Table of Alternative Construction Timbers
Key:
| Rating | Description | |
|---|---|---|
| Availability | A | Readily available |
| B | Generally available | |
| C | Limited availability | |
| D | Only small quantities available | |
| E | Very limited supply | |
| Suitability for use | F | Suitable heart or treated |
| G | Suitable treated | |
| H | Suitable treated | |
| I | Suitable heart | |
| J | Not suitable, or not usually used | |
| Grades suitable for building | K | No 1F and No 2F |
| L | Framing | |
| M | No 1 and No 2 grading rules, unassigned strengths | |
| N | No grading rules and no assigned strength | |
| Grading suitable for engineering uses | O | Grading rules and strengths |
| P | Grading rules and no assigned strength | |
| Q | No grading rules but assigned strengths | |
| R | No grading rules and no assigned strength | |
| Natural durability of heartwood | S | Perishable (5 years) |
| T | Non-durable (5-10 years) | |
| U | Moderately durable (10-15 years) | |
| V | Durable (15-20 years) |
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