Building Applications


5. MDF window boards


MDF, typically 25 mm thickness, is being used increasingly for window boards (cills) as it has the following advantages over solid wood.



1. Available in long lengths in a range of cut size widths from 150 to 300 mm or wider for special applications.
2. Easily machined with hand or simple power tools on site.
3. Manufactured at 8 ±3% moisture content and therefore ready to use.
4. High stability eliminating shrinkage and cupping defects resulting from changes in moisture content after fixing.
5. Pre-machined rebate for tonguing into window frame and bull nose front edge.
6. Uniform properties from batch to batch resulting from manufacturers quality control procedures.
7. Can be supplied pre-primed with grain and knot free surfaces for a high quality paint finish.
8. High resistance to surface and edge impacts.

Moisture resistant MDF window boards should be used for timber frame constructions and dry lining applications. Boards manufactured from moisture resistant MDF are also recommended for use in conjunction with brick, block and plaster constructions.

The cut edges of primed boards must be sealed with a moisture resistant material before fixing. Otherwise, fixing procedures are similar to those used for conventional solid wood window boards.