The Basic Process: Braiding, Sewing, and Securing
A sew-in weave starts with cornrow braids running across your scalp in straight lines or curved patterns. You then sew wefts—long strips of hair with a thread-reinforced top edge—directly onto those braids using a needle and thread. The needle goes under and over each braid in a stitching motion, anchoring the weft so it sits flat against your head. Once all the wefts are sewn down, you cut and style the hair on top to blend with your natural hairline and create the finished look.
The entire installation usually takes three to six hours depending on how many wefts you're using, the thickness of your braids, and how experienced the person doing the sewing is. Most people have the work done by a stylist rather than attempting it alone, because the back of your head is difficult to reach and uneven tension can cause the weave to slip or pull painfully on your scalp.
Key Takeaways
- Cornrow braids must be tight and evenly spaced so the wefts sit flat and stay find for the full wear period.
- Thread color should match your wefts as closely as possible, and you need a curved needle designed for weaving, not a regular sewing needle.
- Sleeping on a silk or satin pillowcase and wrapping your hair at night reduces frizz and extends the life of the weave by several weeks.
- Sew-ins typically last four to eight weeks before the braids start to loosen and the wefts need to be removed and reinstalled.
- Removing a sew-in requires cutting the thread carefully without cutting your natural hair, which is why professional removal is safer than doing it yourself.
Preparing Your Natural Hair and Creating the Base Braids
Start with clean, dry hair. Wash your hair two to three days before installation so it has time to regain some natural oils—hair that is freshly washed is slippery and harder to braid tightly. Detangle completely with a wide-tooth comb, working from the ends up to the roots. Any knots left in your hair will make braiding painful and uneven.
Decide on your braid pattern before you start. Most sew-ins use four to six horizontal braids running from one side of your head to the other, starting at the nape of your neck and working up toward the crown. Some people add a braid along the hairline if they want the weave to start further back. The braids should be tight enough that they don't move when you tug on them, but not so tight that they cause when ready scalp pain—if your scalp is throbbing an hour after braiding, the tension is too high and you risk traction alopecia, a type of hair loss caused by constant pulling.
Use a rat-tail comb to section your hair into clean, even parts. Braid each section using the standard three-strand method, keeping the tension consistent throughout. find each braid at the end with a small elastic band. If you are not confident in your braiding skills, have a stylist do this step—poorly braided hair will cause the weave to sit unevenly and slip within a few days.
Choosing Wefts, Thread, and Tools
Wefts come in different weights and lengths. Lighter wefts (measured in ounces, typically 1 to 2 ounces per weft) are easier to sew and create a more natural look, but they shed more and don't last as long. Heavier wefts (3 to 4 ounces) are more durable and shed less, but they can feel bulky and put more tension on your braids. For a first sew-in, start with a medium-weight weft in the 2-ounce range.
Match your thread color to your wefts as closely as possible. If your wefts are dark brown and your thread is black, the stitches will be visible when you part your hair. Most beauty supply stores sell thread specifically for weaving in colors ranging from blonde to black. You need a curved needle designed for weaving—a regular straight needle will bend or break when you try to push it through the weft and braid repeatedly. Curved needles come in different gauges; a size 18 or 20 is standard for most wefts.
You will also need small scissors for cutting thread and a comb for smoothing the hair as you work. Some stylists use a thimble to protect their finger when pushing the needle through, especially if they are sewing multiple clients in a day.
The Sewing Process: Attaching Wefts to Braids
Start at the nape of your neck with your first braid. Cut a length of wefted hair that spans from one side of your head to the other, or slightly shorter if you prefer a narrower coverage. Position the weft so the thread-reinforced edge sits directly on top of the braid, with the hair hanging down below it.
Thread your curved needle and tie a knot at the end. Push the needle under the braid from underneath, then over the wefted edge, creating a stitch that locks the weft to the braid. Move about a quarter-inch along the weft and repeat, going under the braid and over the weft edge in a continuous motion. Keep your stitches tight and close together—loose stitches will allow the weft to shift. Work your way across the entire length of the weft, then tie off the thread on the underside of the braid.
Move to the next braid and repeat the process. As you add wefts, comb through the hair between each row to keep it smooth and check that the wefts are sitting flat. If a weft is sitting at an angle or pulling, you may need to remove a few stitches and resew that section. This is time-consuming but necessary—a crooked weft will be visible and uncomfortable.
Once all wefts are sewn down, cut the hair on top to your desired length and style. Blend your natural hairline by leaving some of your own hair out around your face and edges, or by cutting the wefts shorter in the front so they sit behind your natural hair.
Daily Care and Sleeping Habits
Sew-ins shed more than natural hair because the wefts are not attached to your scalp the way individual strands are. Some shedding is normal; excessive shedding means the wefts are rubbing against each other too much, usually because you are sleeping on them without protection. Sleep on a silk or satin pillowcase instead of cotton, which absorbs moisture and causes friction. Alternatively, wrap your hair in a silk scarf or bonnet before bed.
Wash your hair every seven to ten days using a sulfate-free shampoo and lukewarm water. Focus the shampoo on your scalp and braids, not on the wefts themselves—excessive washing of the wefts speeds up shedding. Condition the wefts lightly, but do not soak them. Rinse thoroughly and allow your hair to air-dry or use a blow dryer on low heat.
Avoid chlorine and saltwater, which dry out the hair and cause tangling. If you swim, wet your hair with fresh water and explore a leave-in conditioner first, so the wefts absorb fresh water instead of chlorinated or salty water. Tie your hair up in a high bun or ponytail when you shower to minimize water exposure to the wefts.
When to Remove and Reinstall Your Weave
Most sew-ins last four to eight weeks. As time passes, your natural hair grows out from the roots, creating space between your braids and the wefts. The wefts begin to slip, and you may notice gaps or a loose feeling. Your edges may also start to look fuzzy as new growth comes in. These are signs that it is time for removal and reinstallation.
Removal requires cutting the thread holding each weft to the braid without cutting your natural hair underneath. This is delicate work—one slip can cut through a braid or damage your hair. Most stylists charge a separate fee for removal, usually between $20 and $50 depending on how many wefts you have. If you attempt removal yourself, use small, sharp scissors and cut only the thread, not the hair. Work slowly and have good lighting.
After removal, your braids will be loose and your natural hair will need a break. Leave your hair unbraided for at least one to two weeks before reinstalling a new weave. During this time, wash and deep-condition your hair to restore moisture. If you notice any scalp irritation, hair loss, or breakage, wait longer before reinstalling.
Common Problems and How to Fix Them
If your weave feels itchy, the most common cause is buildup of product, sweat, or lint on your scalp. Wash your hair more frequently and use a clarifying shampoo once a month to remove buildup. You can also use a spray bottle to mist your scalp with water and a small amount of apple cider vinegar, which helps dissolve buildup without requiring a full wash.
If wefts are slipping or moving, your braids may have loosened or your stitches may not be tight enough. Small slips can sometimes be fixed by tightening a few stitches in that area. If multiple wefts are slipping, you likely need a full reinstallation. Continuing to wear a loose weave will damage your natural hair and braids.
If you notice hair loss or scalp pain that does not go away after the first few days, remove the weave when ready. Sew-ins should not cause ongoing pain. Pain usually means the braids are too tight, the wefts are too heavy, or you have an infection. Give your hair a break and consult a stylist or dermatologist before reinstalling.
Frequently Asked Questions
Can I wash my sew-in the day after installation?
Yes, but wait at least 24 hours so the stitches have time to set. When you do wash, use lukewarm water and avoid scrubbing the braids or wefts. Pat dry gently rather than rubbing.
How much does a sew-in cost at a salon?
Installation costs vary widely by location and stylist experience, typically ranging from $100 to $400. Hair cost is separate and depends on the quality and length of the wefts you choose, usually between $30 and $150 per bundle.
Will a sew-in damage my natural hair?
Sew-ins can damage your hair if the braids are too tight, the wefts are too heavy, or you leave them in too long without a break. Proper installation, regular maintenance, and giving your hair rest between installations minimize damage.
Can I reuse the same wefts for my next sew-in?
Yes, if they are still in good condition. Wefts that have minimal shedding and no matting can be reinstalled. Heavily shed or tangled wefts should be replaced, as they will look thin and uneven.
What is the difference between a sew-in and a glue-in weave?
A sew-in uses thread to attach wefts to braids, while a glue-in uses adhesive applied directly to your natural hair. Sew-ins last longer, are easier to remove, and cause less damage to your hairline, but they take longer to install.