AC exterior wall panels rendered after construction to alter appearance and/or encapsulate ACM.

May have occurred at time of construction or in later years.

May have been applied by hand (trowel) or a sprayed on texture coating. Some portable accommodation hire companies had their transportable buildings covered with a non-ACM spray coating en masse during the 1970s.

Requires bulk core sampling to test or observance of damage around edging to identify AC sheeting/visible fibrous material underneath. 

This is not a reference to Hardie’s Stucco moulded AC panelling – refer AC siding sheets information page.

James Hardie instructions circa 1920s-30s provided guidance on the application of a ‘roughcast’ coating over newly installed Fibrolite exterior sheeting:

1.       Erect sheets with reverse side exposed.

2.       Cover all joints, both horizontal and/or perpendicular, with a narrow strip of ½ in. mesh wire netting.

3.       Thoroughly saturate the sheets after erection with water.

4.       Paint the exposed surface of the sheets with one good coat of neat cement and water.

5.       After thoroughly mixing the roughcast, composed of two parts of cement, one part of clean sand, and four parts of coke breeze (by measure), apply in the usual way.