TAN 31- STONEMASONRY MATERIALS AND SKILLS

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TAN 31: STONEMASONRY SKILLS AND MATER1ALS:A methodology to survey sandstone building facades

g) Contour scaling on ashlar - large sheets several millimetres in thickness. Classification: Replacement within twenty years

behind the patch. Classtjication: Decay but will last for more than twenty years. Immediate maintenance (to remove the cement render). (Photo: E Hyslop BCSONERC)

facade. Classification: Will last for more than twenty years

j) Multiple scaling: Surface scaling of lintel. N o immediate structural problem. Classification: Replacement within twenty years

y Nater leakitgjom parapet gurrer nas sarurated stone causing iron staining Classijication :Future replacement fi no maintenance


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