How long do cedar blocks last?

Author: Prof. Jamel McLaughlin II  |  Last update: Monday, December 29, 2025

Initially, when cedar blocks are fresh, their moth-repelling properties are at their peak. Over time, however, the intensity of the scent diminishes, which can reduce their effectiveness against moths. Typical Effective Lifespan: Generally, cedar blocks remain effective for about one to three years.

How often do you need to replace cedar blocks?

Cedar is a long-lasting repellant, but if the cedar chips or blocks are older than three years, they need to be replaced.

Does cedar blocks lose its effectiveness?

You can purchase cedar hangers, cedar blocks for moths, and sachets for your clothes and bureaus, but they will be effective for about 3 months. After that, your two options are to go out and purchase more cedar items or to sand down your existing cedar and apply more oil.

Can cedar blocks be refreshed?

1. Refresh Cedar Blocks to Maintain Effectiveness. Sanding Blocks: Lightly sanding cedar blocks every few months removes the top layer of wood, rejuvenating the scent and effectiveness.

How long are cedar blocks good for?

How long your cedar blocks will last largely depend on the product quality. On average, a premium cedar block should last up to 2 years. However, this should be coupled with proper maintenance. One of the best ways to maintain your cedar blocks is to apply cedar oil on them, using a clean clothing material.

How Long Does Untreated Cedar Last Lifespan, Durability & Expert Tips!

Will cedar blocks keep bugs away?

Cedar has been used as an insect repellent for many years. People have built cedar closets in their homes. They have also used cedar hangers and put cedar blocks in dresser drawers to keep moths away from their clothes. Some studies suggest that the cedar repels insects because of the smell of the cedar oil.

How long will untreated cedar last?

It resists water reasonably well and doesn't tend to crack. Cedar lasts about 20 years if not treated, but some damage may be noticeable from heavy traffic. Cedar can last for decades when used in your outdoor projects if cared for properly.

Do cedar blocks repel mice?

The secret to cedar's ability to run off a whole host of unwanted critters are aromatic hydrocarbons (phenols) and acids it contains that are toxic. The phenols, which give cedar its delightful earthy scent, are what repels fleas, moths, cockroaches, venomous snakes, mice and rats.

Does cedar last longer than pressure treated wood?

Cedar left untreated outdoors will generally last around 15-20 years due to its natural oils and decay resistance. Pressure-treated wood, treated with chemicals to resist decay and insects, can last significantly longer, often 30 years or more.

Do cedar blocks repel roaches?

Cedarwood and cedar oil have a strong scent that repels roaches. You can use cedar chips, blocks, or oil near roach-prone areas.

What are the negatives of cedar?

Although cedar lasts a long time under ideal conditions and treatment, it tends to degrade more quickly when it's used for ground-level decks, and if it's shaded, it will slowly dry out.

Do cedar blocks repel bed bugs?

Can Cedar Wood Kill Bed Bugs? Cedar wood will not kill bed bugs. The oil in red cedar wood won't likely kill them, but will repel them with the unpleasant smell. Some cedar oil mixtures are used as natural remedies to kill pests like flying insects, roaches, termites and bed bugs.

Do cedar blocks really repel moths?

Although cedar and other herbal scents can repel moths, on their own it's unlikely they would be effective against moths or their larvae. Mothballs, although effective, should only be used as a last resort.

Which is better, mothballs or cedar?

Cedar is the better alternative to mothballs

Killigan's Cedar Planks are a natural insect repellent that emit a pleasant, delightfully woody scent. The cedar planks are (unlike mothballs) non-toxic, non-poisonous and non-harmful to humans and pets, making them an effective, safe and environmentally-friendly choice.

Does cedar warp over time?

Some types of wood are less likely to become warped than others, including: Cedar – Cedar is an incredibly dense wood species and is naturally resistant to cracking due to moisture changes.

Do cedar blocks repel carpet beetles?

Silverfish: Cedar is significantly repellent to silverfish—specifically the firebrat, effectively deterring them without toxicity. Certain beetles: Repels species that infest stored fabrics and carpets. Studies confirm eastern red cedar wood significantly deters black carpet beetles.

Will cedar turn grey if sealed?

If you prefer to preserve the original color of your cedar fence, there are steps you can take to slow down the greying process: Seal and Protect: Applying a high-quality wood sealant or finish to your cedar fence can help shield it from UV radiation and moisture, preserving its natural color for a longer time.

How do you make cedar wood last longer?

Substances such as para-phenylenediamine or cresol help the wood to last long. However, another method of preservation is to combine wax and oil such as carnauba, bee and candelilla waxes along with linseed, sunflower and jojoba oils. These will help prolong the life of your cedar wood and make it more durable.

Will cedar rot if buried?

Don't put cedar where it's in direct contact with the ground or set it in concrete. It may last for a while, but eventually it will rot and deteriorate.

What bugs do cedar blocks repel?

Not only has it historically been used to repel moths, keep bees and wasps away, deter termites from playgrounds (and other structures made of wood, including homes), and ward off insects from one's garden (when used as chips), but it has also been used as medicine to cure ailments such as colds, measles, worms and ...

Does Irish Spring soap keep mice away?

Irish Spring soap is not likely to keep mice away from your house– and the strong fragrances could even be attractive to them. Rats & mice might initially be deterred by the overwhelming odor, but after a while they'll get used to it, and may even take a nibble to test it as food.

Is cedar toxic to cats?

Cedar. Cedar trees have a wide variety of species some of which can be toxic to cats. In North America, there are specifically 5 genera and about 26 species of cedar trees most of which are Juniperus and Thudra genera. The toxic substances in Cedar trees and more specifically in the cedar wood are phenols and terpenes.

What are the disadvantages of cedar?

Disadvantages Of Cedar Wood
  • Hardwood cedars may not last as long as some other hardwood species.
  • Some types of softwood cedar can become dented easily.
  • It is expensive compared to wood like pine.
  • It requires regular maintenance as the color may fade away due to chemical reaction.

What is the longest lasting non treated wood?

Commonly used for fences, roofing and siding: Cedar can last for years without any maintenance or treatment. On the negative side, it is much softer and more brittle than the other species on this list with the exception of cypress.

Should you stain or seal cedar?

It is highly recommended that you stain/seal your cedar fence as it is a great way to ensure it lasts for years to come! Wood fences are traditionally beautiful and are a significant financial investment in the value of your home and property. However, it is normal for your cedar fence to fade over time.

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