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Flat Roof Construction.
Mac Carpentry.

Mac Carpentry,
Seacourt,
Clontarf,
Dublin 3.
Ph. 087 368 1121.

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Flat Roof.
 

Structural Work Needed First,
A Concrete Ring Beam

Before work could begin on the flat roof, a ring beam needed to be formed using plywood, reinforced with steel and filled with concrete. To make the building structurally sound. Before work could begin on the flat roof, a ring beam needed to be formed using plywood, reinforced with steel and filled with concrete. To make the building structurally sound. Another course of block was added to bring the height of the ceilings up on the inside.

Flat Roof
With Ridge Beam

Now the walls are strengthened and to height, the framework for the new flat roof can begin. Firstly the overlong Ridge beam is set in place with the correct fall built beneath it. One inch per foot in this case. The rafters are cut to size and spaced on 16 inch centres, catching all edges of the plywood sheathing.Now the walls are strengthened and to height, the framework for the new flat roof can begin. Firstly the overlong Ridge beam is set in place with the correct fall built beneath it. One inch per foot in this case. The rafters are cut to size and spaced on 16 inch centres, catching all edges of the plywood sheathing.

Timber Bridging
 

The timber bridging(or blocking) is spaced at 4 feet on centre catching the other edge of the plywood whilst preventing the rafters from twisting. A small space has been left between the ridge beam and plywood for the circulation of air after the ceiling is in place.The timber bridging(or blocking) is spaced at 4 feet on centre catching the other edge of the plywood whilst preventing the rafters from twisting. A small space has been left between the ridge beam and plywood for the circulation of air after the ceiling is in place.