Quick answer: To replace sisal or cardboard on a DIY vertical post without rebuilding, measure the post, buy rope or fabric with a little extra, or switch to a removable sleeve or a stack of cardboard rings. Check the core and base while the covering is off, replace only what is damaged and design the new surface so the next swap takes minutes.
Once a scratching post is well used, the question is not whether to replace the surface but how. Rewrapping with the same rope is the obvious option, and it works. But it is also a chance to change the materials or the design so the next replacement is quicker, cheaper or better suited to how your cat scratches.
This guide focuses on parts: what to buy, how much, and which replacement systems make the most sense for a homemade vertical post.
Measuring Before You Buy
Measure the height of the section you want to cover and the post's circumference with a soft tape. For rope, divide the height by the rope's diameter to get the number of turns, multiply by the circumference and add about 10 per cent for the ends and any mistakes. For fabric, cut a piece as tall as the section and as wide as the circumference plus 5 cm for overlap.
| Post | Height covered | Approx. rope (8 mm) |
|---|---|---|
| Small, 7 cm square | 60 cm | About 22 m |
| Medium, 9 cm round | 80 cm | About 30 m |
| Large, 12 cm round | 100 cm | About 50 m |
Choosing Rope Thickness
Thinner rope, around 6 mm, gives a finer texture and wraps tightly around small posts. Thicker rope, 8 to 10 mm, lasts longer and suits large cats that pull hard. The San Francisco SPCA's guidance on scratching posts stresses a rough, sturdy surface; natural, undyed sisal rope provides that. Our complete guide to sisal scratchers explains grades and fibres.
Sisal Fabric Instead of Rope
Sisal fabric is woven into a flat mat. It fits square posts well, gives a smooth modern look and is quick to staple on. Many cats like it as much as rope, though heavy scratchers wear through it a little faster. Our sisal fabric vs rope comparison covers the trade-offs.
Removable Sleeves: The Quick-Swap Option
A sleeve is a tube of sisal fabric or rope wrapped around a thin card or plastic liner, sized to slide over the post. When it wears, you slide it off and fit a new one. To make one, wrap sisal fabric around a sheet of thick card rolled to the post's size, staple the fabric seam and slide it on. A strip of hook-and-loop tape at the top and bottom holds it in place.
Make two sleeves at once. One goes on the post and the other waits in a cupboard, so when the first wears through you can swap it the same day and rewrap the old liner at leisure. Sleeves also make it easy to try different textures: rope on one, fabric on the other, and see which your cat prefers.
Cardboard Ring Stacks
For cats that love shredding, a stack of corrugated cardboard rings threaded onto the post's core makes a cheap, replaceable surface. Cut rings from double-wall cardboard with a hole the size of the core, stack them tightly and cap the top with a wooden disc screwed into the core. Replace the worn middle rings as needed. Our best corrugated cardboard guide explains which cardboard lasts longest.
Planning How to Replace Sisal or Cardboard on a DIY Vertical Post
- Decide which surface: rope, fabric, sleeve or cardboard rings
- Measure and buy materials with 10 per cent extra
- Strip the old covering and check the core and base
- Replace any damaged part before fitting the new surface
- Fit the new surface tightly and fix the ends securely
Our replacing sisal on a large scratcher shows the stripping and wrapping steps in detail.
Swapping a Damaged Core
If the core is cracked, soft or loose, replace it rather than wrapping over it. Unscrew it from the base, cut a new piece of timber or a thick cardboard tube to the same height and screw or bolt it back through the base. A solid timber core takes rope staples better than a tube and lasts longer.
Mark the old core's height and the position of its screws on the base before removing it, so the new core goes back exactly where the cat expects it. If the base screw holes are worn, plug them with glued dowels and drill fresh pilot holes beside them.
Upgrading the Base
A post that wobbles will not be used, however good its surface. If the base is too small, screw a larger, heavier board underneath it. A base at least twice the post's width on each side, with rubber feet, keeps most posts steady. Our vertical post that lasts longer than store-bought covers base design.
Where to Find Parts
- Hardware stores: sisal rope, staples, timber, plywood
- Craft and upholstery shops: sisal fabric, hook-and-loop tape
- Packaging suppliers: double-wall cardboard sheets
- Your own recycling: thick boxes for cardboard rings
- Pet stores: replacement sisal mats and cardboard refills
Buy rope by the coil rather than in short packs; it is usually cheaper per metre and leaves enough for a second refresh. Check that the label says natural, untreated sisal, and avoid oiled or dyed rope with a strong smell.
Fixing the New Surface Securely
Staple rope ends on the side facing the wall, and add a thin line of non-toxic, water-based glue every 10 cm for the first and last turns. For fabric, fold edges under before stapling so there are no loose threads. Humane World for Animals' advice on destructive scratching notes that cats need a surface they can dig into; a loose covering that slips will not satisfy them.
Getting the Cat Back on the Post
Put the post back in exactly the same spot. The Ohio State Indoor Pet Initiative recommends placing scratching posts where cats already scratch. Rub a little dried catnip on the new surface if your cat responds, and reward the first scratches.
When the post is past saving
Sometimes the post is in the wrong place for the job. If your cat scratches the sofa arm rather than the post, a scratcher table that sits flush against the arm may work better than any replacement surface. The CozeCat Side Table has a replaceable sisal face; compare sizes on the CozeCat Side Table page.
When the post is past saving Sold as Left, Right or a Pair. Delivery is Next-day shipping, and you have 30 days to return an unused table; return shipping is paid by the buyer unless it arrived damaged or defective.
Designing for Easy Replacement Next Time
If you are rewrapping anyway, consider building the replacement in from the start: a removable sleeve, a cardboard ring stack or sisal fabric fixed with a few staples along one seam. Each makes the next refresh a matter of minutes. Our replaceable sisal mats cost of ownership guide compares the long-term cost of each approach.
How Often to Expect a Replacement
With an enthusiastic scratcher, expect to replace sisal rope about once a year, sisal fabric a little more often and cardboard every month or two. Rotating the post a quarter turn every few weeks spreads the wear. Our vertical vs horizontal scratchers article helps if your cat's preferences change.
Post Replacement Parts FAQs
How do I calculate how much sisal rope I need?
Divide the height you want to cover by the rope's diameter to get the number of turns, then multiply by the post's circumference. Add about 10 per cent for the ends and mistakes. An 8 mm rope on a medium post covering 80 cm usually needs about 30 metres.
What is a scratching post sleeve?
A sleeve is a removable tube of sisal fabric or rope, wrapped around a thin card or plastic liner sized to slide over the post. When it wears out, you slide it off and fit a new one, which is much quicker than unwinding and rewrapping rope.
Can I use cardboard instead of sisal on a vertical post?
Yes. A stack of corrugated cardboard rings threaded onto the core and capped with a wooden disc makes a cheap, replaceable surface. It wears faster than sisal, but cats that love shredding often prefer it, and worn rings are easy to swap.
Should I replace the core when I rewrap a post?
Only if it is cracked, soft or loose. Check it when the old covering is off. A solid timber core takes staples well and lasts for years. If the core is sound, tighten its fixing to the base and rewrap over it.
