On the other hand if the space is too small to provide adequate space for storage, the user is limited or not physically capable of storing anything in such a small space. If we look back at the definition above for live loads we can see that attic storage is considered a live load since this load is produced by the user given the nature of the space.īasically if the space is large enough to accommodate storage of various items, the user will use the space as such. Now for the case of sizing your ceiling joists, these loads vary depending on whether the attic space above is designed for with or without storage. The weight of the materials of construction incorporated into the building, including but not limited to walls, floors, roofs, ceilings, stairways, built-in partitions, finishes, cladding, and other similarly incorporated architectural and structural items, and fixed service equipment. This does not include construction or environmental loads.ĭead loads are defined by the code as follows: Loads produced by the use and occupancy of the building or other structure. Live loads are defined by the code as follows: The code recognizes 2 types of loads that are applied to ceiling joists: Live Loads and Dead Loads. Before we look at these tables, we need to make sure the correct design loads are determined prior to selecting the correct table. These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. Ceiling Joist LoadsĬeiling joists are sized based on one of two tables found in the code. In this post we will learn to correctly size a ceiling joist based on its span, spacing and type of lumber used. Please be aware of which version of the IRC you are using since the allowable spans can vary.) For the purpose of consistency, this post will reference the 2015 IRC. The allowable ceiling joist span tables in the 2018 version are found in section R802.5. (Note: the table references have changed in the 2018 version of the IRC. The design and construction of ceiling joists are found in section R802.4 of the IRC. In this post we will cover wood roof framing members, specifically ceiling joists. To understand what types of structures fall under the IRC, check out this Post. The International Residential Code (IRC) recognizes two types of conventional roof and ceiling framing systems for buildings that are subject to the International Residential Code (IRC): wood framing and cold-formed steel framing. Roof/ceiling members must be properly designed to ensure they provide adequate support as required by the loads that are imposed on them as well as making sure these loads are correctly transferred to the supporting walls and/or supporting structural elements.
#Ontario building code ceiling joist span tables how to
Want to learn how to easily size ceiling joists?Ĭhapter 8 of the 2015 International Residential Code (IRC) regulates the design and construction of roof and ceiling systems.
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