The Roof Is The Equivalent To 0 5 In Of Wood

A common choice for flat roofing material is epdm rubber as it is highly durable waterproof and can be made from recycled materials.

The roof is the equivalent to 0 5 in of wood. 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. The load increases with the use of heavier roofing material. A comprehensive source of technical information on wood characteristics is the wood engineering handbook second edition forest products laboratory 1990. It is a lightweight choice very long lasting and very resistant to.

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. The tension side of floor joist members inches or greater in nominal thickness shall not be notched except at the ends of the members. The smallest pitch of a roof is 0 5 12. Therefore in order to apply this exemption to floor trusses the trusses must be tested and evaluated for equivalency to the fire performance of nominal 2 x 10 lumber.

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. For l 180 multiply by 0 5. 4 prescriptive rafter span tables. When the header joist span does not exceed feet the header joist may be a single member the same size as the floor joist.

Chapter 5 design of wood framing 5 2 1 lumber general as with all materials the designer must consider wood s strengths and weaknesses. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. A clay tiled roof may have a dead. 2015 irc section r502 8 1.

Pvc or vinyl flat roofing is one of the most common forms of flat roof coverings. Again equivalent alternatives are possible through the u factor approach. For the most part the knowledge embodied in the. 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.

Floor assemblies using wood trusses may be approved for exemption if the floor assembly demonstrates equivalent fire performance. Photo by american weather star roof coating system licensed by cc by sa 3 0.