I joists are a structural timber joist which offer the benefits of increased spans and strength to weight ratio over traditional solid timber joists. Their design also offers a higher construction efficiency and holes can be drilled quickly and easily leading to minimal waste and an overall reduction in worktime of around a third when compared to solid joists. Low levels of shrinkage and high acoustic values also lead to good sound comfort and a less creaky floor. In addition to floors, I joists can also be used to form flat roofs.
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