7 May 2025
The Most Common Window Installation Mistakes in Multi-Family Construction – and How to Avoid Them
Proper window installation is a critical success factor in any construction project – especially in large-scale residential developments, where errors can significantly impact the budget, schedule, and buyer satisfaction. As a company, AM OKNA specializes in comprehensive support for B2B clients (developers, installers, dealers, and investors), helping ensure high execution quality through technical consultation, training materials, and innovative installation systems.
1. Improperly Prepared Window Openings – The Root of Many Installation Problems
Many installers still underestimate the importance of properly preparing the window opening. Lack of leveling, uneven edges, gaps, and missing moisture barriers result in leaks and costly rework.
How to avoid it:
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Conduct a thorough inspection of the opening before installation
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Level all surfaces and use system-based mounting pads
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Ensure correct window sill slope and full perimeter sealing
2. Use of Inappropriate Sealing Materials
A common mistake is using only PU foam without proper vapor-tight or vapor-permeable sealing tapes. This can lead to moisture damage, mold growth, and customer complaints.
Recommendation:
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Choose warm installation techniques – with vapor-permeable tapes on the outside and vapor-tight tapes on the inside
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Use AM OKNA’s system-based solutions, recommended by leading profile manufacturers
3. Incorrect Anchoring and Leveling of the Frame
An incorrectly anchored or misaligned window can result in air leaks, operating issues, and mechanical damage.
Solution:
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Use appropriate shims and anchors at recommended intervals
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Work with laser levels for precise alignment
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AM OKNA’s technical training helps avoid such mistakes during the construction phase
4. Lack of Thermal Insulation and Expansion Gaps Around the Frame
Skipping proper insulation leads to thermal bridges, which cause interior dampness and mold on walls.
Recommendation:
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Use low-expansion foam and mineral wool to fill gaps
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Seal everything with appropriate sealing tapes and vapor barrier membranes
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Follow energy-efficient window installation guidelines
5. Installation Not in Accordance with the Manufacturer’s Guidelines
Ignoring the technical documentation is a sure path to voided warranties, functional issues, and customer complaints.
Recommendation:
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Always follow the manufacturer’s technical instructions
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Work with certified installation teams familiar with the specific window system
Why AM OKNA Is Your Technical Partner for Construction Projects
As a provider of system-based window solutions for the B2B sector, AM OKNA supports project developers, dealers, installers, and investors at every stage of a construction project – from planning to final delivery.
AM OKNA offers you:
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Technical training materials for installation teams
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Support from experienced technologists who provide guidance in complex installation scenarios and ensure the correct use of our products
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Solutions for heavy and non-standard installations, such as special carriers and lifting systems for large glass elements on construction sites
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Complete systems for warm installation of windows and doors
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Technical documentation, quality certificates, and compliance with EnEV / WT2021 standards
Partnering with AM OKNA means smooth logistics, expert technical support, and reliable installation solutions – even for demanding construction projects.
Are you looking for a manufacturer and partner who understands the realities of construction sites and supports you with more than just products, offering real-world technical solutions? Contact AM OKNA – your reliable B2B partner.
