We can build a roof lantern to any size assuming that structural considerations are met.
When evaluating the design of larger roof lanterns it will be apparent that considerations of weight, structural integrity and lateral stresses are all important. In some situations restraining tie bars may be necessary although quite often in the case of roof lanterns without vertical glazing, the builder's supporting kerb / upstand can be constructed to contain the lateral forces thus obviating the need for horizontal tie bars.
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