They are strong, constructed in an H cross-section to distribute the forces more effectively, and they can span large lengths without any concerns about sagging even over the long term. Steel beams are an excellent alternative. ![]() This is especially true of very old wood beams, which may have been installed over excessive spans of 15-20 feet or more, without the appropriate consideration of the forces exerted on the centre of the beam. ![]() Ultimately, a beam in any material is a structural feature, not a decorative one, and if a wood beam is showing signs of sagging or other damage such as rot and woodworm, it may be time to replace it with a new steel beam instead. Wood beams are a decorative feature in many older properties, and an aesthetic choice in some newer properties too, but they must be strong enough to support the roof or ceiling above them.
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