Damp Proofing, Belfast

RBAI, Belfast, Northern Ireland
The RBAI, or Inst, as it is locally better known as, is one of the finest examples of late Georgian architecture in Ireland, and dates back to 1810. Stronghold Preservation were requested to survey and carry out treatment for damp and timber rot in the North Wing of the school. The building is constructed from clay brick with solid ground floors, suspended timber first and second floors. Damp and wet rot was discovered on the ground and first floors.

Further Information

Damp Proofing

From our survey, it was discovered that ground levels were higher than finished floor levels, allowing lateral penetration of ground water.  An electro osmotic damp proof course was installed to prevent damp rising up the walls.  A tanking solution (cementitious waterproof membrane) was also applied below the dpc to prevent water transfer below the damp proof course, due to the high ground levels.

Wet rot

Timber plugs were found embedded in the damp masonry, resulting in wet rot.  These timbers were removed, and replaced with masonry.  Timber floor joists bedded in the walls also had high moisture readings.  The joist ends were treated with a boron preservative to help provide a long lasting action against fungal decay (dry rot).