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I-Loft from Simpson Strong-Tie is a revolutionary way to convert a loft using engineered timber I-beams instead of heavy steel girders.
Timber I-beams are very strong, but also very light, which means they can be passed into the roof space by hand, so there is no need to hire a crane. And since the beams are installed from wall-plate to wall plate they can passed into the roof via the removal of several rows of roof tiles (instead of through side walls). Also, they do not penetrate party walls, which gives a saving in legal fees (on average £750 per wall is saved).
As this video demonstrates, the JES connector allows the modification of the timber I-beams, allowing them to fit into the eaves of the roof.
Safe, simple and cost effective to install.