Calcium Silicate Board
Types and Durability
| Description
Calcium Silicate board |
Expected Lifespan
(Years) |
Adjustment Factors |
| Fibre calcium silicate board to ASTM C 656-94a: 2001; Type 1 and 2. |
35 |
Routine access to ceiling void (more than twice/ year: -30% years
Excessive exposure to steam and moisture or under category ‘high humidity’ to BS8290:Part 2: -15% years Near overhead pipe: -10% years.Test certificate from approved local testing authority : +15% years |
| Fibre calcium silicate board. Approved by the manufacturer for the particular application. |
30 |
|
| Board of unknown characteristics and/ or not designated for proposed use. |
< 30 |
None |
In case of 2 or more conditions of adjustment factor occur, the percentage of year shall be added.
Note: Life spans quoted above are considered under ‘Normal” (N) environmental condition to BS 8290:Part 1.
Certain types of board are not suitable for damp or humid environments. Reference should be made to manufacturer guide.
Some non-metal materials are susceptible to dimensional changes and distortions caused by exposure to inappropriate environmental conditions either before or after installation.
BS 8290:Part 2 specifies the method for measuring the manufacturing tolerances (dimensional accuracy, squareness and flatness) of tiles, panels, etc. and includes for conditioning under the following environments:
- Normal: Relative humidity 65 ± 5% at 25 ± 2°C for 36 hours.
- High humidity: Relative humidity 90 ± 5% at 25 ± 2°C for 24 hours.
ASTM C 656:2001
- Type 1: Maximum use temperature= 760ºC
- Type 2: Maximum use temperature= 927ºC
BS 8290 provides useful complementary information to this work section:
- Part 1 deals with design issues generally.
- Part 2 specifies materials, manufacturing tolerances and strength requirements for suspension grids.
- Part 3 deals with installation issues.
Other sources of information include the Specialist Ceilings and Interiors Association (SCIA) guides and Health Technical Memorandum 60.