Why Do Rugs Curl and How to Prevent it?

Rugs curl for three main reasons: how the rug is made, changes in humidity and temperature, and feet or furniture catching the edge. A new rug that was rolled for delivery will also curl at the ends for the first few days. Most curled corners flatten with a reverse roll, some weight and time, and an underlay stops them coming back. A lifted corner is also one of the easiest things in a house to trip on.

Why Do Rugs Curl?

Material and Construction
The material and construction of a rug are very important regarding its propensity to curl. Rugs made from synthetic fibres, like polyester or nylon, are more likely to curl than others that may be fabricated with natural fibres like wool or cotton. This is because most synthetic materials can be flexible and less dense, hence easily moved around and curled up. Synthetic fibres can also react to environmental changes differently, creating the possibility of curling. In most cases, natural fibres will have a stronger makeup that lets them hold on better through various conditions maintaining their shape for a longer time. First of all, the density and weight of the rug should be taken into consideration because the heavier and denser the rug is, the less likely it is to form a curl.

This also holds true for the weaving or tufting of a rug. Hand-knotted rugs are heavier and thus more stable; therefore, they are less likely to curl. Machine-made rugs can be lighter in weight, less dense, and may curl more easily compared to handmade ones. The weave in a hand-knotted rug is tighter and gives fine durability, not allowing it to curl. Machine-made rugs, while convenient and less expensive, tend to compromise on these aspects. The method of construction also bears an impact on the rug's durability and appearance; hand-knotted rugs are much finer looking and last longer.

Environmental Factors
Changes in humidity and temperature can make rugs curl. Humid conditions can result in the fibres becoming swollen, making the rug's edges lift. On the other hand, dry conditions can cause the fibres to contract and make the rug curl. Placing it in a room where the temperature and humidity remain stable can help. If there are sudden fluctuations in this regard, it will enhance this problem and make it difficult for the rug to lie flat. In that case, the indoor conditions can be controlled with a dehumidifier or humidifier. Choosing rug materials that are less reactive to moisture will lessen environmental factor-caused curling.

Foot Traffic and Use
Of course, rugs have a greater tendency to curl in areas with high foot traffic. Corners are most prone to lift from repeated stepping on them, which is further compounded and accelerated by the dragging of furniture or other heavy objects across the rug. Even in low-traffic areas, accidental kicks or movements could cause edges to curl up. Regular maintenance and proper placement help minimise this issue. Rug pads add extra cushioning and can reduce movement, which helps the rug lie flat. Watch how one moves furniture or items across the room and try to spread the weight to avoid curling at the ends in high-traffic areas.

Preventing and Repairing Curled Rugs

So now that we know the causes, how can we fix and/or prevent a curled up rug?

1. The Ice Cube Trick
One of the popular methods for flattening curled rug corners is using the ice cube trick. This method works like a charm and gets your corners flat again overnight and is cost effective!

It goes like this:

• Place a Weighted Object: Place something heavy, like a mug or a bottle, on top of the raised corner to hold it down.
• Apply Ice: Now, place some ice cubes on the area, particularly on the curled section.
• Let it Melt: Allow the ice to melt and dry on its own. As the fibres absorb the moisture and then dry, they will relax and lie flat.

This method works because the moisture helps relax the fibres, and the weight keeps the corner in place until it dries flat.

2. Rug Pads
Probably one of the best ways to prevent curling is to use a rug pad. A rug pad provides extra cushioning and grip, thereby providing a tight hold on the rug that prevents movement, which very easily causes curled edges. Besides holding it in place, rug pads can also protect the floor underneath and extend the life of your rug.

3. Proper Placement
Placing rugs in low-traffic areas will help prevent curling. If your rug is located in a high-traffic area, rearrange furniture so that it anchors corners to stop movement and lifting. Be careful where you place your rug to avoid frequently tripped edges.

4. Different Cuts of Rugs
Curling can also be because of how the rug has been cut. Bound edges, such as serged or hand-stitched ones, keep rugs from curling as much as those with looser or unfinished edges. Be that as it may, it's not impossible for any rug to curl with time under typical use and environmental impacts.

Serged Edges: These are tightly bound and often stitching is added for reinforcing, so they curl less.
Hand-stitched Edges: Hand-stitched edges, like serged edges, are also reinforced and hence less prone to curling.
Unbound Edges: Unbound or loosely bound rug edges are more predisposed to the curling problem because they lack reinforcement that would hold the fibres intact.

5. Regular Maintenance
The regularity of maintenance will help one avoid curling to a great extent. Vacuum your rug regularly to prevent dirt and dust from building up in the rug fibres. Turning the rug around every couple of months gives it even wear and avoids curling at the edges from continuous foot traffic in only one place.

6. Professional Help
If your rug just keeps curling up, then, in spite of trying all the methods, seek professional help. The rug repair professional will assess your rug and come up with solutions such as rebinding edges or applying a special treatment that will hold the fibres down in their places.

How to Stop Rug Corners Curling on Carpet

A rug on carpet has a different problem from a rug on tiles or timber. The carpet pile underneath lets the rug creep, and every time it moves, the corners ruck up. Rubber grip pads made for hard floors do not hold well on carpet.

• Use an underlay made for rugs on carpet, not a hard floor pad. It grips both the rug and the carpet, so the corners stop getting pushed up.
• Anchor the corners with furniture. Front sofa legs or a chair leg on a corner keeps it down better than tape.
• Reverse roll the curled end (below), then leave something heavy on the corner for a day or two.

Our guide to stopping a rug from slipping has more on choosing an underlay.

How to Flatten a New Rug That Arrived Rolled

Rugs are delivered rolled, and the ends want to keep that shape for a few days. Unroll it, then roll it the other way with the pile on the outside and leave it for a few hours. Lay it flat in a warm room with books on the corners. Most rugs usually settle within a week.

Why Carpet Edges Curl (Wall-to-Wall Carpet)

If it is fitted carpet lifting at a wall or doorway rather than a loose rug, the cause is different. The usual reasons are:

• The carpet has come off the gripper strip along the wall, often after furniture was dragged across it.
• The carpet has stretched and lost tension over the years, which also shows as ripples across the room.
• It got wet and dried unevenly, or the door bar at a doorway has worked loose.

A loose edge can be hooked back onto the gripper, but a carpet that has stretched needs re-stretching with a power stretcher, which is a job for a carpet layer. If the carpet is old enough that it keeps happening, it may be time to replace it: see our carpet in Sydney, measured, supplied and installed.