Masonry Design Guidelines
Perform masonry joint repairs for historic buildings in accordance with the best standards of the trade and with careful attention to specify proper mortar mix and color range.
For all historic structures, mortar joint profiles and mortar colors are critical and must be specifically approved by the University. Do not use Portland cement in making such repairs since the resulting strength of the mortar may exceed the strength of the brick.
The Contractor shall prepare sample panels of all proposed exterior materials. The Designer shall recommend samples for the University’s approval. Present all exterior samples for approval at the same time. Mark the approved panels and maintain until completion of the building for comparison with actual
Walls for Animal Quarters
- All walls for animal care facilities shall have a medium dusting of boric acid powder put into the walls for pest control purposes immediately prior to sealing of walls.
- Completely seal all openings for piping, conduit, etc., on both sides of block wall.
- Seal all wall mounted fixtures such as cabinets, towel dispensers, etc., by caulking to prevent pest harborage.
- New Exterior, Load Bearing, Below Grade or Retaining Walls
- For exterior walls, load bearing walls, below grade walls or retaining walls, fully grout all cells.
Clean brick or stone masonry with water and brushes with nonmetal bristles. Diluted detergents may be used if the water is containerized and pumped to the sanitary sewer. Repeated washings are preferred to fewer washings that are too abrasive or chemically laden. Acid content in washing solutions is forbidden.
The Designer and Contractor are to make every effort to prevent infiltration of cleaning water into the storm sewer system during masonry cleaning. This is especially the case when very old masonry units or mortar joints are involved.
Sandblasting of masonry is absolutely prohibited
The Designer shall make every effort to specify “low salt” mortar and to assure that the best workmanship standard of the trade is used to prevent efflorescence. It is the responsibility of the Contractor to remove efflorescence and to correct the work as necessary to avoid further efflorescence.
The use of water-repellent masonry coatings is generally discouraged because of the ongoing maintenance. This is particularly a problem with the high moisture content of walls in historic structures.