Installing mortice locks on double rebated doors might appear challenging, but with proper guidance and the right tools, it’s a straightforward task for any skilled trade professional.

Rebated doors, commonly used for external applications, feature an overlapping edge known as a rebate. This design enhances weather protection and security but requires specific considerations when fitting locks.

In this guide, we will explore the steps involved in fitting mortice locks and the necessary use of rebate kits. This comprehensive overview will help you ensure a secure and compliant installation, especially when dealing with British Standard BS3621 locks.

Understanding Rebated Doors and the Importance of Rebate Kits

Rebated doors have a unique stepped edge where one door overlaps the other, creating a tight seal against the elements. The depth of this overlap, or rebate, is crucial when fitting mortice locks, as it affects the installation process. Standard rebate sizes include 13mm, 19mm, and 25mm, with 13mm being the most frequently used.

When installing mortice locks on rebated doors, it’s essential to use a rebate kit. These kits bridge the gap caused by the rebate, allowing the lock to function correctly and maintaining door security. It’s important to note that rebate kits are not universal; each lock series may require a specific kit, often available in different colours to match the lock’s faceplate.

Selecting the Right Mortice Locks and Rebate Kits

Mortice locks and rebate kits are integral to the security and functionality of rebated doors. When selecting these components, ensure compatibility between the lock and the rebate kit. This is crucial for seamless installation and optimal performance.

For internal rebated doors, rebate kits are also available for tubular latches, digital door locks, and non-BS mortice locks. Some locks and latches for internal doors come pre-rebated, which simplifies the installation process.

Mortice locks can be fitted to a pair of rebated doors. A pair of rebated external wooden doors will have an overlap to help provide weather protection, this overlap (or rebate) is made in 3 sizes; 13mm,19mm, and 25mm.

The most common size is 13mm with 19mm and 25mm rarely used now.

When fitting a dead or sash lock to rebated doors this overlap will prevent the usual method of installing thus requiring the use of a rebate kit that will sit behind the lock bridging the gap to allow installation.

To determine the size of the rebate you require; simply measure the depth of the overlap between the two doors.

Rebate kits are not universal and each series of lock would have its own designated rebate kit which will be available in different colours to match the faceplate of your lock.

Key Considerations for Using Rebate Kits with BS3621 Mortice Locks

For external rebated doors, installing a BS3621 mortice lock is often required for insurance purposes. However, the use of a rebate kit will invalidate the BS3621 certification, as the standard installation method is altered.

Important Notice: When using a rebate kit with a BS3621 mortice lock, it’s crucial that the end user inform their insurance company. This ensures the deviation from the standard installation method is recorded on their policy, maintaining compliance and coverage.

Installing Mortice Locks and Rebate Kits

1. Measure the Rebate Size

  • Accurately measure the depth of the rebate to determine the correct size for the rebate kit.
  • Select the appropriate rebate kit based on your measurements.

2. Choose Compatible Mortice Locks and Rebate Kits

  • Select mortice locks suitable for your specific door type and ensure they are compatible with the chosen rebate kit.

3. Prepare the Door

  • Mark the positions for the mortice lock and rebate kit components.
  • Use precise tools to create the necessary cavities, ensuring a proper fit.

4. Install the Rebate Kit

  • Fit the rebate kit securely into the prepared cavity, aligning it with the lock mechanism.

5. Fit the Mortice Lock

  • Install the mortice lock into the door, ensuring it integrates seamlessly with the rebate kit.

6. Test and Adjust

Make any necessary adjustments to ensure the doors close properly and the lock engages securely.

Test the lock mechanism to ensure smooth operation.