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About Posi-Joists. An engineered solution for your Project

At Harlow Timber Systems our in house team of sales & design staff will draw up & quote your project to meet your specification. Metal web joists provide a simple, adaptable and easy to work with solution for your new build or extension project, and make it easy to fit utilities, pipes & cabling. Posi-Joists can be used in floor & roof situations.