The Sélection Vosges sawmills provide their clients with a “Guide to the Use of Sections for Boards and Roofing”. Information, tables, sound advice for the use of the correct section as a function of the spans. What would the correct spacing be for joistS and purlins? What purlin section should be used depending on the type of roofing and the slope of the roof? The answers to all these questions and many others can be found in this guide.