Ten Commandments of Proper Window Installation
Windows or doors must be fixed in the building opening using mechanical means. Foams, adhesives, and similar materials as fastening agents are not allowed.
1. Windows and doors must be mechanically fixed in the construction opening.
Foams, adhesives, and similar materials cannot be used as fastening elements.
2. Ensure sealing materials are dry during installation.
This helps maintain their thermal insulation properties.
3. Consider material expansion due to moisture and temperature changes.
Fastening elements must allow for material expansion. The forces caused by construction expansion must not be transferred to the window or door structure. Fixings should also respect the arrangement of vertical and horizontal dividers and maintain minimum distances. Failure to comply may cause unexpected internal forces in the frame, stress, deformations, and poor sealing between the sash and frame. This results in air leaks, poor insulation, and water penetration.
4. The joint layers must allow for ventilation (diffusion of water vapor) outward.
Protective measures must be taken on the exterior as well. The installation foam or other insulation material in the connection joint must also be protected from the outside. Even a 5% increase in moisture in the insulation material reduces its thermal performance by 50%! The general rule is: The inside must be more airtight than the outside!
5. The insulation foam must completely fill the joint between the window and the construction.
If the thermal insulation does not fill the entire joint width and length or the entire perimeter of the window frame, the temperature may drop below the dew point, leading to condensation issues.
6. Connection joints in the building envelope must meet technical standards.
They must ensure permanent hermetic sealing.
7. Exterior corners of window sills must be properly waterproofed.
This prevents moisture absorption into the thermal insulation beneath the external sill plate.
8. Ensure adequate thermal insulation on the exterior side of the window sill.
Prevent the penetration of water vapor from the interior to avoid condensation issues.
9. Plaster must never be applied directly to sealing foam.
Vapor-permeable plaster does not provide sufficient protection against indoor humidity.
10. All joints and connections must be sealed with durable sealing materials.
These materials must withstand weather conditions, expansion movements, and volume changes.
How to Avoid Installation Mistakes?
When signing contracts for window installation, always specify compliance with STN 73 3134 and require installation only by teams trained by SLOVENERGOokno according to this standard.
