What is PVC Joinery and How to Choose It? A Comprehensive Guide
Guide · 2026-01-12 · PenSoft Team · 9 min read
PVC joinery has become the go-to solution for windows and doors in Turkey over the last twenty years. This is not a coincidence: uPVC (rigid PVC) profiles offer heat insulation, soundproofing, ease of maintenance, and cost balance all at once. However, "PVC window" is not a single product; it is the sum of dozens of decisions from profile series to glazing unit, hardware to color. In this guide, we will sequentially address all the topics you need to consider when making the right choice, whether you are an end user or a joinery fabricator.
Profile Series: The Heart of Performance
The first element that determines the performance of a PVC window is the profile series. Series are generally referred to by frame depth: 60, 70, 80, or even 85 mm. This number is not just a thickness; it indicates the number of chambers within the profile and thus its insulation capacity.
- 60 mm series: Typically has 3–4 chambers. Preferred in economic projects, interior partitions, or moderate climates.
- 70 mm series: The "golden mean" of the industry. With 5 chambers, it offers thicker glazing units and a good price/performance balance. Most residential projects fall into this series.
- 80 mm and above: 6–7 chambers, triple glazing support, approaching passive house insulation values. Suitable for cold climates and projects with high comfort expectations.
When selecting a profile, pay attention not only to the number of chambers but also to the size of the steel reinforcement channel. PVC is a flexible material; its resistance to wind load and sash weight is provided by the galvanized steel sheet embedded within the profile. Insufficient steel in large sashes can lead to sagging and closing issues over time.
Glazing Unit: The Main Gate for Heat and Sound
A large portion of a window's surface area is glass; therefore, this is the most critical point for both heat loss and sound transmission. Glazing units are expressed in the language of "thickness + air gap + thickness":
- 4+12+4: Standard double glazing. 4 mm glass, 12 mm air gap, 4 mm glass.
- 4+16+4: Increasing the air gap slightly improves insulation.
- 4+12+4+12+4 (triple glazing): Two air gaps, three panes of glass. Makes a noticeable difference in cold climates.
The gas placed in the air gap (dry air or argon) and the Low-E (low emissivity) coating on the glass surface are as important as the profile. Low-E coating retains indoor heat in winter and keeps solar heat out in summer. Today, in energy-conscious projects, Low-E is no longer a luxury but a standard.
Another critical yet often overlooked detail is the warm edge spacer. Traditional aluminum spacers create a "cold bridge" at the edge of the glass, setting the stage for condensation. Warm edge spacers break this bridge, raise the surface temperature at the edge, and reduce condensation.
Hardware: The Backbone of the Window
All mechanisms that ensure the sash opens and closes, seals properly, and provides security fall under the hardware category. A good profile and glazing can turn into disappointment with weak hardware. Key considerations for hardware include:
- Opening type: Single opening (turn), double opening (turn + top-hung), only top-hung, sliding, bi-fold... Each type has its own hardware set.
- Number of locking points: The more locking points around the sash, the better the sealing and security.
- Brand and certification: Brands like Roto, Siegenia, GU, and Kale offer solutions in different segments. Durability against wear and opening-closing cycles is specified in certifications.
Color and Lamination: Aesthetic and Durability
While white PVC remains the most common choice, wood-patterned and colored foiled (laminated) profiles are rapidly gaining popularity. Color selection is not just an aesthetic decision:
- Double laminated (coated on both inner and outer surfaces) profiles are more durable in dark colors on the exterior.
- Dark colors absorb more heat in sunlight; therefore, steel reinforcement and hardware selection become even more critical in large and dark sashes.
- Color should be clarified with RAL codes or the manufacturer's foil catalog. Names like "anthracite gray" may vary from manufacturer to manufacturer.
Sill, Roller Shutter, and Accessories
A window or door often does not come alone. The bottom sill (especially in balcony doors), roller shutter box, architrave, window sill (marble), and insect screen are accessories that directly affect both function and price. For example, the roller shutter box reduces the net height of the joinery; failing to account for this when providing measurements can lead to surprises during installation.
From the Manufacturer's Perspective: Making the Right Choice at the Quotation Stage
While the choice for the end user is a matter of comfort, for the manufacturer it is also a matter of cost and quotation. A customer's request for a "70 mm white window" encompasses dozens of sub-decisions: which series, which glass, which hardware, how many sashes, opening directions, is there a roller shutter?
At this point, a digital drawing and quotation tool comes into play. When you enter the dimensions of the item and select the openings, if the profile linear metre, glazing square metre, and accessory quantity are calculated automatically, both the margin of error decreases and you can present a clear, illustrated quotation to the customer within minutes. PenSoft's drawing studio is designed precisely for this purpose: it visualizes your choices, calculates the measurements live, and prepares the quotation with a single click.
Summary: Checklist
When selecting the right PVC joinery, follow this order:
1. Determine the profile series according to climate and expectations (60/70/80 mm). 2. Choose the glazing unit based on insulation and budget; evaluate Low-E and warm edge. 3. Clarify the quality hardware suitable for the opening type. 4. Make a decision on color/lamination for aesthetics and durability. 5. Plan accessories like sill, roller shutter, and architrave from the start. 6. Gather all these decisions into a clear quotation — not by guesswork, but by calculation.
Common Selection Mistakes
Even with the right information, there are a few recurring mistakes in practice. Knowing these protects both the end user and the manufacturer:
- Looking only at the profile series: Saying "I bought an 80 mm series, it's the best" can be misleading. An 80 mm series that neglects glass, hardware, and steel can perform worse than a well-designed 70 mm series. The system is a whole.
- Overlooking steel: Often the most neglected element because it is not visible. Insufficient steel in a large sash means sagging and closing issues within a few years.
- Ignoring the color-heat relationship: Dark colors are stylish but absorb more heat in sunlight; if hardware and steel are not selected accordingly in large and dark sashes, problems will arise.
- Leaving the glazing unit as standard: Saying "double glazing" without considering asymmetric/acoustic glass on the street facade or triple glazing in cold climates can lead to regret later.
- Postponing accessories: If the roller shutter box height, window sill step, and architrave are not planned from the beginning, surprises during installation are inevitable.
The common point of these mistakes is making decisions piece by piece. However, a window is not the sum of parts but a system that works together.
Maintenance, Lifespan, and Warranty
A well-chosen PVC window is long-lasting, but it is not "maintenance-free". A few simple habits can significantly extend its lifespan:
- Seal (gasket) check: Over the years, seals can harden and lose flexibility. When air or sound leaks begin, replacing the seal restores the window's impermeability.
- Hardware lubrication: Periodic lubrication of hinges and locking points maintains smooth operation and slows wear.
- Cleaning of drainage holes: If the drainage channels at the bottom of the frame become clogged, water can accumulate and cause problems. Simple cleaning prevents this.
- Surface cleaning: PVC surfaces can be easily cleaned with a damp cloth; avoiding abrasive chemicals preserves the life of the foil.
On the warranty side, it is important to be clear: the warranties for profiles, glass, hardware, and roller shutters may differ. The manufacturer should explain to the customer upfront which parts are covered and for how long. A transparent warranty statement strengthens trust and satisfaction.
Frequently Asked Questions
Should I choose a 60 mm series or a 70 mm series? This depends on climate and expectations. In a moderate climate, a good 60 mm series may suffice with a reasonable budget. However, in cold climates, if triple glazing or high insulation is desired, a 70 mm (or even 80 mm) series is more appropriate. The 70 mm series is considered the "golden mean" in terms of insulation, glass capacity, and price balance for most residential projects. When deciding, look not only at the series number but also at the number of chambers and steel reinforcement within.
Are colored (laminated) windows less durable than white ones? Not if quality foil is used. Modern foils are resistant to UV and weather conditions and retain their color for years. The critical point is dark colors: dark surfaces absorb more heat in sunlight, so steel reinforcement and hardware should be selected accordingly in large and dark sashes. When properly configured, a colored window can be as long-lasting as a white one.
Is double glazing sufficient, or should I get triple glazing? For most homes, a good double glazing with Low-E coating and argon filling provides sufficient comfort. Triple glazing makes a noticeable difference in cold climates and high insulation expectations; however, since it is heavier, hardware and profile selection must be appropriate. If street noise is a concern, asymmetric (different thickness) glass is more important than triple glazing.
How long does a PVC window last? A PVC window made from quality profiles, glass, and hardware, properly installed, can easily last 30–40 years. Simple maintenance like seal replacement and hardware lubrication can extend this lifespan even further. The lifespan of the window is as long as its weakest component, so it is healthiest not to skimp on any part.
Making the right choice is the foundation of comfort and satisfaction that will last for years. Every decision made with knowledge benefits both the end user and the manufacturer.