Making of an Arch panel roof - step by step guide
Some of the tiles which can be used in the panels,
Compressed earth tile, water proofing tile and table
moulded tile. The criteria in seclection is that the tile
chosen should have a minimum compressive strength of
The tile used should be soaked for sometime, for better adhesion to cement.
A casting mould needs to be prepared on the ground. The panels are made on this mould.
The size of the panels should be determined such that it is of a dimension and weight that can be carried easily by
Preparation of the mould- as per the size of the panel, a brick edge is laid on all four sides and the center filled with sand.
The steel template is then dragged along the length of the mould so that the sand gets the required curvature and then
the surface is plastered with cement mortar of 1:10 ratio.
The steel template is needed, to place the tiles in proper position. It also is a guide for the G.I wires(5mm dia or 8
gauge ), which is the reinforcement for the panel.
A thin layer of sand is poured in between the tiles to prevent the cement mortar from sticking to the mould. Then cement
Mortar is poured till half the tile height, after which the G.I. wire is inserted. The rest of the joint is then packed tightly with
The joints are filled with cement mortar (1:3). Note the newspapers between the mould and panel, to prevent mortar
sticking to the casting mould. The panel is to be left on the mould for a day, after which it can be moved.
The panel is to be left on the mould for a day, after which it can be moved to the stacking area.
Finished panels are stacked like this, joints are finished. The panel is cured for fifteen days. One mason and two
helpers make twenty five panels in a day.
Concrete beams are also cast on the ground, in a brick or steel or a wooden template.
Cured beams, ready to be assembled on the roof.
First time makers of panel should test the panels on ground to check for errors and for confidence building in the
masons. The Panel has to be installed on ground, in a similar situation as on roof. i.e. same bearing and end
conditions. Please note that in the picture, the bearing is too much. Sand bags can be kept at the edge of the panels
to provide a restraint like a beam would, when installed on the roof. After this it can be loaded by sand bags or
people standing on the panel. The panel in the picture supported 7 men before it failed.
The beam is a “partially-cast” beam, which will not have its designed strength till the roof is cast and
cured. So temporary props, like those shown in the picture need to be provided at every third length of
Packing of joints,
A continuous G.I. wire is inserted in joints between two panels, all thorough the width of the roof.
The joints are then packed with cement mortar, both from the top as well as the bottom.
The joints between the panels are packed with cement mortar. Note- the provisions for electrical points and
conduiting are to made. On top of this reinforcement of 8mm at .45m c/c is laid and 50mm thk concrete is laid. This
completes the making of an arch panel roof.