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JLC ??AUGUST 1991 Designs that call for sunspaces or heavily glazed walls and roofs can often be handled with sunspace kits or commercially made sash and skylights. But in many cases, the best solution is to install fixed glass in simple framing systems built on site. If designed well, these glazing systems are economical and durable. And they give the designer great flexibility in the size, shape, and type of glazing. Although installing insulated glass units (IGUs) is not that difficult, there is no trade that specializes in the craft. Commercial glass dealers often have little knowledge of framing, while building contractors don't know glazing tapes and setting blocks. To successfully install or repair fixed glass, a builder needs both skills. I've built