Running an arch in situ

ACA D WinchesterACA D Winchester 11

Running an arch in situRunning an arch in situ


A opening was made to allow access to the new study


Using a piece of string and a pencil The arch was spun from the centre point

The width of the opening was drawn on the surface of the plasterboard

Plasterboards were fixed over the wall area


Using a pad saw the arch was carefully cut out


Thin coat beads fitted to the arris

Plasterboards have been fixed to the inside of the arch

A coat of thistle bonding has been applied to level up the board, and marry into exiting plaster surface


•A coat of finishing plaster has been applied

•The surfaces have been married together


Top of the arch

”

R=14.5”

D = 29

R = Radius

D = Diameter

Spring line


D = 29

R=14.5”R=14.5”

R = RadiusD = Diameter

R=14.5”

Springing board

Pivot point

Centre for the fishtail gig stick

Dry wall screws used as anchor points


gig stick with fishtail

Template

Stock Slipper

Angle Mould


Pivot pointCentre for the fishtail gig stick

Dry wall screws used as anchor points

The slipper and gig stick are flush with the wall


The mould is built up with three coat of plaster

•The angle mould is passed over the plaster

•Make sure that the mould is flush to the wall and the fishtail is located on the pivot point


The mould is nearly built up


•The semi circular arch is now run

•The springing board has been removed

The mould has been cut of at the spring line

The mould has been cut of at the spring line


Running the styles

Relocate the angle mould on the finished section

When the mould is located fix the running rule with drywall screws

Then plumb down the rule and fix


•Alterations have been to the angle mould

•The gig stick has been removed, and a second slipper has been added

•This will give the mould stability for running up the rule

Twin slipper mould


•The gig stick has been removed, and a second slipper has been added

To gauge the distance between the slippers a piece of the running rule has been used


•Again the mould is built up with three coats of plaster

•The mould is run up and down the running rule


•When the mould is run

•The running rule is removed

•The joint at the spring line is worked with a small tool and joint rule


The same process is repeated on the other style

Running an arch in situ

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