Jack Arch Roof Construction Details

The minimum depth at the crown is kept at 150 mm.

Jack arch roof construction details.

A jack arch is a structural element in masonry construction that provides support at openings in the masonry. Jack arch roof is composed of arches of either brick or lime concrete supported on lower flange of r s j s. Alternate names are flat arch and straight arch. Design considerations 5 1 general 5 1 1 the jack arch built up floor or roof shall consist of the following components.

The more traditional ones are called jack arches where the arches are formed in the roof itself supported by the centering while the recent researched type is arch panel roof where the arches are made on ground to be lifted up and placed. A jack arches constructed with bricks laid on edge in a single course with lime mortar or cement mortar of specified mix and supported over steel or concrete i shaped joists and having a suitable ceiling finish applied on to its soffit. Unlike regular arches jack arches are not semicircular in form. The rise of the arch is kept 1 12th of the span.

Instead they are flat in profile and are used under the same circumstances as lintels. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube.