Frequently Asked Questions


We’ve heard it all before…

Being in the door and frame industry in New Orleans since 1986, we’ve answered a lot of questions about doors!

Consulting with a B&M Door Specialist not only gives you the answers you need, but it also allows us to fully understand your project. By asking questions, we can uncover potential issues that could cause you problems later on down the line. When we know your end goals, we can ensure you get the right materials and know how to use them.

We professionally install every product we sell.  If you’ve ever hung a door, you know no two installations are ever the same.   Unexpected problems caused by improper framing, un-level floors or a wall that isn’t plumb can bring a project to a grinding halt.

Click a question below…
What is a hardware schedule and why is it important?

The hardware schedule is used by architects to indicate the specs for the design, grade, function, size, and other distinctive qualities for the hardware to be used in new or renovated facilities. The hardware schedule is important because it establishes the minimum requirements needed for the hardware based on a referenced manufacturer.

What’s the difference between a left hand and right hand door? What’s a reverse hand door?

Left and Right Hand Doors swing into a room. A Reverse Left or Right Hand Door swings outward.

Are all metal doors created the same? How about the hardware?

Not all metal doors are created equal. Some metal doors are cold-rolled while others are galvanized or galvannealed. Metal doors also come in a variety of thicknesses or “gauge”. Hardware for commercial use is broken down into Grade 1 or Grade 2. The grade is defined by the number of cycles the hardware can withstand.

What gauge doors and frames does B&M carry?

We stock 16 gauge frames and 18 gauge doors, but can supply any gauge you need for your project.

What is cold-rolled steel? What is the difference between galvanized and galvannealed?

Cold-rolled steel is fed through rollers that reduce the thickness while also adding strength. This process manufactures the steel at a temperature below its recrystallization point so the steel will not shrink, change form, or appearance. Cold-rolled doors and frames have a smoother finish and more accurate dimensions than hot-rolled steel. Cold-rolled hollow metal doors and frames are usually preferred when appearance is an important factor.

Galvanized doors and frames are protected by submerging the steel into molten zinc. This coating gives the steel added protection from corrosive environments. Galvannealed doors and frames are galvanized then heated after the zinc coating is applied. Heating the steel post-coating allows more iron within the steel to surface and mix with the zinc, thus making it stronger.  This coating is better for welding, bonds better with paint, and does not require a primer. Galvanization produces a rougher appearance than that of cold-rolled counterparts.

Are there different types of galvanized doors?

Yes. B&M supplies both A60 galvanized steel and G90 galvanized steel doors and frames. A60 galvanization means there is .60 ounces of galvannealed coating per square foot which is ideal for all steel doors and frames. G90 is an extremely heavy coating with a rough appearance that often cannot be concealed by paint. G90 should be used in harsh, corrosive environments like pool facilities.

Why are most doors in New Orleans area rusted at the bottom?

In South Louisiana, doors are constantly exposed to salt air. To combat the corrosive environment of the Gulf South, use galvannealed steel doors and frames fabricated from carbon steel sheets that have been coated with zinc on the two sides by the continuous hot-dip process and then heat treated. Proper DTM (Direct to Metal) paint can also help mediate rust problems on doors.

What does “Division 8” mean?

Division 8 is architectural jargon for door, window, and hardware specs. Architects organize plans into a CSI (Construction Specifications Institute) method utilizing Divisions that categorize the drawing notes into subsections. Division 8 is the section of the specification that refers to doors, windows and hardware. A note “8-2243” may refer to a window or door component, because Division 8 means Doors & Windows.

What is the difference in fire ratings?

A fire door is a door with a fire resistance rating, often referred to as a fire protection rating for closures. The fire rating classification of the wall in which the door is installed actually dictates the door’s required fire rating. The fire rating is used as part of a system to reduce the spread of fire or smoke between compartments and to enable safe egress from a building. The fire rating for steel doors is typically rated by time (in minutes or hours) that a door can endure fire conditions. Ratings range from 1/3 hour to maximum of 3 hours.

Does the door I buy from B&M have a warranty?

Yes. Our manufacturer Mesker Door Inc. offers a one (1) year warranty from the date of shipment on all material manufactured to be free from defects in workmanship under normal use and service.

What is an acceptable gap between leaves on a pair of exterior metal doors?

The clearance between the door and frame shall be a maximum of 1/8″ for both single swing and pairs of doors. Refer to section 2.1.8 in A250.8 for clearances for meeting edges and undercuts for non-rated and fire rated applications.

Since these are exterior doors, an open gap is not recommended and weatherstripping should be provided to seal the perimeter and meeting edge of the opening.

How do I know if I need a welded frame or knock down frame?

Welded frames are used in new construction and are installed prior to walls. A knock down frame is used for any preexisting opening.

How is the frame anchored?

Welded frames are first attached to the floor, then are anchored after walls are built to it, with anchors specially designed for wood stud, metal stud, or CMU walls.

Knock down frames are anchored at the top of the opening using a compression anchor at the top of each jamb. The frame is then anchored to the stud at the bottom of each jamb with the drywall strap or screw base anchor. The frame is also anchored to the stud at the center location with the drywall strap. Masonry knock down frames utilize anchor designed specifically for wood or metal studs or CMU walls. Dry wall knock down frames anchor with drywall screws.

Have questions about your commercial new construction or renovation project? Contact us today!