Posted by s.shabbir · June 19th 2025
When it comes to composite doors, what’s inside matters just as much as what’s outside. While choosing a Rockdoor, you’re not just getting a stylish front door, you’re investing in a door manufactured through cutting-edge engineering designed to protect your home for decades.
One of the hidden elements that makes this possible is our rigid PVC-U inner frame. While it may not be visible, this crucial component is key to the strength, energy efficiency, and overall performance that set Rockdoor apart.
Why PVC-U Over Timber?
Unlike many composite doors on the market that still rely on traditional timber frames, Rockdoor uses rigid PVC-U profiles integrated with aluminium-reinforced frames and for good reason. Timber can absorb moisture over time, resulting in warping, rot, and swelling. Such deterioration compromises the performance of a door and can impact various aspects, including thermal efficiency and security.
PVC-U, on the other hand, is completely impervious to moisture. It won’t warp, rot, or swell, even after years of exposure to the unpredictable British weather. This ensures that your Rockdoor will remain stable, secure, and energy efficient throughout its lifetime.
Built for Strength and Security
Every Rockdoor is custom-made to fit, not trimmed down from a generic blank. This allows us to insert a bonded PVC-U inner frame reinforced with a full aluminium box section that wraps around the entire frame of the door. The result? Unmatched strength and security, regardless of your door’s size.
This combination of materials also means the door maintains its structural integrity without compromise, providing protection and peace of mind for you and your family. That’s just one of the many reasons Rockdoor composite doors are accredited by Secured by Design, the official police-backed security initiative.
Engineered for Energy Efficiency and Performance
Because our PVC-U inner frame doesn’t deteriorate over time like timber can, it plays a vital role in maintaining the exceptional thermal performance Rockdoors are known for. With higher energy ratings, you’ll benefit from lower energy bills and a more comfortable home all year round.
The PVC-U inner frame is just one of the many elements that make a Rockdoor stronger, safer, and smarter than the rest. It’s these kinds of details that make our composite doors a reliable choice for thousands of homeowners across the UK.
But we didn’t stop at simply using PVC-U. Our inner frame includes a unique design feature: a leading edge on the vertical lock side of the door. It may seem like a small detail, but it makes a big difference to the overall experience. This enhancement improves the way the door opens and closes, providing a smoother, more subtle feel that you notice every day.
Looking to upgrade your front door? Explore our range of door styles and find the perfect match for your personal taste.
