How to Properly Maintain Your James Hardie Siding

maintain your james hardie siding

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A siding replacement project is an investment, so knowing how to maintain your James Hardie siding will help you make the most of it.

If you have chosen James Hardie siding, you already know the fantastic benefits and ROI it offers your home. The fact that it is a low-maintenance product was probably a significant factor in your choice.

But that doesn’t mean that there aren’t things you can do to keep your siding in the best condition possible, upping your curb appeal and energy efficiency.

Fiber Cement is Durable, but You Still Need to Maintain Your James Hardie Siding

James Hardie siding was created to be durable and long-wearing.

It is resistant to:

  • Pests
  • Rot
  • Swelling
  • Warping
  • Heat
  • Moisture

But, like any product, regular care and maintenance will go a long way. The extent of your siding maintenance will depend on the size and design of your home, the weather in your area, and your landscaping.

Show Off Your Siding with Trimmed Shrubbery

After forking out a large sum on a beautiful siding, why hide it behind shrubbery?

Keeping the garden around your home trimmed will show off your siding and protect it from excess moisture, chipping, and scratching.

The same applies to trees and low-hanging branches. Keep them trimmed to avoid damaging your roof and siding, particularly during storms.

Maintain Your James Hardie Siding by Keeping it Clean

Keep your siding looking pristine by cleaning it every 6-12 months. You must use a gentle cleaning method because damage to the trim or siding from improper cleaning or maintenance may void your warranty.

Steps to cleaning your siding:

  • Use a garden hose to remove dirt and debris.
  • Gently clean your siding with a soft brush or wet cloth in a side-to-side motion in the direction of the planking.
  • Do small sections at a time with a top-down approach.
  • Use a low-pressure water spray (less than 1500psi) with a wide fan tip and stand a minimum of 6ft from the siding.

Repair, Repaint, and Re-Caulk


James Hardie siding is a painted product; you will need to re-paint after 10-15 years. For nicks, scrapes, and nail holes, you can use the ColorPlus product touch-up kits.


Check the penetrations, flashings, plank, and trim connections when re-applying caulking. It’s best to choose a “permanently flexible” caulk and sealant to maintain your James Hardie siding.


You can repair dents, chips, and cracks with a cementitious patching compound if they are minor. If you notice a chip large than a dime, it’s best to replace the whole section.

Watch for Excess Water Exposure

Install gutters and downspouts and check them regularly for blockages. This will keep excess moisture off your siding, helping it last longer.

Avoid a sprinkler system that continuously wets your siding, or opt for drought-tolerant plants or a garden bed away from your siding.

Your Hardie siding can withstand snow, but it is essential not to use deicing salts, which can damage the finish. For example, opt for sand or gravel when tackling icy surfaces, keep a 6-inch clearance around your siding, and maintain drainage slopes.

Choose Professionals for the Best Installation

One of the best ways to maintain your James Hardie siding is to have it professionally installed. It is a product that requires expert knowledge and specialized equipment for the best installation.

When you choose a trusted company like Hawthorn Home Exteriors, you can be sure that your siding is of the highest quality with workmanship you can trust.

Hardie siding done right is incredible. But if done wrong, you will be left with many expensive maintenance issues.

Hawthorn Home Exteriors is here to help you maintain your James Hardie siding and make the most of your investment, so contact us to find out more.

Mark Moore

Mark Moore

Founder & CEO