RAFTER SPACING FOR METAL ROOF ON LEAN CODE

The species and grade of timber determine the strength class of timber. Source – North and North Eastern Europe including ScandinavianĪbbreviated strength classes are used to divide timber up in ascending order of its strength. Whitewood, redwood or whitewood and redwood combined. Western European (including Britain) Sitka/Norway spruce, pine and Douglas fir.

RAFTER SPACING FOR METAL ROOF ON LEAN CODE

Examples of abbreviated species and source code are: The stamp contains abbreviated forms of the species and source code as well as other information. Timber is stamped to make identification easier on site. Spruce, fir, pine, redwood, whitewood, and larch are some typical species of softwood used in Ireland. This timber is sourced both in Ireland and abroad.

In Ireland, the standard timber used in domestic construction is softwood. If more economical sections are required that are still compliant with the building regulations, roof members may be designed by an engineer. These reflect the requirements contained in Eurocode 5 and the Irish National Annex. The work from this review by the NSAI Timber Standards Consultative Committee is reproduced in the tables in this section. Currently, the NSAI are publishing a revised publication that should be followed. 444: Structural use of Timber has been withdrawn with the implementation of Eurocode 5 and is currently under review by the NSAI. The NSAI publishes Eurocodes and makes them available across Ireland.

Eurocode 5 is just one of many structural design codes for building and civil engineering works designed to harmonise codes and standards across the European Union.

EN 1995-Eurocode 5: Design of Timber Structures should be adhered to when designing timber structures and structural elements.

Rafter spacing for metal roof on lean