![]() ![]() Additionally, compression perpendicular to grain design values (F c) are included as a consideration for selection of joists and rafters. Then you finish the house like a regular home. 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). The 2300 sq foot home goes up on the foundation in about 5 days. The spec's were for SPF and they substituted the SPF for SYP, the better wood. Potentially, this is a big problem and you need more info to assure you of the needed quality. I would think that you are due a very large discount, and then I still worry about the floor bounce, or else you need to write a letter to the federal trade commission and expose these people for what they are. Span Tables for Rafters (to BS 5268-7.5) Imposed loads of 0.75 kN/m² snow load are applicable to most areas where the altitude does not exceed 100 metres (refer to BS 6399-3) Imposed loads of 1 kN/m² snow load are applicable to most areas where the altitude exceeds 100 metres but does not exceed 200 metres, but excluding parts of Scotland. The analogy of being shown the Caddy and getting the Geo is correct. But if they used the same size members and same spacing for SPF as designed for SYP, you are getting less than you agreed to and will likely have very bouncy floors, etc. If the re-engineering is correct, the floors and roof will be fine with SPF. SPF cannot span the same distance as SYP, so you must have closer spacing, larger sized pieces (2x10 instead of 2x8, for example), etc. Rafters act as support for roofs of houses, sheds, porches, cabins, and garages. Quite often, the distance a beam can span is also determined by the spacing of joists or rafters it will support, and vice versa. If it is for joists and rafters, big difference. Roof Rafter Spacing, Span, and Sizing Explained. The distance a joist, rafter, or beam can span depends on the wood species, grade of lumber, loads, and how they are used. Where are they substituting SPF? If it is for the studs in the walls, no problem. ![]() From Professor Gene Wengert, forum technical advisor: ![]()
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