Framing Cone Shaped Roof

Small conical roofs such as are frequently used on small circular towers are best framed as shown in fig.

Framing cone shaped roof.

Oddly enough the budget must be met. The issue is not the 12 12 pitch pentagonal timberframe built with 6x12s but the lofting of the over framing to create an insulated conical shape that must fair into a 12x12 common roof constructed of 6x12 timberframe rafters. Framing of conical roofs. Conical roof framing actually via the formula below an octagonal structure with 8 5 foot legs will have a diameter of 22 2 1 2 between apexes.

A small circular turret or tourelle with a conical roof is called a pepperpot or pepperbox turret. It wouldn t have a diameter of 8 5 untill about 6 10 above his top plate. When well spiked together they thus form a continuous ring to resist the outward thrust of the rafters. There are 2 kindsof conical roof molds.

Mansard roofs are a type of hip roof where each sloping section is divided in two. Both of these molds contain the same basic block shapes. Such conical roofs were usually constructed using a timber framed support structure covered with slate. The plate should be cut out of wide planks and always made of two thickness put together so as to break joint.

In this case the cone roof was surrounded by a protective wall a parapet or a battlement. To create maximum space under the roof the section near the walls rises steeply. Either of these molds can be used to make conical roofs for 3 4 6 and 8 diameter towers.