Floating Mantel Brackets

Choose the Right Floating Mantel Bracket

Two things determine which mantel bracket you need: how thick your mantel is, and how deep it runs from wall to face. The Glenn HD handles thicker, deeper mantels. The Glenn MD handles standard-profile mantels with a slimmer cross-section. Get these measurements before you order.

Glenn HD

• Mantel thickness: 3½” minimum
• Mantel depth: 7”–14”
• Load capacity: 300–1,500 lbs
• Rod diameter: 1” OD
• Best for: thick beams, live-edge slabs, heavy custom builds

Glenn MD

• Mantel thickness: 2¼”–3¼”
• Mantel depth: 7”–10”
• Load capacity: 200–1,000 lbs
• Rod diameter: ¾” OD
• Best for: standard lumber mantels, slimmer profiles

Both systems require installation into wood studs, structural posts, or masonry — not drywall alone. Custom rod lengths are available if your mantel runs shallower than 7” deep.

Not sure which one fits your project? Call us at 949.244.1083.

Glenn HD — For Thick, Heavy Mantels

Most mantels fail at the wall, not the wood. The mounting system transfers every pound of mantel weight — and everything sitting on it — into the framing behind the drywall. If the hardware can’t handle that load, nothing else matters.

The Glenn HD is built for mantels 3½” or thicker and up to 14” deep. Each 1” OD hollow steel rod is rated at 300 lbs when properly anchored into studs or structural posts. Because load capacity scales with rod count, longer mantels get more rods — and proportionally more capacity.

Glenn HD bar lengths and capacities

• 46” bar — 3 rods — 900 lbs — for mantels 48”–60”
• 58” bar — 4 rods — 1,200 lbs — for mantels 60”–72”
• 70” bar — 5 rods — 1,500 lbs — for mantels 72”–80”
• 78” bar — 5 rods — 1,500 lbs — for mantels 80”–96”

The back bar is ¼” hot-rolled American steel — 70% recycled content, designed and engineered in the US. Fastener holes run 1” OC from each end and 4” OC down the bar length, giving you consistent anchoring points across the full span. Rods are positioned 2” in from bar ends.

If your mantel runs shallower than 7”, custom rod lengths are available. Order rods 1½” shorter than your actual mantel depth.

Patent pending design.  Download HD Spec Sheet

Glenn MD — For Standard-Profile Mantels

Not every mantel is a reclaimed 6×8 beam. A lot of them are built-up lumber — solid wood mantels in the 2¼”–3¼” thickness range that don’t need the larger rod diameter of the HD, and don’t have the depth to accommodate it.

The Glenn MD uses ¾” OD hollow steel rods, each rated at 200 lbs when installed into studs. The back bar is the same ¼” hot-rolled American steel as the HD — same recycled content, same US design — but the rod diameter is sized specifically for standard-profile mantels. Trying to fit 1” HD rods into a thinner mantel leaves you with insufficient wood around each rod. The MD solves that.

Glenn MD bar lengths and capacities

• 46” bar — 3 rods — 600 lbs — for mantels 48”–60”
• 58” bar — 4 rods — 800 lbs — for mantels 60”–72”
• 70” bar — 5 rods — 1,000 lbs — for mantels 72”–80”
• 78” bar — 5 rods — 1,000 lbs — for mantels 80”–96”

Mantel depth range for the MD is 7”–10”. If your mantel is deeper than 10” and thinner than 3½”, contact us — you may be at a crossover point where a custom configuration makes sense.

Patent pending design.  Download MD Spec Sheet

What You Need to Know Before You Buy

Measure your mantel first

You need three numbers: thickness, depth (wall to face), and length. Thickness determines whether you need the HD or MD. Depth determines which rod length to order. Length determines which bar size you need.

The wall matters as much as the mantel

Both the Glenn HD and Glenn MD require solid backing — wood studs, a structural post, or masonry. If your fireplace surround is all drywall with no framing behind it, these brackets can’t be safely installed until you address the backing. This isn’t a limitation of the hardware; it’s how load-bearing wall attachment works.

Brick and masonry installation is possible, but more involved

Wall anchor sets and masonry anchors are included with every Glenn System order — predrill each location with a ¼” drill bit (Toggler brand anchors give the best results), and plan for a fastener and anchor every 4–6 inches in masonry and drywall spans. The drilling is more demanding than stud installation. When in doubt, contact us or work with a contractor who has masonry experience.

Mantels shallower than 7” need custom rods

Standard rod lengths assume a minimum 7” mantel depth. If yours is shallower, order custom rods — 1½” shorter than your actual mantel depth. Both systems support this.

Non-combustible clearance requirements apply

Per standard building code (IRC R1001.11), combustible mantels must sit at least 12” above the firebox opening, and combustible material within 12” of the opening cannot project more than ⅛” for each 1” of distance from that opening. Your local building code, the fireplace manufacturer’s documentation, or the mantel material itself may impose additional requirements. These are not bracket requirements — they apply to the mantel installation overall. Check before you set your mounting height.

DIY installation is realistic with the right tools and solid wall backing

You’ll need a drill capable of reaching studs, a level, and the patience to locate framing accurately. Both systems include step-by-step install guides. If you’re uncertain about your wall backing or this is your first structural wall installation, a contractor consult is worth the time.

Floating Mantel Brackets FAQ