Proper Window & Door Installation
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Analysis of 3-in-1 multifunctional tape installation and a detailed cost catalogue of sealing materials available on the Greek market.
1. Installation with Multifunctional Tape (3-in-1)
Answers to critical construction questions about the bottom sill and load transfer.
⚠ The 3-in-1 tape DOES NOT bear weight. The window must never rest on it.
There are two accepted practices for the bottom (the sill):
Method A: U-Shape (Most Common)
The 3-in-1 tape is applied only on the left, right and top. At the bottom no expanding tape is used. Purpose-made plastic load-bearing shims (or Purenit/Compacfoam sections) transfer the weight to the masonry. The bottom joint is filled with elastic foam (or MS Polymer) and sealed with EPDM tapes or liquid membranes.
Method B: Full-Perimeter (With Shims)
The 3-in-1 tape runs along the bottom too. However, it must be interrupted (cut) at the points where load-bearing shims are placed. The shims rest on solid substrate. The risk here is water ingress at the tape breaks, so exceptional sealing with hybrid polymers around the shims is required.
- Substrate Requirements: Unlike foam, the reveal (opening) must be perfectly flat, levelled and trowelled. Irregularities in bricks/plaster allow air to pass under the tape.
- Expansion Speed: In Greek summers (>30 °C), the tape expands extremely fast (within minutes). The technician must screw the frame in quickly, otherwise the tape will push the frame out before it can be levelled. (Tip: They keep the rolls in cooler boxes in summer.)
- Corners: At corners the 3-in-1 tape does not fold into a 90° angle. It is cut flush (butt joint) and the ends are pressed together. Any small gap at the corner must be sealed with hybrid polymer mastic.
- Size Selection: The joint gap must be measured precisely. If the gap is e.g. 15 mm, buy tape with an operating range of e.g. 10-20 mm. If the wrong size is installed, it will either not insulate (too small) or deform the frame (too large).
2. Materials Catalogue & Indicative Cost (Greece)
Prices are indicative retail (incl. VAT) and converted to per linear metre (l.m.) for ease of calculation.
| Category | Material / Type | Known Brands (Greece) | Est. Cost per Metre |
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3. Cost Comparison by Method (Per Linear Metre)
Visual analysis of sealing and fixing material costs for 1 linear metre of joint.
Data are estimates based on average Greek market prices (2026). Every installation is unique.