Understanding Roof Ridge Sagging

January 26, 2024 | Chester County

Many homes have sagging roof ridges, such as this bar room of a local winery we had the privilege to inspect. This article explain some of the causes of sag in rafter roof structures.The Basics of a Rafter RoofThe basic structure is the triangle formed by the rafters which attach to the ridge board at the top and to the ceiling joists at the bottom. Triangles are the building blocks of all roof structures. To limit the rafters bending from the load on them, collar ties are added. They form a smaller triangle within the larger one. Collar ties are in the upper third of the rafter span, and are 1″x4″ lumber.Not shown in these diagrams, but there can also be rafter ties which are the same concept. Those go in the lower third of the rafter span and are 2″x4″ lumber. There is also a practical limit to the span … Continued

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Code is a dirty four-letter word. What’s your AHJ?

October 31, 2022 | Buyer Inspections

Why do inspectors reference the Authority Having Jurisdiction? Why don’t we just say something “is not to code” when we observe something that is, well, not to some code? Here’s why, with the necessary background.Code modelsThe International Building Code (IBC) is the core model that defines the base regulations and minimum standards for all buildings. If that was all there was to it, all buildings would be good, and life for a home inspector or commercial inspector would be simple. However, the IBC is intended to be adopted to accommodate laws and practices for any region. For example, a Florida beach home has to withstand storm surges whereas a California home has to withstand seismic activity. Both have the IBC at the core, specialized to accommodate regional needs. The International Residential Code (IRC) is adopted from the IBC for residential buildings (homes). All States follow the IRC. There are also code … Continued

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