![]() If your old joists do not meet the requirements set by the table, they are either supported somewhere from underneath or they were installed pre regulations (November 1985). The Product Woodhouse Weatherproof® is a range of eco-friendly, timber building products manufactured for outdoor use in all structural and decorative applications. You need to measure the complete span of your floor joists, together with the distance between them (the ‘centres’) and the size of the timbers. Additionally, compression perpendicular to grain design values (F c) are included as a consideration for selection of joists and rafters. This table is for a dead load of more than 0.25 but not more than 0.50 and allows for an imposed loading of no more than 1.5 kN/sq.m. hese span tables for joists and rafters are calculated T on the basis of a series of modulus of elasticity (E) and bending design values (F b). Unless C24 timber is specified, the more generally used timbers are less expensive C16. It is again accepted that, for normal household requirements, the imposed load will not exceed 1.5kN/sq.m. The weight we place upon a floor by way of bathroom suites, beds, wardrobes etc, is known as the “imposed load”. ![]() This dead load is generally taken by architects and planners to be no more than 0.50 Kilo Newtons per square metre. Downloads -SmartLVL 12 Studs 2019 Edition 1: 1.36 MB: Download SmartLVL 12 Roof Batten 2019 Edition 1: 1.02 MB: Download SmartLVL 12 Framing VIC 2019 Edition 1: 1.24 MB: Download SmartLVL 12 Framing 2019 Edition 1: 1.31 MB: Download SmartLVL13 Design Guide 2021 Edition 1: 6. The joists must be able to support this dead load without sagging. The weight of the timber floor itself consists of the timber joists, the plasterboard ceiling underneath it (except for suspended timber ground floors), the floorboards and the nails or screws used to fix both of the aforementioned coverings.Īll of these are known as “the dead load”. (the tables permit a bearing length of up to 3.5 inches, but since 1.5 is probably the worst case that you’ll encounter for joist or rafter bearing, it’s a safe value. You can also download this excellent pdf span table guide (includes C16, C24 and I-joists) Table 9.1 in Span Tables for Joists and Rafters (Figure 5) gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1.5 inches. Building Control may ask for additional engineer’s calculations. These tables can help calculate whether floor joists are strong enough to support themselves and the load they carry, without the help of any walls underneath. ![]() Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.
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