The typical on-center spacing, according to the International Residential Building Code (IRC), is 12”, 16”, 19.2”, and 24”, which means the actual space between the rafters is 10.5”, 14.5”, 17.7”, and 22.5”. It is measured from the center of one rafter to the center of the next, also known as ‘on-center’, which makes it easier to determine the number of rafters based on the building’s length. Rafter spacing is the distance between parallel rafters or roof joists.
RAFTER SPAN HOW TO
Our goal is to provide a complete guide for sizing and spacing rafters for your projects. We’ll discuss 16” and 24” spacing, how to calculate the number of rafters required, 19.2” spacing, and the spacing when using metal roofing and for lean-to and porch roofs. In this guide, we’ll explain rafter spacing, code requirements, roof rafter span tables, and rafter spacing calculators. The wider the space between rafters often results in rafters of greater depth too. Depending on all contributing factors though, 16” and 24” are commonly used for most buildings. Standard industry roof rafter spacing is 12”, 16”, 19.2”, and 24” on-center, however other spacing may be used by a Structural Engineer. Plus, you have to select the correct rafter spacing to span the distance based on all the factors that affect your design. You have to consider live, dead, wind, and snow loads, select the correct species, grade, and dimension of lumber for the rafter span, and decide if there will be a ceiling or loft supported by the rafters. t?��v�� dhO.Designing and building a roof for a shed, porch, cabin, garage, or home can be a daunting task. 2 GRADE LUMBER)/Contents(ALL SPANS & SIZES WITHIN THE TABLES ARE BASED OFF OF SPRUCE NO.
SEE DRAWING A-2)/Contents(SEE DRAWING A-2)>ģ9 0 obj>/Matrix/Length 153> DRAWING A-1)/Contents(DRAWING A-1)/BS/Rotate 270/AP/NM(TSGCMPTODPZNIMZA)>Ģ9 0 obj>/Matrix/Length 149>
0 kommentar(er)
