Heavy Duty, High Sound, Automatic Door Bottom, Mortised

Heavy Duty, High Sound, Automatic Door Bottom, Mortised

Automatic Door Bottom with highest sound control properties.

Fully Mortised High Sound Control Rated, Heavy Duty, Automatic Door Bottom with high quality double neoprene seal, which fills gaps up to 1". Available in aluminum mill finish in standard stock sizes (Can also be trimmed on the field).

Special Discounts apply to orders over $500.00! See Product Descriptions for details.

Price: $104.74
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Made in USA
Fast turnaround

This “High Sound” Heavy Duty, Fully Mortised Automatic Door Bottom is designed to provide the ultimate in sound reduction. The aluminum casing is fitted with a double self-extinguishing and oil resistant solid neoprene insert (see detailed images), which ensure maximum sound control properties.

This product is designed to be fully mortised into a wooden door and requires a cutout of .924” x 1.575”. Mortised door bottoms offer better sound control than surface mounted as they can fill the complete length of the door. They are also great for designer doors and high end luxury condos, since the appearance of the door is not altered. It is non-handed (will work with both a right and left handed door) and can be applied directly over the floor surface or above a doorway saddle, though a saddle is recommended for higher sound control (A saddle is necessary also when the door bottom is sealing onto carpet). Available in aluminum mill finish and stanard stock sizes.

Screws and end plated are provided with your purchase. For installation instruction you can print our installation guide by clicking on the "installation guide" tab to your right.

Not sure what size you need? See How to Measure for an Automatic Door Bottom.

Custom Sizing: Custom sizes up to 54" can be purcashed through our office. Please contact us at 845-388-1200.

How it Works:

This product utilizes a concealed flat mechanism which is activated by the pressure of closing the door (The brass nut at the head gets pushed in by the door jamb and that lowers the seal).  The high quality neoprene rubber seal drops, filling gaps up to 1”, upon the closing of door to create a tight seal and raises automatically when the door is opened to ensure smooth door operation. Our door bottoms have been tested through 5 million open and closing of a door so that you are ensured a high quality long lasting product. For more information, see About Automatic Door Bottoms.

Automatic Door bottom can be trimmed on the field up to 3-4" depending on the size ordered, see installation guide tab.

Note: We recommend trying to keep the gap between the door and the floor at no more than 3/8" for maximum sound sealing. Larger gaps can be treated with a doorway saddle, or an added wood strip to the underside of the door.

Special Discounts on Our Door Hardware:

No Coupon Code Needed. Discount automatically applied when added to shopping cart.

Spend $500.00, get 5% off plus free shipping
Spend $1000.00, get 10% off plus free shipping

See our Monthy Specials and Discounts for more great Soundproofing Savings!

Please note, images are for illustrative purposes only. They are not actual photos. Therefore, actual colors may vary slightly and size may be enlarged to show detail. See product specs for exact measurements.

Product Data
Installation Guide

Click here for a Printable Copy of How to Install an Automatic Door Bottom.

Automatic Door Bottoms are available with three mounting options: Surface Mounted, Semi-Mortised and Fully Mortised. A surface mounted application can be applied without removing the door from its hinges. For a semi-mortised, if the rabbet in the door is cut-out already, the door does not need to be removed. For a fully mortised application the door should be removed before starting.


  Once your door is ready for installation you need to determine the size required for your door bottom:
  • For a Surface Mounted Application: Measure the distance between the two stop moldings, or if a perimeter door gasket is applied,
    measure the distance between the two installed gaskets, then minus 1/8-1/4"” (.125”) from the total distance. That is the size needed for your door bottom.
  • For a Semi-Mortised and Fully Mortised Application: Measure your door from side to side; that is the measurement needed for your automatic door bottom.
For visual presentation see How to Measure for an Automatic Door Bottom.
How to Install an Automatic Door Bottom- Figure 1

Once you have determined the size needed, if necessary, trim your door bottom.
Use a chop saw or table saw to create a perfectly straight cut.

Note, Only trim opposite the actuating plunger, brass nut. (Trimming from the brass nut side will ruin your ADB).

How to Install an Automatic Door Bottom- Figure 1 You can trim from the edge up to one inch of the screw in the side wall of the ADB.  


How to Install an Automatic Door Bottom- Figure 3

Surface Mounted and Semi-Mortised models need to be applied to the push side of the door only (the side with the door stops-see Figure 3).
The actuating plunger needs to be applied to the hinge side of the door for all applications.

Place the automatic door bottom against the door

Once you have the automatic door bottom leveled and positioned correctly, with a pencil or marker mark
where the attachment screws need to be drilled.



How to Install an Automatic Door Bottom- Figure 4

To make installation easier you can drill a pilot hole which will ensure you attach the door bottom to the correctly marked spot (see Figure 4).
With the screws provided, screw in the automatic door bottom.

In some models, a plate is provided for the hinge side of the frame. This will protect the door frame from getting worn down by
the actuating plunger. If provided, attach to corresponding point on the frame.



How to Install an Automatic Door Bottom- Figure 1

Now that the door bottom is attached, test the door bottom by opening and closing the door to ensure there is a full seal.
If the seal does not come down far enough twist the brass nut out, if it seals too tight twist the brass nut in (see Figure 5).


Once you have followed through with all the instructions your Automatic Door Bottom is good to go! Enjoy years of quality sound, draft and light infiltration control with your new door bottom.

For additional assistance and product information, feel free to contact us. Our trained and friendly staff will guide you with all your soundproofing needs.

Shipping & Returns

Shipping and Return information is specific to this product page only (not for other products on our site).

  • Shipping:
    • Standard stock sizes (available above) ship with 1 business day.
    • For custom sizes ordered through our office, please allow 7-14 business days to ship.
    • FREE SHIPPING on orders over $75.00. There will be a flat $14.99 shipping and handling fee on orders under $75.00. - Applies to orders shipped within the USA (excluding Alaska and Hawaii).
    • Ships FedEx Ground.
  • Returns:
    • Product can be returned if in brand new condition, up to 30 days from date of purchase.
    • Please call or email us to receive an RMA number before returning. No returns will be processed without an RMA number.
    • Return shipping is customer's responsibility. Return address will be provided along with RMA number.
    • If you are shipping via USPS (not recommended) do NOT require signature as we will not be able to pick up your package from local post office facility.
    • Click here for more information on our Return Policy.

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Product reviews are only available to verified buyers of this product. To leave a review, please refer to the product review email we sent you.
  • Attractive (1)
  • Heavy Duty (1)
  • Difficult To Install (1)
best uses
  • Interior Doors (1)

Reviewed by 1 customers

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By MCC, Inc

from Santa Clara CA

About Me Professional

Verified buyer
great product
  • Attractive
  • Heavy Duty
  • Difficult To Install
best uses
  • Interior Doors
Comments about Heavy Duty, High Sound, Automatic Door Bottom, Mortised:
We use these for bathroom doors in common areas and for home theaters. they are aboout as good as it gets. totally invisible.
Bottom Line Yes, I would recommend this to a friend
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Customers Questions and Answers

1) Dean : Do you ship to Canada?

Trademark Soundproofing Reply: Yes we do.

2) todd m: Does the floor have to be level for this to work properly? I am running to issue with only partial seal because floor isn't level.

Trademark Soundproofing Reply: Hi Todd, If it is uneven in a straight line the Automatic door bottom will self adjust. If it is "U" shaped it would not perform at it's best.

3) Mark P: I am trying to figure out if the 32" long "heavy duty high sound automatic door bottom mortised" can be trimmed down to 30" I found this in the installation info. "You can trim from the edge up to one inch of the screw on the side wall of the ADB (see Figure 3)." Not knowing the location of that side wall screw, I don't know if trimming down to 30" would be possible or not. Thanks, Mark

Trademark Soundproofing Reply: Hi Mark, Yes that can be trimmed to 30 inches. There is aboit 4 inches of trim room on that ADB.

4) Peter: What is the minimum door thickness for mortise application?

Trademark Soundproofing Reply:

See the specs here http://www.tmsoundproofing.com/products/ADB/369/369specs.pdf

We have a narrower model here http://www.tmsoundproofing.com/products/ADB/350/350specs.pdf

5) Robbie T: Looking for something like this for my theater solid core door. Who is the manufacturer of this product? Thanks, Robbie

Trademark Soundproofing Reply: Hi Robbie. These are manufactured for Trademark Soundproofing. Made in USA with testing to over 5 million opening and closings.

6) Dave O: How can I lessen the plunger force required to actuate the rubber seal? I am installing this in a powered pocket door and do not want to use magnets to get the required holding force.

Trademark Soundproofing Reply: That cannot be done. We do have an option for a model with a low force plunger (you can call the office to request it) for pocket doors. However that too would require magnets/latch for it to work.

7) Haytham : I am thinking of this automatic door sweep for several of my doors. the one that is an issue is the front door which measures 57 inches in length. the longest size you available for the sweep is 36 inches. how can I make it work?

Trademark Soundproofing Reply: Hi. We can do a custom size for you up to 60 inches. Please give us a call 845-388-1200 to order.

8) James R: If I order the 36" Heavy Duty. High Sound, Automatic Door bottom (mortised), can it be trimmed down to 32"? My door is 32 wide and I want to make sure 4" can be cut off of the door bottom.

Trademark Soundproofing Reply: Hi James. You can actually use the drop down on the product page to choose a 32" length for this item.

9) Ed W: Is this the same door bottom as the old tm963A number? Thank you, Ed

Trademark Soundproofing Reply: Yes it is.

10) Kam: Is there a minimum distance from the bottom of the door to the floor needed for this to work? If so, what is the minimum distance?

Trademark Soundproofing Reply: If the door swings open or close there should be enough clearance for an ADB to work.