Install Aluminum Door Threshold: DIY Draft Proofing

A drafty doorway not only compromises the comfort of your home but also leads to increased energy bills, making energy efficiency a key concern for homeowners nationwide. Frost King, a leading manufacturer of weatherproofing products, offers a range of solutions, including aluminum door thresholds designed for easy installation. With basic tools like a power drill and a few hours of your time, you can install aluminum door threshold to effectively seal gaps and block drafts. DIY projects, such as this one, provide a cost-effective way to enhance your home's insulation and reduce your carbon footprint, promoting sustainability and saving money.

Enhancing Your Home with a New Aluminum Door Threshold

Embarking on home improvement projects can feel daunting, but some upgrades offer immediate and tangible benefits. Replacing or installing an aluminum door threshold falls squarely into this category, transforming your entryway into a more energy-efficient and weather-resistant barrier.

This guide serves as your comprehensive roadmap, empowering you to tackle this project with confidence and achieve professional-quality results. We'll walk through each step, ensuring a smooth and successful installation.

Understanding the Threshold's Vital Role

At its core, a door threshold serves as the critical transition point between the interior and exterior of your home. It's far more than just a decorative element; it's a functional component designed to seal the gap under your door.

This seal prevents drafts, keeps out unwanted moisture, and acts as a barrier against pests. A well-maintained threshold is essential for maintaining a comfortable and energy-efficient living space.

Reap the Rewards: Energy Savings and Weather Protection

Investing in a new aluminum door threshold translates into significant advantages for your home and your wallet. The most immediate benefit is improved energy efficiency. By effectively sealing gaps, you minimize air leakage, reducing the strain on your heating and cooling systems. This directly translates into lower energy bills.

Beyond energy savings, a properly installed threshold provides robust weather protection. It acts as a barrier against rain, snow, and wind, preventing water damage and maintaining a comfortable indoor climate. No more worrying about water seeping in during storms!

Moreover, a new threshold enhances your home's curb appeal and provides a renewed sense of security.

A Glimpse at the Toolkit

While we'll delve into specifics later, it's helpful to have a preliminary understanding of the necessary tools and materials. You'll need a new aluminum door threshold (of course!), exterior-grade caulk, wood shims for leveling, a screwdriver, measuring tape, a cutting tool (like a hacksaw), and essential safety gear such as safety glasses and gloves.

Don't worry; each item will be discussed in detail, ensuring you're fully prepared before you begin.

Understanding the Importance of a Properly Installed Threshold

Before diving into the practical steps of installation, it's crucial to understand why a properly installed threshold matters. It's more than just a cosmetic upgrade; it's a key element in your home's overall energy efficiency and comfort. A poorly installed or damaged threshold can negate the benefits of even the most energy-efficient doors and windows.

Draft Proofing: Creating an Airtight Seal

The primary function of a door threshold is to create a tight seal between the bottom of the door and the floor. This seal is the first line of defense against drafts, preventing cold air from entering in the winter and hot air from seeping in during the summer.

Gaps, even small ones, can act as superhighways for air leakage. This leads to uncomfortable temperature fluctuations inside your home and forces your HVAC system to work harder to maintain a consistent temperature.

Think of it like this: a properly installed threshold is like a gasket, preventing air from escaping or entering.

Insulation and Energy Savings

Beyond draft proofing, a well-installed threshold contributes significantly to your home's overall insulation. Insulation works by slowing the transfer of heat. A leaky threshold compromises this insulation, allowing heat to escape more easily.

By minimizing air leakage, you reduce the workload on your furnace and air conditioner, leading to lower energy bills. A small investment in a new threshold can yield substantial savings over time.

Moreover, reduced energy consumption translates to a smaller carbon footprint, making your home more environmentally friendly.

Sealing: The Key to Threshold Performance

The concept of "sealing" is central to understanding threshold installation. A seal is any method used to block airflow.

In the context of a door threshold, sealing involves a combination of precise fitting, leveling, and the strategic application of caulk. Gaps or imperfections in any of these areas can compromise the seal.

Proper sealing not only prevents drafts but also protects against water damage and insect intrusion.

Therefore, attention to detail during installation is paramount. Taking the time to properly seal your new threshold will pay dividends in terms of comfort, energy savings, and long-term home maintenance.

Gathering Your Materials and Tools: Setting Yourself Up for Success

Before you even think about touching a screwdriver, taking the time to assemble the right materials and tools is an absolutely crucial step. It can easily be the difference between a smooth, satisfying project and a frustrating, time-consuming ordeal.

Think of it as prepping your kitchen before cooking a gourmet meal: having everything within reach will dramatically improve the outcome.

Here's a comprehensive breakdown of what you'll need:

Essential Materials

Aluminum Door Threshold

First and foremost, you'll need the new threshold itself. Aluminum thresholds come in various styles and sizes.

Consider options like:

• Standard Thresholds: Basic, flat thresholds.
• Adjustable Thresholds: Designed with adjustable components to fine-tune the seal.
• Thermal Break Thresholds: Include a non-metallic thermal break to reduce heat transfer.

Choose a threshold that matches your existing door frame and the level of weather protection you desire. Measure the width of your doorway precisely before purchasing to ensure a proper fit.

Caulk (Exterior Grade)

Choosing the correct caulk is vital for creating a weather-tight seal.

Opt for a high-quality exterior-grade caulk that's specifically formulated for use with aluminum.

Look for labels that indicate:

• 100% Silicone: Provides excellent flexibility and water resistance.
• Paintable: Allows you to match the caulk to your door frame color.
• Aluminum Compatibility: Ensures it won't corrode the aluminum.

Polyurethane caulk is another durable option, but always confirm compatibility with aluminum to prevent potential issues.

Wood Shims

Wood shims are thin, tapered pieces of wood used for leveling. They're essential for ensuring your new threshold sits perfectly flush, even if your floor is slightly uneven.

Purchase a pack of assorted shims in varying thicknesses to give yourself flexibility. Cedar shims are a good choice because they are naturally resistant to rot and insects.

Cleaning Supplies

Before installing your new threshold, you'll want to ensure the area is clean of any debris.

Gather:

• Mineral Spirits: For removing old adhesive or caulk residue.
• All-Purpose Cleaner: To remove dirt and grime.
• Rags/Paper Towels: For wiping surfaces clean.

A clean surface will promote proper adhesion for the caulk and ensure a long-lasting installation.

Essential Tools

Screwdriver Set

You'll need both Phillips-head and flat-head screwdrivers in various sizes. A magnetic screwdriver will be a lifesaver for handling small screws in tight spaces.

Measuring Tape and Ruler

Accuracy is key! A reliable measuring tape and ruler are essential for measuring the doorway, threshold, and shims.

Pencil or Marker

Use a pencil or marker to mark measurements and screw hole locations on the threshold and door frame.

Cutting Tool

Depending on the type of threshold you purchase, you may need to cut it to size. Options include:

• Hacksaw: A good choice for smaller aluminum pieces and intricate cuts.
• Metal Cutting Saw (Chop Saw): Makes quick, clean cuts on larger pieces.
• Angle Grinder with a Cutting Disc: A powerful option for cutting thicker aluminum.

Caulk Gun

A standard caulk gun is necessary for applying the caulk sealant. Invest in a good-quality caulk gun for smooth, consistent application.

Hammer or Mallet

A hammer or, preferably, a rubber mallet will be useful for gently tapping shims into place without damaging them or the threshold.

Utility Knife

A utility knife with sharp blades is essential for scoring old caulk, trimming shims, and other small cutting tasks.

Putty Knife or Scraper

You'll need a putty knife or scraper for removing old caulk, adhesive, and debris from the doorway. Different sizes can be useful for various tasks.

Drill

A cordless or corded drill is required for pre-drilling pilot holes and driving screws.

Drill Bits

Have a selection of drill bits on hand, including:

• Pilot Hole Bits: Smaller bits for creating pilot holes for screws.
• Drill Bits Matching Screw Size: For creating holes for the screws to fit into.

Safety Gear

Your safety is paramount. Don't skip these essential safety items.

Safety Glasses or Goggles

Protect your eyes from flying debris when cutting, drilling, or scraping. ANSI-rated safety glasses or goggles are a must.

Work Gloves

Wear work gloves to protect your hands from sharp edges, splinters, and chemicals. Gloves also provide a better grip on tools and materials.

With the proper materials and tools assembled, you're well on your way to a successful aluminum door threshold installation. Take the time to gather everything beforehand, and you'll be amazed at how smoothly the project progresses.

Assessing the Existing Threshold and Doorway: Identifying Potential Issues

Gathering Your Materials and Tools: Setting Yourself Up for Success Before you even think about touching a screwdriver, taking the time to assemble the right materials and tools is an absolutely crucial step. It can easily be the difference between a smooth, satisfying project and a frustrating, time-consuming ordeal. Think of it as prepping your kitchen before attempting a complex recipe - having everything ready significantly boosts your chances of success.

Before diving headfirst into installing a new aluminum door threshold, a meticulous assessment of the existing conditions is paramount. This isn't just about aesthetics; it's about ensuring a proper fit, optimal performance, and long-lasting results.

Skipping this crucial step can lead to a host of problems down the line, including drafts, water damage, and premature wear and tear.

Inspecting the Existing Threshold: Uncovering Hidden Problems

Your first task is to thoroughly examine the existing threshold. Look beyond the surface. Are there visible cracks, splinters, or signs of decay?

• Common Culprits: Pay close attention to areas where the threshold meets the door frame and the flooring. These are prime locations for damage due to weathering and foot traffic.

• Identifying Wear: Notice any crumbling or deterioration of the material. This often indicates that the threshold has reached the end of its lifespan. Replacing it now can prevent more extensive problems later.

• Addressing Gaps: Check for gaps between the threshold and the door, or the threshold and the floor. These gaps are notorious for letting in drafts, moisture, and even pests. Run your hand along these areas to feel for any air leaks. Gaps are a clear indication that your threshold is no longer providing a proper seal.

Measuring the Doorway: Precision is Key

Accurate measurements are essential for ensuring that your new threshold fits perfectly. A threshold that is too short or too long will compromise its ability to seal properly.

• Width is King: Measure the width of the doorway opening from the inside of one door jamb to the inside of the other. Use a reliable measuring tape for accuracy. Double-check your measurements to avoid costly mistakes.

• Taking Multiple Measurements: It's wise to take measurements at the top, middle, and bottom of the doorway, especially in older homes where settling may have occurred. Use the smallest width from these measurements to account for any irregularities.

• Documenting Results: Write down all your measurements clearly. It is easy to forget if you're working with a lot of different measurements.

Assessing Floor Unevenness: Leveling the Playing Field

Uneven flooring can wreak havoc on the performance of your new threshold, creating gaps and preventing a proper seal. Identifying and addressing unevenness is crucial for achieving a professional and effective installation.

• Visual Inspection: Start by visually inspecting the floor on either side of the threshold. Look for any obvious dips, humps, or sloping areas.

• Using a Level: Place a level across the doorway opening, resting it on the floor. If the bubble isn't centered, it indicates that the floor is uneven.

• Measuring the Gap: If you detect unevenness, measure the size of the gap between the level and the floor. This will help you determine the appropriate thickness of shims needed to level the threshold. Shims are thin pieces of wood used to fill in gaps and create a level surface.

• Considering the Severity: Minor unevenness can often be addressed with shims. However, significant unevenness may require more extensive floor leveling work before installing the threshold. In extreme cases, consult a professional.

By conducting a thorough assessment of the existing threshold and doorway, you'll be well-equipped to tackle the installation process with confidence, ensuring a durable, weather-tight, and energy-efficient result.

Removing the Old Threshold: Step-by-Step Instructions

Assessing the Existing Threshold and Doorway: Identifying Potential Issues Gathering Your Materials and Tools: Setting Yourself Up for Success Before you even think about installing that shiny new aluminum threshold, you'll need to bid farewell to the old one. This stage requires patience and a careful hand to avoid damaging the surrounding door frame. A systematic approach ensures a clean and efficient removal.

Preparing the Area: Laying the Groundwork

The initial prep work is vital. It's not just about getting the old threshold out; it's about preparing a clean canvas for the new one. Begin by addressing the seal between the threshold and the surrounding surfaces.

Scoring the Edges with Precision

Employ your utility knife to carefully score along the edges of the threshold where it meets the door frame and the floor. This crucial step severs any existing caulk or paint that might be stubbornly adhering the threshold to the structure.

Hold the blade at a slight angle and apply steady pressure. Multiple passes are often better than forcing it on the first attempt. This avoids splintering the wood or damaging the surrounding areas.

Removing Debris and Old Caulk

Next, grab your trusty putty knife or scraper. This is where you'll start to loosen and remove any loose debris, crumbling caulk, or old adhesive residue.

For particularly stubborn caulk, consider using a heat gun (with caution!) to soften it before scraping. Always work slowly and deliberately to prevent gouging the surrounding surfaces.

Removing the Threshold: A Gradual Approach

With the area prepped, it's time to tackle the actual removal of the threshold. Proceed with caution, as this step often involves some degree of force.

Unscrewing Visible Fasteners

The first step is to identify and remove any screws that are holding the threshold in place. Over time, the screw heads can become stripped, corroded, or painted over.

Before you begin, use a wire brush or small pick to clean out the screw heads. This will help the screwdriver to grip more securely. Apply firm, steady pressure while turning the screwdriver. Avoid stripping the screw heads, as this can make removal far more difficult.

If you encounter a screw that simply won't budge, try using a screw extractor or applying a penetrating oil. Let it sit for a few minutes before attempting to remove the screw again.

Prying Up the Old Threshold Gently

If screws aren't the only thing holding the threshold in place, it's time to gently pry it up. Insert your putty knife or scraper between the threshold and the subfloor, and gently tap it with a hammer or mallet.

Work your way along the length of the threshold, gradually loosening its grip. Avoid using excessive force, as this could damage the door frame or subfloor.

If the threshold is particularly stubborn, you may need to use a small pry bar. Be sure to protect the surrounding surfaces with a piece of wood to prevent damage.

Addressing Stubborn Thresholds: A Patient Approach

Sometimes, despite your best efforts, the threshold will remain stubbornly stuck. This is where patience and persistence come into play.

Continue working along the length of the threshold, alternating between prying and tapping. Avoid focusing on one area for too long, as this could cause damage.

If necessary, use a heat gun to soften any remaining adhesive. Always exercise caution when using heat, and avoid overheating the surrounding surfaces.

Cleaning the Surface: Preparing for the New

With the old threshold removed, you're left with a potentially messy surface. This is your chance to create a clean and level base for your new threshold.

Thorough Cleaning: A Pristine Foundation

Use a vacuum cleaner or broom to remove any loose debris, dust, or dirt. Then, use a damp cloth or sponge to wipe down the floor and door frame. For stubborn stains or adhesive residue, consider using a specialized cleaner.

Be sure to follow the manufacturer's instructions carefully. Allow the surface to dry completely before proceeding to the next step.

Removing Remaining Adhesive: A Smooth Finish

For any lingering adhesive residue, an adhesive remover is your best friend. Apply the remover according to the manufacturer's instructions.

Let it sit for the recommended amount of time before wiping it away with a clean cloth. You might need to repeat this process several times to remove all the adhesive.

Take pride in a perfectly prepped surface. It's the foundation for a successful and long-lasting installation.

[Removing the Old Threshold: Step-by-Step Instructions Assessing the Existing Threshold and Doorway: Identifying Potential Issues Gathering Your Materials and Tools: Setting Yourself Up for Success Before you even think about installing that shiny new aluminum threshold, you'll need to bid farewell to the old one. This stage requires patience and a...]

Preparing the New Threshold: Cutting and Fitting

With the old threshold gone and the doorway prepped, it's time to focus on the new arrival. Getting the size right is paramount. Precision here ensures a snug fit, which is essential for draft-proofing and weather protection. Rushing this step will almost certainly lead to problems later.

The Importance of Accurate Measurement

Accurate measurements are the cornerstone of any successful installation. Before you even think about making a cut, double, even triple-check the width of your doorway. Measure from the inside edge of one door jamb to the inside edge of the other. Use a reliable measuring tape for best results.

Record this measurement clearly, and don't round up or down just yet. Precision is key. A slight discrepancy here can throw off the entire project, leading to gaps or an ill-fitting threshold.

Cutting the Threshold to Size: Choose Your Weapon Wisely

If your new threshold is too long, it's time to break out the cutting tools. But which one is right for the job? The answer depends on the thickness of the aluminum and what you have available.

• Hacksaw: A reliable and affordable option, especially for thinner thresholds. Secure the threshold in a vise and use steady, even strokes.

• Metal Cutting Saw: Offers a cleaner and faster cut than a hacksaw, making it a good choice for thicker aluminum.

• Angle Grinder: A powerful tool that can quickly cut through aluminum. However, it requires experience and caution.

  Always use a cutting disc designed for aluminum, and wear appropriate safety gear.

No matter which tool you choose, safety is paramount. Always wear safety glasses or goggles to protect your eyes from flying debris. Work gloves are also recommended to protect your hands.

Cutting with Precision: Tips and Techniques

Cutting aluminum can be tricky. Here are a few tips to help you achieve a clean, accurate cut:

• Mark Your Cut Line: Use a marker or pencil to clearly mark the cut line on the threshold.

• Secure the Threshold: Clamp the threshold securely in a vise to prevent it from moving during cutting.

• Cut Slowly and Steadily: Let the tool do the work. Avoid forcing the cut, which can lead to jagged edges.

• Deburr the Edges: After cutting, use a file or deburring tool to remove any sharp edges.

The Test Fit: Ensuring a Perfect Match

Before you start securing the threshold, it's essential to perform a test fit. Place the threshold in the doorway and check for any gaps or interference.

Does it sit flush with the floor? Is there enough clearance for the door to swing freely? Are there any areas where the threshold is too tight or too loose?

Now is the time to make any necessary adjustments. Small adjustments can be made with a file or sandpaper. If the threshold is too long, trim it down incrementally until you achieve a perfect fit. Remember, it’s better to take your time and get it right.

Installing the New Threshold: Leveling, Securing, and Caulking

[[Removing the Old Threshold: Step-by-Step Instructions Assessing the Existing Threshold and Doorway: Identifying Potential Issues Gathering Your Materials and Tools: Setting Yourself Up for Success Before you even think about installing that shiny new aluminum threshold, you'll need to bid farewell to the old one. This stage requires patience and a methodical approach. With the old threshold gone, it's time to focus on achieving a professional-grade installation that maximizes energy efficiency and weather protection.

Leveling: The Foundation for Success

Leveling is paramount. Don't underestimate its importance. An unlevel threshold will not only look unsightly but will also compromise the seal, defeating the purpose of the entire project.

Identifying Low Spots: The first step is to identify any unevenness in the floor. A simple visual inspection can sometimes reveal obvious dips or slopes. However, for a more accurate assessment, use a level. Place the level across the doorway opening where the threshold will sit. Observe the bubble. If the bubble isn't perfectly centered, the floor is uneven. Mark the low spots with a pencil; this will guide your shim placement.

Strategic Shim Placement: Now it's time for shims. Wood shims are ideal because they can be easily cut and shaped. Slide the shims under the threshold, focusing on the areas you marked as low. The goal is to gradually raise the threshold until the level indicates a perfectly horizontal surface.

Fine-Tuning: Use a hammer or, preferably, a rubber mallet to gently tap the shims into place. Avoid excessive force, as this can split the shims or damage the surrounding floor. Continuously check the level as you tap the shims. Small adjustments can make a big difference. Once the threshold is perfectly level, you can score the shims with a utility knife where they extend past the threshold, then snap them off for a clean look.

Securing the Threshold: Creating a Lasting Hold

With a level threshold, the next step is to secure it permanently. Proper fastening ensures stability and prevents movement over time.

Precise Positioning and Marking: Position the threshold carefully, ensuring it's aligned correctly within the doorway. Take your time here. A slight misalignment can lead to problems later on. Once you're satisfied with the position, use a pencil or marker to mark the locations of the screw holes on the floor. If your threshold came with a template, now's the time to use it!

Predrilling Pilot Holes: Predrilling pilot holes is crucial, especially when working with hardwood or concrete subfloors. Pilot holes prevent the wood from splitting and make it easier to drive the screws straight. Select a drill bit that's slightly smaller than the diameter of the screws you'll be using. Drill the pilot holes at each of the marked locations, drilling deep enough to accommodate the length of the screws.

Fastening with Care: Now, carefully drive the screws into the pilot holes. Use the appropriate screwdriver (Phillips or flathead) for the screws you've chosen. Apply steady pressure and turn the screwdriver slowly. Resist the urge to over-tighten the screws, as this can strip the threads or damage the threshold. Stop when the screw head is flush with the surface of the threshold.

Testing for Stability: Once all the screws are in place, give the threshold a good wiggle. It should be rock-solid, with no movement whatsoever. If you detect any play, try tightening the screws slightly. If that doesn't work, you may need to use longer screws or add additional shims for support.

Caulking: Sealing the Deal

Caulking is the final step in creating a weathertight seal. A properly applied bead of caulk will prevent drafts, keep out moisture, and improve the overall energy efficiency of your home.

Loading the Caulk Gun: Before you begin, make sure you have exterior-grade caulk that's suitable for use with aluminum. Cut the tip of the caulk tube at a 45-degree angle, and puncture the inner seal with a nail or wire. Load the tube into the caulk gun, and practice applying a bead on a piece of cardboard to get a feel for the flow.

Applying a Consistent Bead: Apply a smooth, consistent bead of caulk along all the edges of the threshold where it meets the floor and the door frame. Hold the caulk gun at a 45-degree angle and move it slowly and steadily along the seam. Avoid stopping and starting, as this can create an uneven bead. Overlap the beginning and end of the bead slightly to ensure a continuous seal.

Smoothing and Finishing: Once you've applied the caulk, use your finger or a caulk-smoothing tool to create a smooth, professional finish. Dip your finger in water mixed with a drop of dish soap to prevent the caulk from sticking. Apply gentle pressure and run your finger along the bead to remove any excess caulk and create a clean, even surface. Wipe away any excess caulk with a damp cloth.

Final Touches: Cleaning Up and Testing the Seal

The installation is complete, but the job isn't quite finished. Those final touches are what elevate a good DIY project to a professional-grade result. Cleaning up properly, thoroughly testing the seal, and implementing a simple maintenance routine are essential to ensure your new aluminum door threshold performs optimally for years to come.

The Importance of a Clean Finish

A clean workspace isn't just aesthetically pleasing; it's a sign of a job well done. Leftover caulk residue and stray debris can detract from the appearance of your new threshold and even compromise its long-term performance. Taking a few extra minutes to clean up will make a significant difference.

Cleaning Up Excess Caulk and Debris

Removing excess caulk is best done before it fully cures. A damp cloth is usually sufficient for wiping away fresh caulk smears. For stubborn, partially cured caulk, a plastic putty knife or scraper will do the trick. Be gentle to avoid scratching the surrounding surfaces.

Ensure you also clear away any leftover metal shavings from cutting the threshold, small pieces of wood from the shims, or other construction debris. A shop vacuum or even a household vacuum with a hose attachment will be useful for this.

Responsible Material Disposal

Proper disposal is critical, especially for leftover caulk tubes and packaging materials. Check your local regulations for recycling guidelines. Many communities have programs for recycling plastic containers and metal items. Safely discard any sharp objects, such as used utility knife blades, in a puncture-proof container.

Testing the Seal: Ensuring Draft-Free Performance

The primary goal of a new door threshold is to create a tight, weather-resistant seal. Now is the time to put your work to the test.

Feeling for Drafts

Close the exterior door tightly and run your hand along the threshold, paying particular attention to the areas where the threshold meets the door frame and the floor. If you feel any drafts of cold air seeping through, that means there are still air leaks present.

Addressing Air Leaks: A Simple Solution

Small air leaks are common after installation. Fortunately, they are relatively easy to fix. Apply another bead of exterior-grade caulk along any areas where you detected a draft. Be sure to smooth the caulk with your finger or a caulk-smoothing tool for a neat, professional finish. Let the caulk fully cure, as directed by the manufacturer, and then test the seal again.

Establishing a Regular Maintenance Routine

A little preventative maintenance will significantly extend the life and performance of your new door threshold.

Routine Inspections

Make it a habit to inspect your threshold at least twice a year, ideally in the spring and fall. Look for any signs of wear and tear, such as loose screws, cracks in the caulk, or damage to the aluminum.

Re-caulking When Necessary

The caulk is your threshold's first line of defense against the elements. Over time, caulk can dry out, crack, or peel away, compromising the seal. When you notice any damage to the caulk, remove the old caulk with a utility knife or caulk removal tool. Then, clean the surface thoroughly and apply a fresh bead of caulk. This small investment of time and effort will keep your threshold working optimally for years to come.

So, there you have it! Installing an aluminum door threshold might seem a little intimidating at first, but with a few tools and a bit of patience, you can seriously boost your home's energy efficiency and say goodbye to those annoying drafts. Give it a try and see the difference an aluminum door threshold can make!