The Hidden Layers of Your New Build: Why Cladding Defects Matter

If you've ever stood across the street from a modern block of flats or a new build estate and admired the sleek panels, render finishes, or expanses of glass that wrap around the building, you've been looking at curtain walling and cladding. These outer skins are far more than aesthetic choices. They shield your home from wind and rain, hold in heat, and contribute hugely to how your property performs over its lifetime. Yet when something is wrong behind that finish, you'd rarely know just by looking.

For buyers of new build homes, understanding what should be happening behind the cladding can make a real difference when problems eventually surface. Here's a guide to what these systems do, what can go wrong, and why an independent inspection is one of the best investments you can make before the keys change hands.

What is curtain walling and cladding?

Curtain walling is a non load-bearing outer enclosure, usually made up of framed glazing and panels, that hangs on the front of a building. It carries only its own weight along with the pressures of wind, water, and sun. You'll see it most often on apartment blocks, mixed-use developments, and contemporary houses with large glazed elevations.

Cladding refers more broadly to the layered systems used to face the outside of a property. Four main types appear on modern new builds. Curtain walling, as described above, is the first. Rainscreen cladding uses an outer skin of panels with deliberately open or rebated joints, sitting in front of a pressure-equalised air gap and an insulated backing wall. Insulated render systems involve fixing an insulation layer to the backing wall and finishing it with a rendered coat. Brick slip cladding bonds thin brick facings onto a carrier system attached to the backing wall, giving the appearance of traditional brickwork without the weight.

Each system has its own quirks, but they share the same goals: keeping water out, keeping warmth in, and lasting for decades without intrusive repairs.

What good cladding work looks like

A well-designed and properly installed cladding system relies on dozens of small details being correct. Fixings need to be made from the right corrosion-resistant materials, with the correct spacing, embedding, and torque. Dissimilar metals should be separated to prevent bimetallic corrosion, and aluminium components shouldn't sit in direct contact with cementitious surfaces. Insulation needs to be neatly cut around fixings, returned into door and window openings, and held in place with the right number of non-combustible fixings.

Damp proofing is another area where care matters enormously. Cavity trays with stop ends should sit at the base of the system, above openings, and at any interruption to the cavity. Sealants and tapes should follow the design and never be relied upon as the sole barrier against water. Breather membranes need to be continuous and durable, particularly behind rainscreen panels with open joints.

For rainscreen systems specifically, the air gap behind the panels needs to be the right width. A minimum of 50mm should sit behind open joints, or 38mm behind baffled or labyrinth joints, with the joints themselves at least 10mm wide. The cavity must also be compartmented with horizontal closers at every floor level and vertical closers at appropriate centres, particularly near corners. This compartmentation is what creates the pressure equalisation that keeps wind-driven rain out of the wall.

Common defects in cladding and curtain walling

Even on developments with reputable builders, defects in cladding work crop up with worrying regularity. Insulation is often poorly cut, leaving gaps, cold spots, and the risk of interstitial condensation forming inside the wall. Cavity barriers can be missing or incorrectly installed, which compromises compartmentation and undermines fire and smoke control. Sealants are sometimes applied as the only line of defence at interfaces, rather than as a supplement to proper damp-proofing details.

Fixings frequently turn out to be the wrong material, the wrong spacing, or installed at the wrong torque. Open joints can be too narrow, or air gaps too tight, preventing the pressure equalisation that keeps rainscreen systems dry. Breather membranes behind open-jointed panels are sometimes damaged or missing altogether. Render is occasionally applied to surfaces that haven't been properly prepared, or without the additional reinforcement mesh needed around window and door corners. Brick slips are often set out poorly, leading to excessive cutting at corners and openings, or coursing that doesn't line up with lintel heights.

Many of these problems can only be spotted by someone who knows what they're looking for. A few, like thermal bridging or hidden gaps in insulation, may only show up with thermal imaging or intrusive inspections.

Why an independent snagging inspection matters

When you buy a new build, you're trusting that the developer has installed every component to the design and to the relevant industry guidance. The reality is that the average new home contains in excess of 140 defects, and cladding work is one of the areas where corners are most easily cut. Once the outer skin is on, much of the work behind it becomes invisible. Defects may only show themselves as cold rooms, damp patches, mould, or rising heating bills months or years later.

A Brickkickers snagging inspection gives you an independent, written record of issues, complete with photographs, that you can hand to your builder for rectification under your warranty. Our inspectors check both the interior and exterior of the property, including the visible elements of cladding and render work. Thermal imaging is included as standard, and it's particularly useful for cladding work because it can reveal cold spots, missing insulation, water ingress behind panels, and faults in heating systems that the naked eye would never pick up.

We can carry out a Pre-Completion Inspection before you legally take ownership, giving you leverage to have problems sorted before you move in. We can also carry out a standard snagging inspection after you've moved in, helping you raise defects under the terms of your warranty, which typically allows you to report issues within the first two years of occupation.

For unusual or persistent problems, such as a room that just won't warm up, or a dispute with your builder about whether work has been done properly, we offer Customised and Intrusive Building Surveys. These go beyond what a non-invasive inspection can pick up, opening up parts of the property where necessary to identify the cause of an issue and recommend a fix.

A small investment for considerable peace of mind

Cladding and curtain walling are among the most complex elements of a modern home, and they're the parts most likely to hide expensive, hard-to-fix problems. Bringing in an independent expert before or shortly after completion isn't a vote of no confidence in your builder. It's a sensible step that protects what is, for most people, the largest purchase they'll ever make.

If you're approaching the completion of a new build, or you've moved in and are already noticing issues, we're here to help. Get in touch with Brickkickers on 0845 226 6036 or email info@brickkickers.co.uk to discuss an inspection tailored to your property.