Lightweight roofing construction - with inverted triangular section framework having internal and external vaultings and glass fibre stiffening

摘要

A building material for roofing and walls has an impervious curving skin, a longitudinal hollow isosceles triangular section standing on its apex, and with faces across pairs of sides. The face opposite the apex has vaultings at right angles to the edges, the other two or mirror images of each other with alternately external and internal vaults at right angles to the edges. Light-weight construction is able to take the roofing loads and simultaneously provide the roofing skin.