The life of teak wood doors and windows is usually taken to be..........
Service Life vs. Natural Durability of Timber
It's important to distinguish between the natural durability of a timber species and the expected service life of a finished product. Teak is an exceptionally durable wood that can last for centuries in protected conditions. However, the "service life" for engineering and building codes refers to a standard, reliable lifespan for a component like a door or window under normal exposure and maintenance conditions. This is often a conservative estimate used for planning and valuation.
📝 Detailed Analysis of the Options
(a) 80 year & (b) 60 year
While a well-made and perfectly maintained teak window could certainly last this long or even longer, these figures are generally considered too high for a standard engineering assumption of service life. They represent exceptional cases rather than the typical expected lifespan.
(d) 20 year
This is too low for a high-quality, durable hardwood like teak. A 20-year service life would be more typical for doors and windows made from less durable timbers or those with lower quality construction.
(c) 40 year
This is the correct answer. For the purpose of building codes, valuation, and general engineering practice in India, the standard service life for teak wood doors and windows is typically taken as 40 years. This assumes good quality timber, proper construction, and reasonable maintenance. It provides a reliable baseline for assessing the longevity of these building components, even though their actual physical life could be much longer under ideal conditions.
📊 Standard Service Life of Building Components
| Component | Material | Typical Assumed Service Life (Years) |
|---|---|---|
| Doors & Windows | Teak Wood | 40 |
| Doors & Windows | Sal Wood | 25-30 |
| Doors & Windows | Secondary Hardwoods | 20-25 |
| Structural Timber (Beams) | Sal / Teak | 50-60+ |
💡 Study Tips
- 40 is the Standard for Teak Joinery: For exams, 40 years is the standard accepted service life for teak doors and windows.
- Distinguish Service Life from Actual Life: Understand that the "service life" is a conservative engineering estimate, not the absolute maximum time the wood can last.
- Context Matters: The expected life of timber depends on its use. A protected internal beam will last longer than an exposed external window.