Cutting carpet looks straightforward until you do it wrong. A dull blade through the face of a Berber loop. A straight-edge that slips two inches off-line right before a seam. Pile direction ignored across a double-cut join. These are the kinds of errors that announce themselves every single day for the life of the installation.
The cut is where professional installs separate from amateur ones. Every flooring contractor will tell you the same thing: measuring is forgiving, stretching is learnable, but a bad cut is permanent. Understanding the different ways to cut carpet — the tools, the direction, the technique per pile type — is what keeps seams invisible and edges clean.
This guide covers every major cutting method used in residential and commercial carpet work, from basic straight cuts to seam cutting technique per construction type, with the tool logic behind each decision.
Why Carpet Cutting Is More Technical Than It Looks
Carpet is not a single material. It is a fiber surface bonded to a woven or nonwoven backing, and sometimes a secondary foam or jute underlayer beneath that. The moment a blade engages carpet, it is working through multiple layers that each react differently to cutting force, blade angle, and speed.
The fiber type matters. Nylon and polyester cut cleanly with a sharp straight blade because the fibers sever without deforming. Wool is more resilient and resists compression, requiring slower, more deliberate blade passes. Loop pile constructions like Berber present the greatest challenge because cutting through a loop mid-strand causes the yarn to unravel outward from the cut line — a fraying process that does not stop unless the backing is sealed.
The backing matters just as much. Primary latex backings cut easily but can chip or crack if the blade is too dull. Action-back and cushion-back constructions are thicker and require more blade pressure while still needing controlled movement to avoid compression distortion. Jute-backed carpets cut cleanly but can shed backing fibers that contaminate seam adhesives.
Pile direction is the variable that most DIYers underestimate. Every carpet has a lean — a direction the face fibers naturally fall. When two pieces are joined at a seam with pile directions running opposite to each other, light hits them differently and the seam becomes permanently visible. Before any cut that will result in a joined piece, pile direction must be confirmed by running a hand across the surface and feeling which direction offers less resistance.
If you are comparing your flooring options and wondering whether carpet is the right choice for your space, the carpet flooring services overview covers the full scope of what installation actually involves.
The Tools That Define Each Cutting Method
Tool selection is not a matter of preference for aesthetics. It is a functional decision based on carpet type, cut length, and whether the cut is a straight edge, a seam, or a fitted shape around an obstacle. Using the wrong tool does not just produce a poor result — it can damage the carpet in ways that are not immediately visible but worsen under foot traffic.
Utility Knife / Carpet Knife
The utility knife is the most versatile tool in carpet cutting and the one most frequently misused. Its effectiveness is almost entirely a function of blade sharpness. A blade that is even slightly dull does not cut carpet — it crushes and drags fibers, producing a ragged edge that frays rapidly and creates a visibly rough seam or wall edge.
The correct technique with a utility knife is to make multiple shallow scoring passes rather than attempting to cut through the full depth in a single stroke. On a standard cut-pile carpet over a hard surface, two to three passes along a straight edge are typically enough to sever the backing completely. The first pass scores the surface and sets the line. Subsequent passes deepen the cut without the blade wandering.
Blades should be changed frequently — experienced installers swap blades every ten to fifteen feet of cutting on dense carpet. Carrying a blade disposal container on the job is standard practice. A blade that tugs or catches on backing threads has already become a liability.
Heavy-Duty Carpet Shears and Scissors
Shears are the tool of choice for trimming, detail work, and any cut where a blade would risk damaging an adjacent surface. They excel at cutting curved sections, trimming frayed edges after a knife cut, and finishing carpet around pipe collars or irregular obstacles where blade control becomes difficult.
Standard household scissors do not have the blade geometry or jaw strength to cut through carpet backing reliably. They stall on the woven primary backing and cause hand fatigue quickly. Heavy-duty carpet shears with serrated blades on at least one jaw are a different tool entirely, capable of sustained cutting through thick constructions without the repetitive motion stress of normal scissors.
For low-pile and loop carpets, shears are also used to finish seam edges after a row cut, trimming any remaining backing threads that might interfere with seam tape adhesion.
Loop Pile Cutter (Row Knife)
This is a specialized tool that most homeowners have never encountered, but it is the instrument professional installers use for every seam cut in Berber and other loop constructions. The loop pile cutter has a hooked or angled blade geometry designed to slide between rows of loops and cut the backing without severing the loop yarns themselves.
Using a standard utility knife on loop pile from the back risks cutting across multiple loop rows simultaneously, which creates a cut line that passes through yarn midpoints and triggers unraveling. The loop pile cutter eliminates this by allowing the blade to follow a row channel, keeping the cut contained between intact loop rows.
A row finder tool — essentially a dull awl or flat screwdriver — is used before the loop pile cutter to separate and identify the exact row channel to follow. This preparation step is not optional on Berber; it is what makes the difference between a seam that holds and one that progressively unravels from the cut edge inward.
Electric / Power Carpet Cutter
Power cutters are commercial tools that use a motorized oscillating or rotary blade to produce long, straight cuts without the manual pressure variation that causes line drift in hand-cutting. They are most useful in large rooms where cuts need to extend across the full width of a carpet roll, in commercial installations where multiple rooms need to be cut to plan simultaneously, and in any situation where cut-pile carpet needs to be trimmed to an exact length repeatedly.
The main advantage of a power cutter is consistency. Human blade pressure inevitably varies over a ten-foot cut, which means the blade can wander slightly even along a well-placed straight edge. A power cutter eliminates this variance. The tradeoff is cost, setup time, and the fact that motorized cutting generates significant fiber debris — protection of adjacent surfaces is required.
Seam Cutter / Wall Trimmer
A wall trimmer is a specialized tool with a guided blade that trims the carpet edge at a consistent distance from the wall or baseboard after the carpet has been stretched into position. It is used in the final stage of wall-to-wall installation to produce a neat, even edge that tucks cleanly under the baseboard or into the gripper rod gap.
Seam cutters are separate tools used specifically for preparing seam edges, removing the primary backing from the very edge of the carpet to create a clean surface for seam tape adhesion. These are not interchangeable with utility knives for seam work — the geometry of a dedicated seam cutter produces a more consistent backing removal that results in stronger seam bonding.
Method 1: Straight Cuts from the Back
For most carpet types in most situations, cutting from the back produces the cleanest result. The backing is a flat, uniform surface that accepts chalk lines and marker clearly. It does not obscure the cut line with pile. And because the blade cuts through the backing first, the fiber ends are left intact at the surface rather than being cut mid-strand.
The process starts by flipping the carpet face-down on a clean, firm surface. Measurements are transferred to the backing and a chalk line is snapped or a straight edge is used to draw the cut line. The chalk line method is preferred for long cuts because a hand-drawn line can drift over distance.
The blade is run along the marked line with a straight edge held firmly against it. On most residential cut-pile carpets, two to three passes with a sharp blade completes the cut. The key is not to rush the first pass — scoring cleanly sets the line and prevents the blade from wandering on subsequent passes.
After the cut, pull the two pieces apart slowly and inspect the edge. Any remaining connected fibers should be trimmed with shears. The finished edge should show a clean, consistent line with no fraying or tearing along the backing.
Back-cutting works well for cut-pile constructions including plush, saxony, and frieze. It does not work reliably for loop pile — Berber in particular — because the backing provides no visual reference for loop row alignment, which means the blade can cross rows rather than following them.
Method 2: Face Cutting for Loop Pile and Berber
Loop pile carpets — Berber being the most common — must be cut from the face. This is not a preference; it is a structural requirement of the construction type.
The loop pile in a Berber carpet consists of yarn that runs continuously through the backing in a series of U-shapes. Each loop is a single strand bent back through the backing. When a blade cuts across multiple loops at once, it severs both the upward and downward leg of each loop, leaving open strand ends that unravel progressively under any tension — including the tension created by foot traffic.
Face cutting with a row knife solves this by following the channel between loop rows. The row finder tool is passed along the carpet face to identify and widen the gap between two adjacent rows. The loop pile cutter is then slid along this channel, cutting only the backing material in the valley between rows while the loop legs on either side remain intact. The result is a seam edge where every loop terminus is anchored in backing rather than floating free.
For cut pile carpets that are already installed — and therefore cannot be flipped — face cutting is also required. The technique differs from loop pile. The pile is parted with fingers or a comb along the intended cut line to expose the backing below. The blade then runs along the exposed backing, cutting it cleanly while the parted fibers fall to either side. This produces a seam edge that is nearly invisible when the carpet is released because the fiber tips are never cut.
Understanding the structural difference between Berber and plush constructions is essential context here. If you want to understand what makes loop pile behave differently at the seam and under traffic, the comparison between loop pile and cut pile carpet covers the construction logic in detail.
Method 3: The Double-Cut Seam Technique
When two pieces of carpet need to be joined in the middle of a room — typically because the room is wider than the carpet roll — the quality of the seam is determined almost entirely by how the edges are cut and how well the pile direction is matched. The double-cut method is the professional standard for achieving invisible seams.
The two carpet pieces are laid out with their intended seam edges overlapping by approximately one inch. Pile direction is confirmed on both pieces — running a hand across both should feel identical in both directions of travel. If the pile leans differently on the two pieces, the seam will be visible regardless of how well it is taped.
A straight edge is placed along the planned seam line, and a single pass of a sharp knife cuts through both overlapping layers simultaneously. This produces two mirror-image edges that fit together with zero gap — because they were cut from the same line, any deviation in the blade path affects both edges identically and they still match.
After the double cut, the waste from both pieces is removed and the edges are inspected. Any backing threads that were not fully severed are trimmed with shears. For cut pile carpet, a seam sealer is applied along both cut edges immediately — a thin bead of latex seam sealer pressed into the backing locks fiber roots in place and prevents the gradual fraying that otherwise occurs at even well-made seams under heavy traffic.
For loop pile, the row-cut and trace-cut method replaces the double-cut. The first edge is row-cut with the loop pile cutter. That trimmed edge is then lapped over the factory edge of the adjoining piece by 25 to 35mm. A seam cutter is run along the first piece’s edge to trace-cut the second piece, ensuring the two cut lines align exactly. This combination produces a tighter, more consistent seam than trying to match two independently row-cut edges.
The mechanics of seam cutting in Berber require specific technique. For a full breakdown of the row-cut process on looped constructions, the guide on cutting seams on looped carpet goes into precise detail.
Method 4: Cutting Carpet for Stairs
Stair carpet presents a cutting problem that is fundamentally different from flat-field installation. Each tread and riser combination requires a piece of carpet cut to exact width and depth, with enough material to wrap under the nosing and into the riser channel — but not so much excess that the carpet bunches or creates a tripping hazard at the nosing edge.
Stairs are rarely uniform. The depth of each tread can vary by fractions of an inch, and the riser height changes between flights. Measuring each stair individually rather than assuming uniform dimensions is essential. A carpet piece cut to the average dimension will be tight on some stairs and loose on others.
The cutting method for stair carpet depends on whether a runner or individual pieces are being installed. For a continuous runner, the carpet is cut to width along its length, with the cut edges finishing under the edge trim or into the stringer channel. Cuts are made from the back with a straight edge and a sharp utility knife, working on a flat surface before installation begins.
For individual stair pieces, each piece is cut slightly oversized — typically two to three inches extra in both dimensions — and then trimmed to final size in place. A hooked blade knife gives better control on the nosing curve and the riser-to-tread transition angle than a standard blade. The final trim at the riser base is done with a wall trimmer or careful knife work guided against the riser face.
The pile direction on stair carpet should always run down the stairs — fibers leaning toward the nose of each tread. This aligns with the natural direction of foot traffic and reduces pile compaction at the nosing edge over time. Cutting pieces with the wrong pile orientation is a persistent DIY mistake that becomes obvious once the carpet is installed and lit from an angle.
Method 5: Cutting Around Obstacles and Door Frames
Cutting carpet to fit around door frames, columns, pipes, and built-in furniture is where patience replaces speed as the primary skill. Obstacles require a fundamentally different approach from straight-line work because the measurement system changes from a simple linear dimension to a spatial relationship between the carpet edge and a three-dimensional object.
The template method is the professional approach for any irregular shape. A piece of heavy paper or cardboard is placed against the obstacle and cut to conform to its exact profile. That template is transferred to the carpet backing, traced with chalk or marker, and the cut is made following the template outline. This eliminates the compounding errors that result from trying to transfer a complex measurement directly to the carpet.
For door frames specifically, the carpet is rolled up to the doorway and allowed to ride up the door jamb. The point where the carpet face meets the edge of the door stop molding is marked on both sides of the opening. A straight cut connecting those marks produces the doorway edge. The cut end is then tucked under the door jamb or finished with a transition strip.
For round obstacles like pipes, the technique changes. A slit is cut from the nearest carpet edge outward to the pipe location. At the pipe position, a small circle slightly smaller than the pipe diameter is cut. The carpet is fed around the pipe through the slit, and the edges close naturally when the carpet is stretched to its final position. The slit itself disappears under the pipe collar if the measurement is accurate.
Inside corners — where two walls meet and the carpet must fold into the corner — are handled with small relief cuts at the corner point. A single diagonal slice into the carpet at the corner vertex allows the carpet to fold flat against both walls without bunching. The exact angle and length of the relief cut is determined by carpet thickness; heavier constructions need a slightly longer relief cut to lie flat.
When carpet meets another flooring material at a doorway, the cut edge needs to be finished with a transition strip rather than left exposed. The type of strip depends on the height differential between the two surfaces. This is a cut-and-fit scenario where the carpet edge precision directly affects how cleanly the transition sits. The broader subject of transition strip selection is covered in the guide to different types of transition strips.
Method 6: Cutting Carpet Tiles
Carpet tiles are a modular format that requires a different approach to cutting than broadloom. Each tile is a rigid unit with a dimensional backing — typically PVC or bitumen — and a relatively shallow pile depth. The backing provides a stable surface for cutting that broadloom does not offer, and the smaller format means most cuts can be made on a flat work surface rather than on the subfloor.
Straight cuts on carpet tiles are made with a utility knife and a metal straight edge on the back of the tile. The tile is placed backing-up, the measurement is marked, and the knife is run along the straight edge in two to three passes. The PVC or bitumen backing cuts cleanly and holds the fiber layer in place during cutting, which means fraying is less of a concern with carpet tiles than with broadloom.
Border tiles — tiles that need to be cut to fit the gap between the last full tile and the wall — are measured using the overlap method. A full tile is placed on top of the last full tile in the row, aligned precisely. A second full tile is placed against the wall, overlapping the first. The edge of the wall tile marks the cut line on the border tile below it. This produces a cut piece that fills the border gap exactly, regardless of whether the wall is perfectly straight.
For curved cuts in carpet tiles — around columns, curved walls, or architectural features — a cardboard template is made first and transferred to the tile backing. The cut is made with a utility knife for the straight portions and heavy-duty shears or a rotary cutter for the curved sections. Small snips along a tight curve prevent the knife from binding and producing a jagged edge.
Method 7: Cutting Carpet for Patching and Repair
Patch cutting is technically demanding because the goal is not simply a clean cut — it is a cut that will become invisible against undamaged carpet. Two factors determine whether a patch is visible: pile direction match and pattern or texture alignment.
The damaged section is cut out in a clean geometric shape — a square or rectangle is easier to match than an irregular outline. The cut is made with a utility knife from the back, cutting only through the primary backing and not pressing into the subfloor or pad. The cut square is used as a template to cut the replacement piece from a remnant of the same carpet, taken from a low-visibility area like inside a closet if no extra material is available.
The replacement piece must be cut with its pile direction matched exactly to the surrounding carpet. This means the direction of lay in the replacement should match the surrounding field. If the patch is cut correctly but the pile runs perpendicular to the surrounding carpet, the patch will catch light differently and be instantly visible.
For loop pile repair — particularly Berber — the cut must follow loop rows on all four sides of the patch. Cutting across a loop row on any side of the patch will cause the edge to unravel outward from the repair over time. This is one of the most common reasons DIY Berber patches fail.
Once the patch is cut and tested for fit, the edges are sealed with latex seam sealer and the patch is secured from below with double-sided carpet tape or a patch adhesive disc. The seam sealer is applied to both the patch edges and the surrounding carpet edges before final placement. Weight is placed on the patch and left for the adhesive cure time before foot traffic is allowed.
Cutting Carpet for Removal: The Strip Method
When removing existing carpet for disposal or replacement, the cutting approach is different from installation work. The goal is no longer precision seaming — it is manageable piece sizes for rolling and carrying out of the space.
The standard method is to free a corner with pliers, pulling the carpet off the gripper rods. Once a corner is loose, the carpet is cut into strips across the room width — typically two to three feet wide — and each strip is rolled and taped for disposal. Cutting strips from the backing side is faster because you can see the blade path clearly and apply appropriate pressure without worrying about surface damage.
The carpet pad beneath is handled separately. It is stapled or glued to the subfloor, so it must be cut into strips and peeled away, with staples or adhesive residue cleaned from the subfloor before new flooring goes down. The subfloor condition revealed after carpet removal often determines what flooring is viable next — understanding the full lifecycle of carpet as a flooring material helps set appropriate expectations for what is underneath after years of installation.
Blade Management: The Variable Most Underestimated
Every technique described in this guide depends on blade sharpness. This is not a minor caveat — it is the central variable in carpet cutting quality. A dull blade does not make a bad cut in the way a dull chisel makes a rough mortise. It makes a fundamentally different type of damage: it compresses and drags fiber rather than severing it, leaving a cut edge that looks acceptable immediately but frays progressively under any stress.
Professional installers change blades far more frequently than most homeowners would expect — after every ten to fifteen linear feet of cutting on dense carpet, or immediately at the first sign of resistance. The blade cost is a fraction of the cost of a visible seam or a fraying edge that requires recutting. Carrying a full set of replacement blades for any carpet cutting project is non-negotiable.
Hook blades — designed for loop pile and Berber — have a different cutting geometry than standard straight blades. They are not interchangeable. Using a straight blade on loop pile when a hook blade is the appropriate tool creates the same problem as using a dull blade: the blade catches on loop strands rather than following between them, and fraying begins from the moment the cut is made.
Fraying Prevention: Seam Sealer and Edge Finishing
Every cut edge on a carpet — whether it is a seam, a wall edge, or a patch border — is a potential fraying site. The fiber roots that were cut are no longer held by the backing structure and will migrate outward from the cut line under any lateral stress.
Latex seam sealer is applied immediately after cutting to lock those fiber roots back into the backing. The application is a thin bead pressed into the backing along the cut edge — not applied to the fiber surface, where it would mat the pile. The sealer penetrates the backing and bonds the fiber roots to the latex matrix, preventing migration.
For cut edges that will be tucked under baseboards or into gripper gaps, seam sealer is still recommended even though the edge will not be visible. Fraying under a baseboard eventually works its way out to the visible face of the carpet, particularly on high-traffic edges near doorways.
For any exposed edge — a carpet used as an area rug, or a section that terminates in a visible border rather than being tucked — professional carpet binding is the correct finish. This involves a binding tape applied to the edge with a specialized binding machine that wraps the tape over the cut edge and heat-bonds it to both the backing and the face fibers. Binding produces a finished edge that is structurally similar to the factory selvage and will not fray under normal use.
Carpet Type vs. Cutting Method: A Reference Summary
The relationship between carpet construction and the correct cutting method is the core of this guide. To consolidate it:
Cut pile carpet (plush, saxony, frieze, velvet) is cut from the back for most straight work. Face cutting by parting the pile and cutting along the exposed backing is used when the carpet is already installed or when the piece cannot be flipped. Seam sealer is applied after every seam cut.
Loop pile carpet (Berber, loop Frieze, commercial loop) is always cut from the face using a row finder and loop pile cutter. The blade must follow row channels and must never cross a loop row. Row-cut and trace-cut technique is used for seam preparation. Hook blades are used throughout.
Cut-loop carpet (a construction that combines cut and loop tufts in a pattern) follows loop pile protocol for the loop elements. The cutting technique prioritizes preserving the loop integrity while still severing the cut pile cleanly. Pattern alignment at seams is more demanding for cut-loop constructions than for either pure cut or pure loop pile.
Carpet tiles use straight utility knife cuts from the back for straight lines, and shears or rotary cutters for curves. Template use is standard for irregular shapes. Fraying is less of a concern due to dimensional backing stability.
The fiber composition of the carpet affects blade selection but not cutting direction. Nylon and polyester accept standard utility blades. Wool requires slightly slower passes but the same technique. Polypropylene and triexta are similar to polyester in cutting behavior. The distinction between nylon and other fiber types in durability and care is worth understanding if you are selecting carpet for a new installation — the comparison between nylon and polyester carpet explains the material properties that matter most.
Measuring and Marking: The Step That Determines Everything Downstream
No cutting method compensates for a bad measurement. This is worth stating explicitly because the cutting technique receives most of the attention in installation guides, while the measurement and marking step — the one that determines what gets cut — is treated as obvious.
Rooms are not rectangles. Walls are rarely perfectly straight. Measurements taken at one end of a room may differ from measurements taken at the other by a half inch or more in older construction. Professional carpet measurement involves taking dimensions at multiple points along each wall and planning the carpet layout around the largest dimension plus trim allowance, not around an assumed uniform dimension.
The standard allowance for cut-and-fit work is two to three inches of excess in each direction. This gives enough material to trim to final size after stretching and positioning without cutting so short that a measurement error leaves the carpet short of the wall.
All marking is done on the back of the carpet. Marking on the face risks leaving chalk or marker residue visible through the pile. Chalk lines are preferred for long cuts because a hand-drawn line has too much variation over distance. For short trim cuts, a metal straight edge pressed firmly against the carpet backing and marked with chalk is adequate.
Before marking any seam line, the carpet layout plan must account for pattern repeat if the carpet has a visible pattern or texture direction. Seams must be positioned so that the pattern continues across the join without visible offset. Calculating pattern repeat and positioning seams accordingly is done at the measurement stage, not at the cutting stage — by the time you are cutting, the seam location is already committed.
The same planning discipline applies to any flooring that requires precise cutting. If you are managing a full flooring renovation across multiple material types, the overview of carpet installation types provides context for how cutting requirements shift depending on the installation method used.
When Carpet Cutting Should Be Left to Professionals
Most straight cuts, trim work, and basic seaming in accessible rooms are within the capability of a careful DIYer with the right tools and a willingness to go slowly. But certain situations consistently produce results that require professional rework when attempted without experience.
Large rooms with multiple seams need a professional seaming iron and seam tape for proper bond strength. Heat-activated seam tape produces a fundamentally stronger bond than pressure-sensitive tape and eliminates the peak-and-valley bonding pattern that causes seam edge lifting over time. Without a seaming iron, seams in high-traffic areas will separate prematurely regardless of how cleanly the cut was made.
Patterned carpet with a repeat that must align across a seam is difficult to execute correctly without experience. The pattern repeat must be calculated, the carpet pieces positioned and rechecked before cutting, and the double-cut performed precisely along a line that maintains pattern continuity. A single cut that is slightly off-line can produce a pattern offset that cannot be corrected without wasting additional carpet.
Commercial installations on Berber or loop constructions in high-traffic areas should use professional equipment. The row-cut and trace-cut method on commercial loop carpet requires practiced technique and correctly calibrated tools. A seam that looks acceptable during installation will fail quickly if the backing is not prepared correctly and the seam tape bond is not complete.
If you are assessing whether a full installation is a DIY project or one for a contractor, the comparison between DIY and professional carpet installation covers the realistic scope of what each approach involves.
Frequently Asked Questions About Carpet Cutting
Is it better to cut carpet from the front or the back?
For most cut-pile carpets, cutting from the back produces a cleaner edge because the backing is a flat, visible surface that holds chalk lines well and allows the blade to sever fiber roots cleanly. For loop pile and Berber constructions, cutting must be done from the face using a row knife that follows the channels between loop rows — back cutting on loop pile risks crossing loop rows and triggering unraveling.
How often should carpet cutting blades be replaced?
On dense residential carpet, blades should be changed after every ten to fifteen feet of cutting, or at the first sign of resistance or dragging. A blade that tugs rather than slices is already producing a damaged edge. The cost of extra blades is insignificant compared to the visible damage that a dull blade causes.
How do you prevent carpet from fraying after cutting?
Apply latex seam sealer along the backing of the cut edge immediately after cutting. The sealer penetrates the primary backing and bonds fiber roots in place, preventing them from migrating outward under stress. For permanent exposed edges, professional carpet binding is the correct solution — seam sealer alone is not sufficient for an edge that will receive direct foot contact without being tucked or covered.
Can you cut Berber carpet with a utility knife?
Not reliably. A utility knife on Berber backing cuts across loop rows rather than between them, severing loop yarns at random points and triggering edge fraying. The correct tool is a loop pile cutter (row knife) used from the face of the carpet, following the row channel identified with a row finder. This preserves loop integrity along the cut edge and produces a seam that holds under traffic.
What is the double-cut seam technique?
The double-cut method involves overlapping two carpet pieces along the planned seam line by about an inch, then cutting through both layers simultaneously with a single knife pass along a straight edge. Because both edges are cut from the same line, they are mirror images of each other and fit together with zero gap. It is the standard professional method for producing invisible seams in cut-pile carpet and is significantly more reliable than cutting each piece independently and trying to match the edges.
