Heavy Duty Automatic Door Bottom - Mortised

Heavy Duty Automatic Door Bottom - Mortised

Fully Mortised Heavy Duty Soundproof Automatic Door Bottom with high quality solid neoprene bulb seal, 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: $82.59
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Made in USA
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This Heavy Duty Soundproof, Fully Mortised Automatic Door Bottom will provide an excellent seal needed to retain your door's sound rating. The aluminum casing is fitted with a self-extinguishing and oil resistant solid neoprene insert which serves as its primary seal. Solid Neoprene has high sound control properties and is very durable. It will hold up longer over the years and should be used when applied to high frequency traffic or rough floor surfaces, such as concrete. Additionally, the interior of the aluminum anodized casing is filled with anti-squeak rubber for extra protection and to ensure smooth operation.

This product is designed to be fully mortised into a wooden door. It is great for designer doors and high end, luxury condos, since the appearance of the door is not altered. It is non-handed 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 highly recommended also when the door bottom is sealing onto carpet). Available in aluminum mill finish and in standard stock sizes. Installation instructions and screws provided.

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

Custom Sizing: Custom sizes up to 60" can be purchased 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 up automatically when the door is opened to ensure smooth door operation. Our door bottoms have been tested through 5 million cycles and provide the same excellent quality as our surface mounted and semi-mortised automatic door bottom. 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 door 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.

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 within 1 business day.
    • For stock 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 in brand new conditions 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 to 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.
  • very good concept (1)
  • Attractive (1)
  • Effective (1)
  • Great Overall Soundproofing (1)
  • Versatile (1)
  • very poor directions (1)
best uses
  • Paper weight (1)
  • Door seal (1)

Reviewed by 2 customers

Displaying reviews 1-2

By Skier

from Wenatchee, WA

About Me Professional carpenter, builder, remodeler

Verified buyer
  • very good concept
  • very poor directions
best uses
  • Paper weight
Comments about Heavy Duty Automatic Door Bottom - Mortised:
The intended application was to seal the bottom of an exterior door. The climate of the location exceeds 100 degrees f (38 degrees C.) in the summer with temperatures below 0 degrees f (-16 degrees C.) for an equal amount of time in the winters. Sweep style seals quickly wear to the point of limited usefulness in one season in most cases. This concept of an adjustable seal that extends to create the seal only when the door is closed is an excellent concept, however with the device purchased the manufacture and execution of the concept is severely lacking. When the device arrived and was removed from the box a part fell out of the device. I was able to figure out how to remove the mechanical working parts from the channel frame to attempt to put the part back in the right place. I was most surprised to find the interior of the channel frame as well as the working parts covered with shavings of aluminum debris secondary to the manufacturing process. I cleaned it all up, and noticed a part similar to but longer than the part that fell out. It was mounted in the working parts, a pad of sorts in an upper channel (to reduce rattling of the actuating rod mechanism?). I sent an email and called to find out how/where to reinstall the part. After a week of waiting for a reply I had to install the part as it had been trimmed a couple of mm to fit. Those of you installing such a device in a door be sure to measure the height of the device and cut the mortise exactly that dimension, do not allow any space at all. There are NO instructions for the installation of the aluminum end covers, but you must leave as much material above the device to install the end covers on both ends of the device. If you can, cut the mortise to match the stepped shape of the top of the device to provide more support for the screws to mount the end covers. continued . . .
Images by customer

By Vanman

from Florida

Verified buyer
  • Attractive
  • Effective
  • Great Overall Soundproofing
  • Versatile
best uses
  • Door seal
Comments about Heavy Duty Automatic Door Bottom - Mortised:
I have a floor that drops 1 inch in a 36" approach. So, either I had to install a fixed floor threshold that would alter the beautiful marble flooring, or use this adjustable door seal. I worked out great. The only issue(s) I had was the quality of the door. The door was a mixture of composite, wood and cardboard fillers, so when you router the groove in the bottom of the door a lot of chunks and pieces start flying. But once the adjustable door seal is installed it becomes a clean finished look (even though you can't see it on the bottom of the door).
Bottom Line Yes, I would recommend this to a friend
Displaying reviews 1-2
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Customers Questions and Answers

1) Ed : Is there a "end-plate" that covers the end with the adjustment screw?

Trademark Soundproofing Reply: Hi Ed, Yes end plates are provided. There is a hole in the end plate for the adjustment screw as it needs to protrude for proper functioning of the automatic door bottom. In general if not really necessary we recommend not using the end plates as they can get loose and caught at the edge of the frame.

2) miti: Can you let us know what is the max. length of this material

Trademark Soundproofing Reply: Hi Miti. 60 inches is the longest.

3) jennifer: Our door is 24". Can we cut the 32" door bottom down to this size?

Trademark Soundproofing Reply: No. Please contact our office and we will have one custom cut to size for you. Production time is approx 10 business days

4) Greg: what is the overall width of the unit, will it work for a 1-3/8" thick door Thank you Greg

Trademark Soundproofing Reply:

Hi Greg. You can see the specs on the "Product data" tab on the page. Here is a link https://www.tmsoundproofing.com/products/ADB/364/364specs.pdf This one is meant for a door that is minimum 1-3/4" thick. For your door try this one https://www.tmsoundproofing.com/Automatic-Sound-Rated-Door-Bottom-Mortised.html

5) Justin M: So I am interested in buying the DSZ364A32 for several doors. But I have a couple with a 1.5' gap. Do you have a product that will fill that gap? Thanks Justin

Trademark Soundproofing Reply: Hi Justin. You can add furring to the bottom of the door or a saddle to the floor. For optimal performance we recommend keeping the gap to within half an inch.

6) Lisa: Can this item be cut down to 30"?

Trademark Soundproofing Reply: The 32 inch one can be cut down to 30 inches.

7) Bob: I live in New Hampshire (lots of ice and snow!). Is this unit suitable for an exterior door?

Trademark Soundproofing Reply: Yes. It can be used in outdoor elements as well.

8) AARON S: What is minimum thickness of door you need to use this product? Or in other words after the trough is cut how much wood needs to be on either side of the trough to keep the door from cracking?

Trademark Soundproofing Reply: 1-3/4" door for this model

9) Julia: Is there are charge for custom cut length?

Trademark Soundproofing Reply: No. Just an extended lead time.