Exterior Plaster Problems
Help, the exterior plaster on my walls is blistering and falling off. What is wrong?
Many older homes were not equipped with weep screed which is a sheet metal flashing found at the transition of the bottom plate of your walls (usually 2x4 mudsill) and the top of the foundation (slab or footing). The weep screed serves four purposes:
- A plaster ground which helps to gauge the thickness of the plaster as it is applied.
- A waterproof flashing covering the gap between the foundation and the bottom plate of the wall.
- A means to allow the plaster to release moisture that has been absorbed, hence the term “weep” screed.