Doors, Exterior, Sliding Door Type, and Metal "By doing so, Edwin had hoped to 'seal' the roof from any further water leakage, but he overlooked the fact that metal and concrete result in an acid reaction. The surface of the roof then cracked and water came all the way through to the metal surface, causing hundreds of rusted holes to form over the decades. By removing the light concrete layer from the roof, we were able to save the original ceiling panels," says Nikolaus.  Photo 6 of 19 in A Sensitively Restored Midcentury House Designed by Pierre Koenig

A Sensitively Restored Midcentury House Designed by Pierre Koenig

6 of 19

"By doing so, Edwin had hoped to 'seal' the roof from any further water leakage, but he overlooked the fact that metal and concrete result in an acid reaction. The surface of the roof then cracked and water came all the way through to the metal surface, causing hundreds of rusted holes to form over the decades. By removing the light concrete layer from the roof, we were able to save the original ceiling panels," says Nikolaus.