| Window Type |
Generation 1
Wooden |
Generation 2
Steel |
Generation 3
Aluminum |
Generation 4
uPVC Windows |
| Cost |
High Cost |
Low Cost |
Low to Mid Cost |
SL Series
Suits all Budget
Low to High |
| Maintenance |
Maintenance Intensive |
Maintenance Intensive |
Not Maintenable |
Virtually
Maintenace Free |
| Corrosion / Termite Attack |
Termite & Rot Attacks |
Highly Corrosive |
Corrosive |
NO Corrosion or Termite Attacks |
| Weather Proofing |
Leaks & Draughts |
Leaks & Draughts |
Leaks, Draughts & Wind Rattle |
NO Leaks
NO Draughts
NO Rattle
Self-Draining |
| Sound Proofing |
Average Subject to Wind Noise |
Poor Subject to all Noises |
Poor Subject to all Noises |
Excellent Sound Proofing |
| Thermal Efficiency |
Excellent |
Poor |
Poor |
Excellent Thermal Efficiency |
| Ease of Operation |
Difficult if not Maintained |
Impossible if not Maintained |
Not Smooth |
Smooth / Easy Gliding Action |
| Insect Screen |
Optional |
Optional |
Optional or Included |
Included with Sliding
Many options |
| Warranty |
None |
None |
None |
10 YEARS |
