Fireplace Mantels: How to Build & Install a Mantel Safely

Revised May 28, 2024

Building a fireplace mantel can be a rewarding DIY project, but getting it right for safety and aesthetics is crucial. Before you start, we recommend consulting with your local WE LOVE FIRE® experts. They can help you determine the correct clearances for your fireplace, offer design advice, and even provide a cost estimate for a custom-built or pre-fabricated mantel. A professionally crafted mantel might surprise you with its affordability!

However, if you want to build your wooden mantel, keep reading. You will need to remember several details as your project moves forward.

Whether you’d like to update an existing fireplace or install a new one as part of a remodeling or building project, fireplace mantels give that fireplace character and charm. They showcase precious family photos and mementos. They’re an extension of you and your lifestyle. But remember, clearances are not just a suggestion but a critical safety measure for wooden fireplace mantels.

 

How to Build a Fireplace Mantel Yourself_ Wood Fireplace Ambiance with the Ambiance Mantel The Lexington

Wood Fireplace Ambiance with the Ambiance Mantel The Lexington

CLEARANCES ARE CRITICAL

Besides mounting a mantel firmly on a wall so it doesn’t fall, the most important thing to remember about a wooden mantel is the mandatory clearance requirements. Whether it’s a gas or wood fireplace, clearances refer to the distance from the top and sides of the fireplace opening to anything combustible, including a wooden mantel.

Fireplace mantels can be made from solid wood, MDF board, or laminated plywood. All are combustible. Fireplace clearances to wood mantels or anything that can burn are not optional. You must ensure clearances are maintained. Because of the stains and sealants often used in wood, mantels without proper clearances will overheat. They can actually get hot enough to ignite and burn.

ALL clearance requirements must be followed to the letter! It is critical that you follow the clearance requirements for your specific fireplace model. This information is readily available and clearly outlined in the owner’s manual. Remember, these requirements are not suggestions but essential for your safety. If you need help, check with your WE LOVE FIRE® expert.

Whether it’s a gas fireplace or a wood-burning model, mantel clearances vary from one fireplace to the next. Spend some quality time reading the owner’s manual for your fireplace. Understand all installation requirements, including those for a combustible mantel. Checking any specific local codes that may apply would also be a good idea.

This is an important reminder we’ve mentioned before: as with all clearances, not just mantel clearances, remember the rule: ‘more is better’! Add two or three inches to any clearance requirement. If the manufacturer says 6″, there’s nothing wrong with 8″. If the requirement for combustibles is 18″, go with 20″ or 22″. You get the idea. It’s like that extra scoop of ice cream on a hot summer day: MORE IS ALWAYS BETTER!

What Size of Fireplace Mantel is Right?

You want the mantel to look “proportionally correct.” Consider the size of the fireplace, the finishing material around the fireplace, the size of the room, and the ceiling height. In most cases, most mantels are five to seven feet long. Barn beams or large timber or log mantels are sometimes larger, but most mantels are usually about six feet long.

The depth of the mantel, that is, the distance from the wall to the front edge and sometimes called a “shelf,” is usually less than 10”. Most are in the range of 6” – 9” deep. A 1” x 8” board, regardless of species, is ¾” x 7¼”. Lots of do-it-yourselfers use a 1” x 8” for the top “shelf” of the mantel. It is important to note that there is a direct relationship between the depth of the mantel and how high the mantel is to be hung above the fireplace. This sketch is from an owner’s manual and shows this specific fireplace’s depth/height relationship. How to Build a Fireplace Mantel Yourself_ sketch eng

Dimensions and Mounting Basics

We won’t provide detailed plans or woodworking techniques for building the mantel itself. We trust you have the necessary skills if you’re building your own. As a general guideline, many wooden fireplace mantels are roughly 6 feet long, 7 ¼ inches deep, and between 5 and 12 inches high.

However, we’d like to share a proven method for securely mounting your mantel to the wall: using a mitered hanger board, also known as a French cleat.

Step-by-Step Guide to Mounting Your Fireplace Mantel

  1. Create the French Cleat: Rip a 2″ x 4″ board lengthwise at a 45-degree angle. This creates two identical pieces with angled edges.

  2. Mount the Wall Bracket:  Secure one piece of the cleat to the wall, ensuring you screw it into solid framing members (studs), not just drywall. Carefully measure the mounting height, accounting for the manufacturer’s minimum mantel clearance requirements. Drill pilot holes to prevent the wood from splitting and ensure the wall bracket is perfectly level.

  3. Attach the Mantel Bracket: Screw the other piece of the cleat (the “mate”) to the back of the mantel upside down.

  4. Hang the Mantel: The angled edges of the cleats will interlock, allowing you to simply hang the mantel onto the wall bracket. Ensure a snug fit for stability.

Additional Tips:

  • If your mantel has corbels, a breastplate, or legs, attach them before mounting it to the wall.
  • When determining the overall mantel width and the wall bracket’s height, consider the legs’ height and clearance requirements for mantels with legs.

Important Note: Always check and adhere to your fireplace manufacturer’s mantel clearance requirements. These are crucial for safety.

Fireplace Mantels for Electric Fireplaces

You can install mantels for electric fireplaces using the same techniques described above. However, the heat from an electric fireplace is substantially less than from a gas or wood-burning fireplace. Whether the heat is top-vented or bottom-vented, clearances are not an issue with an electric model. The specific mounting height for a wooden mantel for an electric fireplace can be determined wherever the homeowner prefers.

How to Build a Fireplace Mantel Yourself? Amantii Electric Fireplace

Amantii Electric Fireplace

 

Below is a list of fireplace and grill stores that service Ontario (ON)

Ajax, ON

Topfire Fireplace and Barbecue Inc.
487 Westney Rd. S
Ajax, ON L1S 6W8

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Aurora, ON

Topfire Fireplace and Barbecue Inc.
15483 Yonge St., Unit 1C
Aurora, ON L4G 1P3

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Belleville, ON

Friendly Fires
69, Dundas East
Belleville, ON K8N 1B9

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Burlington, ON

Barbecues Galore
3100 Harvester Road
Burlington, ON L7N 3W8

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Cambridge, ON

Bast Home Comfort Inc.
471 Hespeler Rd. 
Cambridge, ON N1R 6J2

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Carleton Place, ON

Friendly Fires
11384 Highway 7
Carleton Place, ON K7C 3P1

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Cobourg, ON

Friendly Fires
70 King Street East
Cobourg, ON K9A 1K9

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Collingwood, ON

Chantico Fireplace Gallery Inc
209784 Hwy 26
Blue Mountains, ON L9Y 0L8

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Concord, ON

The Fireplace Specialist
19-391 Edgeley Blvd.
Concord, ON L4K 4A7

Etobicoke, ON

Barbecues Galore
1470 The Queensway
Etobicoke, ON M8Z 1T5

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Goderich, ON

Huron Fireplaces
308 Huron Rd
Goderich, ON N7A 3A2

Hamilton, ON

Chadwicks & Hacks
682 Fennell Avenue East
Hamilton, ON L8V 1V4

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Huntsville, ON

The Fireplace King inc.
14 Howland Drive, Unit 1
Huntsville, ON P1H1M3

Kincardine, ON

Chantico Fireplace Gallery Inc
6 Ashfield-Huron
Kincardine, ON N2Z 2X3

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Kingston, ON

Friendly Fires
271 Dalton Ave.
Kingston, ON K7K 6Z1

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London, ON

Porky's BBQ & Leisure
1075 Sarnia Road
London, ON N6H 5J9

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Markham, ON

Kastle Fireplace LTD
8294 York Durham Line
Markham, ON L0H 1J0

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Meaford, ON

Chantico Fireplace Gallery Inc
158185 7th Line
Meaford, ON N4L 1W5

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Mississauga, ON

Ontario Hearth Fireplaces
3425 Laird Road Unit #2
Mississauga, ON L5L 5R8

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Niagara Falls, ON

The One Stop Fireplace Shop LTD
4332 Drummond Road
Niagara Falls, ON L2E 6C3

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North York, ON

The Fireplace Company
2854 Dufferin St.
North York, ON M6B 3S3

Oakville, ON

Barbecues Galore
490 Speers Road
Oakville, ON L6K 2G3

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Orangeville, ON

Its in the Shed
7 Little York Street
Orangeville, ON L9W 1L8

Ottawa, ON

Capital BBQ
12 Grenfell Crescent
Ottawa, ON K2G 0G2

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Pembroke, ON

Performance Woodburning & Gas
204 Boundary Road East
Pembroke, ON K8A 6W4

Penetanguishene, ON

Home & Cottage Centre
4 Centennial Drive
Penetanguishene, ON L9M 1G8

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Peterborough, ON

Friendly Fires
971 Highway 7
Peterborough, ON K9J 6X7

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Sarnia, ON

A Village Fireplace Shop Ltd.
623 Broadway St
Wyoming, ON N0N1T0

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Stratford, ON

Tri-County Brick
320 Home st.
Stratford, ON N5A 7C9

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Sudbury, ON

Nordic Energy Systems LTD
2324 Long Lake Road
Sudbury, ON P3E 5H4

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Thunder Bay, ON

Bob's Woodburners & Fireplaces
803 Memorial Avenue
Thunder Bay, ON P7E 3Z7

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Toronto, ON

Marsh's Stoves & Fireplaces
3322 Dundas Street W
Toronto, ON M6P 2A4

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Waterloo, ON

Bast Home Comfort Inc.
12-620 Davenport Road
Waterloo, ON N2V 2C2

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Windsor, ON

Scott's Fireplace Select, Inc.
2 North Talbot Road
Maidstone, ON N0R 1K0

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For more information, contact your local fireplace and grill store.

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