The invention provide a roof capping comprising an internal capping member (1) for placement over a gap (2) between roof tiles or panels (3,4) and an external cap (5) for placement over the internal capping member (1).

In use, a first vent strip is located on a first side of a roof ridge pole, and a second vent strip is located on a second side of the roof ridge pole.

Four more holes are drilled and pegged to hold the whole frame together square, then its time to raise the ridge pole.

Then we cut a flat section on the tip where it will sit on the ridge pole leaving a consistent 6cm thickness of timber again helping keep the roof-line as flat as possible.

The roof structure is characterised in that the ridge assembly comprises a hollow extruded ridge bar (1) in the form of an inverted 'T' shaped extrusion having a central web 1(a) provided with a fastening means 1(b).

Take over the same mechanism but above the four main eaves put ridge beams forming a triangular support,

The two supporting ridge beam means (1) are connected with each other in the middle by a plurality of support parts (3).

The two supporting ridge beam means (1) are connected with each other at their both ends by two metal strip parts (2).

A prefabricated shed formed of plastic comprising novel extruded hollow wall and roof panels adapted to interlock together with the roof supported by a novel ridge beam assembly.

It was an intellectual difficulty for the architects who had to provide in each tower 9 wooden beams, 18 pillars and 72 ridge beams, because the sum of these numbers gives 99, a special number in the Chinese imaginary.