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How to size rafter snow loads

2013-05-05   Views:33

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The load of snow that a rooftop can hold needs to be determined by the area in which you live. Obviously, builders in upper Michigan are going to worry more about snow load than people in Tennessee. Easy online programs allow you to input your buildi

How to size rafter snow loads

The load of snow that a rooftop can hold needs to be determined by the area in which you live. Obviously, builders in upper Michigan are going to worry more about snow load than people in Tennessee. Easy online programs allow you to input your building's specific information and calculate the requirements for your area's snow load.

Skill level:Moderate

Things you need

Building code book

Instructions

1 Check your local building codes. Every area of the country is divided into zones. Your snow load requirements are in your locality's code book. The law requires following these codes, which are imperative for keeping your home safe.

2 Go to the online site for the American Wood Council. On the worksheet enter the type of wood, the deflection limit, the type of joist, the grade of wood, the size of construction wood, the proposed spacing, the exterior exposure, wet service conditions, incised lumber, the calculated live load and the calculated dead load. Click "Submit" and the worksheet will calculate it for you. It is recommended that you follow the code in your cities code book.

3 Consult a span table. Go to your local library or bookstore and look for a reference material such as "Span Tables for Joists and Rafters 2005," according to the American Wood Council.

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