Window & Door Selection for Self-Built Homes/Residential Renovations:

This project uses system windows (black frame) instead of ordinary broken bridge aluminum windows—a must for self-built homes with large glass panels:

• First, check wall thickness: System windows require a wall thickness of ≥1.8mm (ordinary broken bridge aluminum is often 1.4mm). The large floor-to-ceiling window in the case  has a large, heavy glass panel; a thick frame prevents deformation.
• Next, check cavity structure: System windows feature an integrated cavity (ordinary broken bridge aluminum uses construction). The case is located near a street , and the cavity design enhances sound and heat insulation—outside noise is barely audible when the windows are closed.

1. Double insulated tempered glass (5+20A+5): "5" refers to glass thickness; "20A" is the width of the insulated gap—the wider the gap, the better the sound/heat insulation (choose 20A+ for street-facing or top-floor spaces).
2. Tempered certification: Large glass must have a tempered label . If broken, it shatters into granular pieces to avoid injury.
3. Low-E coating: The glass in the case has an invisible Low-E layer (subtle reflection in light), which blocks UV rays and heat in summer, preventing the living room from overheating.

• Balconies/living rooms: Choose lift-and-slide doors (used in the case)—they slide open for ventilation and close to form a full large glass panel  wide view), saving more space than casement doors.
• Bedrooms/small spaces: Choose casement windows (not shown in the case but recommended for bedrooms)—they seal better than slide windows, ideal for noise-sensitive areas.
• Note: Avoid outward-opening casement windows on high floors (wind can cause them to sway); prioritize inward-opening/inward-tilting styles.

These features really transform the door from a basic utility into a responsive, intelligent part of your daily life.

1. Sealing: Multi-layer seals + EPDM rubber strips
   
   
   The case uses "3-layer sealing" (frame + sash + glass) with EPDM rubber strips (sun-resistant and non-aging)—when closed, the strips fit tightly to prevent drafts and dust .
2. Hardware: Choose branded options, don’t settle for "free gifts"
   
   
   The case uses Sobinco hardware (a leading brand in the Europe market)—With over 70 years experience, specializes in the production and distribution of high-quality locks, hinges, and other hardware for windows and doors. it slides smoothly with light force, unlike cheap hardware that rusts and jams after 1 year.

Final Takeaway: The "Pitfall-Avoidance Logic" for Window & Door Selection