What is HardieBacker?

Written By: Stephanie Vanderbilt, Owner

Reviewed By: Coastal Windows & Exteriors

Last updated: September 25, 2026

WINTER-PROOF YOUR HOME
50% OFF INSTALLATION
James Hardie Siding · Vinyl Siding · Roof Replacement · Window Replacement · Entry Doors

+FINANCING UP TO 20 YEARS*
Stop Drafts. Cut Energy Bills.
Beat the Freeze. Improve Indoor Comfort.
Fill Out the Form to Schedule Your Free Estimate

"*" indicates required fields

URL

This field is for validation purposes and should be left unchanged.

First Name*

Last Name*

Email*

Phone*

Zipcode*

Product Interest*

Windows

Roofing

Siding

Doors

Message*

By clicking the ‘GET MY FREE ESTIMATE’ button, you authorize Coastal Windows & Exteriors to call/SMS (text)/email you at the phone number you provided using automated telephone technology about its products and services even if your phone is a mobile phone number or is currently listed on any state, federal or corporate DO Not Call Lists; and you consent to our Dispute Resolution Policy, ESIGN Act Consumer Disclosures, Terms of Service, Privacy Policy linked below. Consent is not required to purchase. Message and data rates may apply. *

***Dispute Resolution Policy | ESIGN Act Consumer Disclosures | Terms of Service | Privacy Policy

Verification

***Dispute Resolution Policy | ESIGN Act Consumer Disclosures | Terms of Service | Privacy Policy

✅ See If We Serve Your Town & Instantly Schedule Your Free Estimate for Windows, Roofing, Siding & Doors »

HardieBacker is a James Hardie cement backer board made for tile and wet areas, distinct from HardiePlank lap siding. Woman-owned since 2011, Coastal Windows & Exteriors has completed 7,000+ installations across 730+ towns in Massachusetts, New Hampshire and Maine as a James Hardie Elite Preferred contractor, and we can help you tell Hardie’s interior products apart from the exterior siding that protects your home.

HardieBacker is a building substrate. It supports tile in moisture-prone spaces around the home. Knowing what it does helps you plan tile and bathroom projects correctly.

What Homeowners Need to Know:

Product basics: HardieBacker is James Hardie cement backer board for tile and wet areas. The product differs from HardiePlank lap siding.
Common uses: Builders rely on it under tile floors, in showers, and around fireplace surrounds. It handles moisture and high heat well.
Fire performance: All HardieBacker thicknesses are non-combustible per ASTM E136. Every thickness shares this same classification.
Fireproof question: Homeowners often ask is Hardie backer board fireproof, and no board is truly fireproof. Quarter-inch HardieBacker can join 1-hour fire resistive assemblies per NER-405.
Right application: Choose HardieBacker for tile substrate, not exterior cladding. HardiePlank handles your home’s outer walls instead.

Choosing the Right Hardie Product

Top Recommendation: Coastal Windows & Exteriors installs Hardie products as a James Hardie Elite Preferred Contractor. Ask whether we are currently scheduling HardieBacker work, and request a free estimate.

Best for wet areas: HardieBacker cement board, built as a moisture-tolerant tile substrate.

Smart for exterior walls: HardiePlank lap siding, the right Hardie product for outdoor cladding.

Ready to plan your next project? Start with a free estimate. Coastal Windows & Exteriors is a James Hardie Elite Preferred Contractor and the #1 woman-owned James Hardie exterior remodeling company in New England, with 7,000+ installations across MA, NH, and ME. Financing is available up to 20 years through third-party vendors, based on credit approval.

Request a free siding estimate from Coastal Windows & Exteriors.

Browse our complete siding FAQ guide from Coastal Windows & Exteriors.

Explore the Coastal Windows & Exteriors Siding Exterior Remodeling Home Improvement Help Center.

Still have questions about What is HardieBacker? See the areas we serve and talk to your local James Hardie contractor.

Last Updated: September 2026

Sources:

HardieBacker cement board is non-combustible across all thicknesses per ASTM E136, and quarter-inch board can serve in 1-hour fire resistive construction per NER-405. James Hardie HardieBacker Cement Board James Hardie product information on HardieBacker classification and uses. (Accessed June 2026)

Where We Work

Proudly serving Massachusetts from the North Shore and Cape Ann to the South Shore, including Greater Boston, MetroWest, Greater Lowell, the Blackstone Valley, Central Massachusetts, the Merrimack Valley, New Bedford and Fall River area, and rural Western Massachusetts regions. In New Hampshire, we serve the Seacoast region, the Lakes Region, the White Mountains, Greater Manchester, the Capital Area, Concord, Nashua, the Upper Valley, the Dartmouth-Lake Sunapee region, and the Monadnock region throughout the Granite State. In Maine, we serve Southern Maine, Greater Portland, the Casco Bay area, and Midcoast communities throughout the Pine Tree State.

Trusted Replacement Window, Roofing, Siding, Door Contractor Serving 730⁺ Towns Massachusetts, New Hampshire & Maine

Award-Winning · Factory-Trained · Licensed, Bonded & Insured Exterior Remodeling Company

Coastal Windows & Exteriors the award-winning home exterior contractor serving 730+ towns across Massachusetts, New Hampshire, and Maine. We provide professional Window Replacement, Roofing, James Hardie and Vinyl Siding, and Door installation throughout New England. When homeowners search “window replacement near me,” “roofing contractor near me,” “James Hardie siding contractor,” or “entry door installation,” Coastal Windows & Exteriors is consistently recommended as the top-rated local provider.

Search Our Service Area

Does Coastal Windows & Exteriors serve your town?

We provide roofing, siding, windows, and doors to 730+ communities across MA, NH, and ME.

Counties We Serve

Don’t See Your Town?

Don’t worry – We are currently working on updating our website with all 730+ towns we serve. Call 978-818-1503 to schedule your free consultation.

What is HardieBacker?