Lumber Roof Loads

If you place the 2x6s at 16 o c then syp can span over 16 and spf can span 14.

Lumber roof loads.

The structural goal of a house is to safely transfer building loads weights through the foundation to the supporting soil. The loads are based on adjusted roof snow loads from the governing building code. Spf 2 6 rafters can span 8. Let s start by taking a broad view.

Sawn lumber limits design potential and in some cases just doesn t work. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. The roof load is composed of a dead load and a live load. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

You can t beat sawn lumber for most small window headers but as spans and loads increase stronger materials are a better choice. An spf roof at the same spacing and lumber size will span 11. These numbers are for roofs supporting light loads of 20 pounds for square foot. The live load depends on the maximum snow load in your area.

Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. For roof live loads less than 20 pounds per square foot psf rafter spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. Too often builders gang together 2 inch dimension lumber to support roof and floor loads without considering other options.

Wood screws withdrawal forces allowable withdrawal load force wood species moisture content and weight weight of green and air dried fire wood wood panel and structural timber products mechanical properties density fibre stress compressive strength and modulus of elasticity of clear wood panel and structural timber products. Determine the load per square foot that the roof must support. A clay tiled roof may have a dead. For heavy loads at 24 o c 2 6 syp can span up to 9.

Span calculator for wood joists and rafters also available for the android os. For roof live loads of 12 psf or 16 psf. A complete analysis of wood s mechanical properties is complex but understanding a few basics of lumber strength will allow you to size joists and rafters with the use of span tables. The load increases with the use of heavier roofing material.