1.
The purpose of drilling this hole is to allow more
room for the rubber strip to compress.
This strengthens both the installation
of the rubber strip and the sealing effect.
2.
The height of the sealing strip is crucial for a good seal.
A height 2-3mm greater than the gap is sufficient
to achieve a proper seal.
These special perforated sealing strips can be up to 30% higher
than the 2-3mm gap, further enhancing the seal by up to 50%.
3.Perforated rubber strips are less restrictive in width,
allowing them to accommodate larger tolerances.
The perforation allows for a wider range of stretch
and allows the strip to fit more tightly.