Copyright: RIBA Library Drawings Collection

New inlays had to be created for 33 of the 56 drawings by Palladio before they could be mounted ready for the Palladio 500 exhibition because their support paper had deteriorated.

Pared or strip inlay methods were used in most instance. J.P Inlay paper was chosen, a 100% acid-free cotton mould-made paper that does not distort or place strain on the original drawing.

Pared and strip inlay methods

The pared inlaid approach meant that the J.P inlay paper was bevelled and pared down to create a window, and approximately 4mm of the drawing's edge was pasted so that the drawing sat in the bevel.

For the strip inlaid method the aperture was cut and the drawing was placed up against the inlay paper which thus acted as a false margin. The drawing and inlay papers were joined using narrow strips of Japanese paper, which is light and strong.

With either of these methods neither side of the paper is obscured, and the drawing does not have to be handled. This reduces the risk of physical damage.

It is not always possible to inlay drawings when they are very large and if the paper is heavy. In these instances, float mounting can be used.