Rockdoor Technical FAQs

Each and every Rockdoor is made bespoke to your requirements, ensuring it fits your home perfectly maximising the security and thermal efficiency levels of the door. For that reason, minimum and maximum door sizes vary depending on the door style.

Door styles with larger pieces of glass, such as the Windsor and Classic, are limited by how narrow they can be made due to the glass unit. Whereas doors with narrow pieces of glass, such as the Cottage Spy View, can fit nicely into smaller door apertures.

Most doors in the UK are built to similar sized door apertures, so if you’re just looking for a standalone door, a Rockdoor should comfortably fit.

For large door apertures, size can always be added to the side of the doors, or head of the door, by using frame extensions or side frames which is a popular choice.

View our Rockdoor technical manual to see minimum and maximum door sizes by style.

Both of our standard and slimline thresholds are extremely thermally efficient and will provide a fantastic barrier to keep energy inside your home. Although the slimline threshold is technically the most efficient, there is actually very little separating the two.

Our A rated Rockdoors can be easily achieved with either of our standard or slimline thresholds when combined with other factors that will improve the thermal performance, such as clear backing glass.

Low aluminium thresholds can also achieve a Door Set Energy Rating of between A-C and are great for pram and wheelchair access due to their low 15mm incline – ask your local installer for more details.

Although Rockdoors are designed to give you the classic aesthetics and feel of a timber entrance door, you may be shocked to hear that there is no wood used in any part of a Rockdoor!

At Rockdoor, we recognise that timber is not the solution if you want an entrance door that will truly stand the test of time. Therefore, all our composite doors consist of two woodgrain embossed uPVC skins on the outside, which form the exterior and interior of the doors, which are then filled with a high density, Polyurethane Foam core to keep your home secure and extremely thermally efficient, whilst withstanding the busy lifestyle so many of our customers have.

The problem with full timber and even composite doors that contain timber is that they are more likely to expand and swell in the heat, which can permanently damage the structure of the door resulting in a door that will not close, or a door that could potentially become weakened resulting in lower than average security levels.

All composite doors, no matter the material, are prone to movement through expansion and contraction of the materials used, particularly if the door is south facing. Timber is especially problematic when used in doors.

Rockdoors latest technology using an Aluminium innerframe that runs the full perimeter of the door, ensures movement is vastly restricted. Whilst we can’t fully stop the door moving, (no door company can claim this), we do offer a 3mm no bow guarantee. This means if your door bows by more than 3mm, then our guarantee covers a replacement. When you consider what 3mm equates to in real terms, this is the actual thickness of a £1 coin, so exceptionally small overall.  

It’s important to note, all Rockdoors are designed to accommodate a slight bow whilst still allowing for perfect operation. The frame, gaskets and lock mechanisms ensure the door performs as expected as it’s factored into the design process.

It’s important that homeowners do not adjust doors as it could result in a small issue that is easily rectified by a competent Rockdoor installer, becoming a bigger issue.

Rockdoor Trusted Installers are trained to adjust doors where required to move the door slightly or adjust the compression on the Q-lon weather gasket.

Due to our S-Glaze technology, the glass unit in a Rockdoor is sealed in. This benefits your home because it provides an extra layer of security, removes the potential for draughts entering your home via the glazing, and increases the thermal efficiency as a result.

Although the glazing cannot be replaced in the door’s lifetime, there is very little chance it will ever need replacing, as Rockdoor uses toughened glass as standard, which is extremely durable.

For more details on how the glass is forever encapsulated into your door, our S-Glaze information page has more details.

Secured by Design (SBD) is an official police security initiative that provides a recognised standard for security products, including front doors and back doors.

You can learn more about the benefits of this accreditation on our Secured by Design page.

PAS24 is a security standard that can only be achieved when a set of security tests are passed. Achieving PAS24 means your exterior doors are protected against the threat of breaking an entry.

More details about our PAS24 registration can be found on pages 64 & 65 of our technical manual.