Encyclopedia of Historic Masonry Restoration

Damp Proof Course

In masonry construction, damp proof courses (also commonly referred to as DPC’s) are added to prevent rising damp from continuing above or significantly above the building footing and foundation.  Ground water at or near a building footing will permeate into the building footing when left… Read More »Damp Proof Course

Dome strainer, rooftop

Many of the buildings in Washington DC with commercial style flat roofs do not have internal drains. Instead, they have rear terminations which feed into guttering and downspout systems. However, flat roofs that are larger or wider than a typical city rowhome layout may use… Read More »Dome strainer, rooftop

Drip edge

Drip edges and flashings are impermeable or low-permeability materials, concentrically built to cover exposed areas susceptible to water entry. Fascia and rake boards terminate in a way to overlap the joints between the roof and brick masonry walls. The display board shown in the photo… Read More »Drip edge

Drip trails

On the surface of exterior building facades, at some places you can see signs of drip and leak trails.   Rainwater which runs over a roof and through guttering systems, for example, will generally have a bit of dirt and dust in the rain water.  These… Read More »Drip trails