Over Spanning Of Roof

An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.

Over spanning of roof.

Being lifetime carpenter i know the sheathing is good underneath in attic good and by using 1 1 4 tacks i can feel the tecture of the wood when i drive the nails with my hatchet. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. The best roof pitch depends on the style of roof you are going for.

For a porch roof the beam needs to be sized according to the maximum snow loads in your area and you must know enough about the porch design to determine how the load will be distributed and over what distance the beam will carry the load. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. The width is the total span across which is from container to container. Wood beam calculator american wood council website rafter and joist span faq.

Span calculator for wood joists and rafters also available for the android os. The process involves one simple equation and some knowledge of the loads that the beam will carry. For a gothic style the rafters must equal the span 60 while an elizabethan style requires the rafters to be longer than the span. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

If you a looking for a sleek modern style a not entirely flat roof with a pitch of 1 40 should be used. The length refers to the measurement along the containers and along the roof ridge line. Live load is weight of furniture wind snow and more. 1 ft 0 3048 m.

40 maximum space between the containers. Over the top with shake faux architectural weaves over old valley cuts. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Maximum rafter spans for a patio roof.

The roof looks sharp. Gb36 12 5 gb56 14 6 gb5630 24 gm20 13 7. How large of a span can the kits have. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

For heavy roofs or in. Don t be fooled by all the hype about full tearoffs. The table below shows common roof pitches and the equivalent grade degrees and radians for each. What are the peak heights of your kits.

Dead load weight of structure and fixed loads 15 lbs ft 2. Also available for the android os. 2 are indicated below. 1 psf lb f ft 2 47 88 n m 2.