* Featured image by Sara Stathas, for the Wall Street Journal.

We’ve adopted a new method when visitors visit: instead of dashing through the Sleeping Porch, we’re now closing the porch door and pausing in the space to consider the Pebble-Dash. It’s worth taking the time to take it in.

It is said that Wright first saw and appreciated Pebble-Dash (also called RoughCast) on a visit to San Diego and thought it might work well for the exteriors of American System Built Homes. The method was popular in maritime climes and praised for low cost, good looks, and uniform durability.  Pebble-Dash starts with plaster applied to brick or lath, and while wet, multi-colored Pebbles are Dashed onto the surface. Colors are what you happen to get from the quarry at the time. Here, we see grey, tan and black quartzite, granite and sparkly biotite.

It isn’t clear that Pebble-Dash was a good idea for frame construction in Wisconsin. Experts tell us that the exteriors of the houses on the Burnham Block were all recovered within 20 years of construction and there is photographic evidence that this house had shingles over the original surface by about 1935 (fourteen short years after the first owners moved in), presumably due to rapid deterioration. One might surmise that Pebble-Dash over brick becomes a uniformly mineral-based wall, contracting and expanding at about the same pace, and therefore, staying together. However, Pebble Dash over wood lath might crumble in freezing winters since wood and rock don’t dance well together. Wright may have specified Byrkit Lath to try to prevent trouble, but it doesn’t appear he was successful.

Regardless, the unpainted Pebble-Dash in the Elizabeth Murphy House is one of the last two examples of the original exterior of an American System Built House, anywhere. (The other is the Delbert Meier House in Iowa.) This sleeping porch — once open to the outside — was converted to an enclosed and heated space (probably in the 30’s) and the Pebble-Dash in it has been preserved in almost original condition. The ceiling is spectacular:

Thus, the deliberate pause to take it in. When you’re in this space, you’re in history. A history of trial and error and experimentation that would’ve been lost and forgotten, if the clocks had not been paused about 80 years ago.