The Roof Is The Equivalent To 0 5 In Of Wood

Pvc or vinyl flat roofing is one of the most common forms of flat roof coverings.

The roof is the equivalent to 0 5 in of wood.

When the header joist span does not exceed feet the header joist may be a single member the same size as the floor joist. Photo by american weather star roof coating system licensed by cc by sa 3 0. If you size a roof beam like a structural ridge that has a l 240 limitation you would multiply the minimum e value by 0 666 785 000 x 0 666 522 810 in this case. Most metal roof covering comes with a 30 to 50 year warranty with most types lasting far longer.

A common choice for flat roofing material is epdm rubber as it is highly durable waterproof and can be made from recycled materials. 4 prescriptive rafter span tables. Osb and plywood come in thicknesses ranging from 5 16 to 3 4 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof design. Chapter 5 design of wood framing 5 2 1 lumber general as with all materials the designer must consider wood s strengths and weaknesses.

2015 irc section r502 8 1. Again equivalent alternatives are possible through the u factor approach. The tension side of floor joist members inches or greater in nominal thickness shall not be notched except at the ends of the members. A completely flat roof is a poor design as water and snow will collect on it eventually leading to your roof collapsing in from the weight of it all.

1 1 2 lp solidstart lsl 20 psf roof live or snow load 125 or 115 spacing grade 10 psf dead load 20 psf dead load. The smallest pitch of a roof is 0 5 12. Floor assemblies using wood trusses may be approved for exemption if the floor assembly demonstrates equivalent fire performance. Continuous insulation 0 0 5 osb 7 16 0 62 0 62 0 62 spf stud 6 875 6 875 6 875 spf header 6 875 6 875 6 875 cavity insulation 20 25 20 1 2 drywall 0 45 0 45 0 45.

For l 180 multiply by 0 5. For the most part the knowledge embodied in the. A comprehensive source of technical information on wood characteristics is the wood engineering handbook second edition forest products laboratory 1990. A clay tiled roof may have a dead.

It is a lightweight choice very long lasting and very resistant to. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.