kickback can cause the instrument to jerk back in the direction of the user, which could result in mishaps or injuries.

4. Requires Room Under the Trim

For jamb saws to function properly, there needs to be enough room underneath door jambs or baseboards to fit the thickness of the blade.

Using a jamb saw might not be possible when the flooring or subfloor is higher than the trim.

5. Limited Versatility

Jamb saws are made specifically to cope with cutting baseboards and door jambs during flooring installations.

They might not be as adaptable as other saws that can cut at different angles and with different materials.

Safety Precautions for Using a Jamb Saw

Safety is of utmost importance when using any power tool, including a jamb saw. Here are some essential safety precautions to follow when operating a jamb saw:

Read the Manual: Before using the jamb saw, thoroughly read the manufacturer’s manual and familiarize yourself with the tool’s features, controls, and safety guidelines.

Personal Protective Equipment (PPE): Always wear appropriate personal protective equipment, including safety goggles or glasses, ear protection, a dust mask or respirator, and work gloves.

Safety glasses protect your eyes from debris, and ear protection reduces noise exposure. A dust mask prevents inhalation of airborne particles, and gloves protect your hands during the cutting process.

Secure Work Area: Ensure the work area is clean, well-lit, and free from clutter. Keep bystanders and pets away from the cutting area to avoid accidents.

Inspect the Saw: Before use, inspect the jamb saw for any damage or defects. Make sure the blade is sharp and properly attached. Do not use a damaged or faulty saw.

Power Source Safety: If using an electric or corded jamb saw, ensure the power cord is in good condition, and there are no exposed wires. For cordless saws, make sure the battery is charged and functioning correctly.

Secure the Material: Securely fasten the material you are cutting (e.g., door jamb or casing) to prevent slipping or movement during the cutting process.

Adjust Blade Height: Adjust the blade height to slightly less than the thickness of the flooring material to create a proper undercut without damaging the jamb.

Use Both Hands: Hold the jamb saw with both hands, maintaining a firm grip, and keep your fingers away from the blade.

Proper Cutting Technique: Position the jamb saw next to the door jamb or casing and start the cut with a steady and controlled motion. Avoid forcing the saw through the material; let the blade do the work.

Switch off and Unplug: After use, turn off the jamb saw, unplug it from the power source, and wait for the blade to come to a complete stop before setting it down.

Storage: Store the jamb saw in a safe and dry place, out of reach of children.

Maintenance: Regularly inspect and maintain the jamb saw according to the manufacturer’s guidelines. Keep the blade sharp and clean to ensure optimal performance and safety.


Can I cut hardwood flooring with a jamb saw?

Yes, jamb saws can efficiently cut laminate, hardwood flooring, and other thin materials. To avoid damaging the subfloor underneath, make sure the blade is made for hardwood and set the cutting depth.

What safety precautions should I take when using a jamb saw?

To shield yourself from noise and debris, use a dust mask, safety goggles, and ear protection. Avoid wearing loose clothing while working, and keep the area free of obstructions.

When changing blades or making adjustments, always unplug the instrument from the power supply.

Can I make bevel cuts with a jamb saw?

No, jamb saws cannot create bevel cuts; they are only intended for flush cutting. Use a separate saw or a dedicated miter saw for bevel or miter cuts.

How do I avoid kickback when using a jamb saw?

Keep a tight grip on the tool and make sure the blade is parallel to the cut line to reduce the chance of backlash.

Allow the saw’s steady cutting movement to perform the work rather than pushing it through the material.

How should I clean and maintain my jamb saw?

The saw should be unplugged after usage, and any dust or debris should be cleaned off. Check the blade frequently for wear or damage, and replace it if required.

To increase the jamb saw’s longevity, keep it in a dry, safe location.

How to use a jamb saw to cut door jambs?

The first thing to do is take the desired laminate and put it up against the door jamb, clearly marking where you want to cut.
Next adjust depth until correct for cutting out notch in doorway with hacksaw blade inserted into notches on cutter.

Then start cutting through one side of frame while applying firm pressure downward and away from workpiece as you go along don’t stop till clear passage has been achieved.

Finally, when working with door jambs and baseboards during flooring installs or trim work, learning how to operate a jamb saw properly is crucial for creating precise and flush cuts. Choose the proper blade for the jamb saw and modify the cutting depth as necessary.

Wear protective gear, keep the workspace clear, and observe other safety procedures. Place the saw flat on the floor and move it gradually along the trim for a flush cut.

Keep in mind that jamb saws may have restrictions when working with thicker materials and are not appropriate for bevel cuts. A jamb saw can be a useful instrument to improve the quality and effectiveness of your work if it is used and maintained properly.