DIVISION 4 - MASONRY
04010 Masonry Removal, Repair, and Reuse
1.0 In renovation projects, and for additions to existing brick buildings, the removal of bricks shall be carefully executed, in order to re-use the same units whenever possible. When replacement with non-original units is necessary, only bricks matching the existing units shall be used.
2.0 Masonry joint repairs for historic buildings shall be made in accordance with the best standards of the trade and with careful attention to specify proper mortar mix and color range.
3.0 For older structures, mortar joint profiles and mortar colors are critical and must be specifically approved by the University. Portland cement may not be used in making such repairs since the resulting strength of the mortar may well exceed the strength of the brick. The University prefers to replace failed mortar joints rather than damaged bricks if one or the other is to fail in the future.
04200 Unit Masonry
1.0 The Contractor shall prepare sample panels of all proposed exterior materials. The Designer shall recommend samples for the University's approval. All exterior samples shall be presented for approval at the same time. The approved panels shall be marked and maintained until completion of the building for comparison with actual construction.
2.0 The designer shall specify single source responsibility for all masonry units and masonry materials.
3.0 The designer shall insure that cold weather masonry specifications and precautions are adhered to.
04510 Masonry Cleaning
1.0 Care shall be taken during the erection of masonry to keep the masonry and adjacent surfaces clean. Wall surfaces shall be cleaned as the work progresses, and to the extent practical, masonry shall be cleaned on the same day in which it is laid. Excess mortar shall be rubbed off the wall face when the mortar is sufficiently dry so that it will not smear and form a scum on the face of the masonry.
2.0 Brick or stone masonry shall be cleaned with water and brushes with nonmetal bristles; diluted detergents may be used. Repeated washing are preferred to fewer washing that are too abrasive or chemically laden. Acid content in washing solutions is forbidden. The Designer and Contractor are to be especially careful with regard to the possible hazard of infiltration during masonry cleaning. This is especially the case when very old masonry units or mortar joints are involved.
3.0 Sandblasting of masonry is absolutely prohibited.
4.0 Every effort must be made by the Designer to specify "low salt" mortar and to assure that the best workmanship standard of the trade are used in an effort to prevent efflorescence. It shall be the responsibility of the Contractor to remove efflorescence and to correct the work as necessary to avoid further efflorescence.
5.0 The use of water-repellent masonry sealants is required on all brick exterior walls after they have cured for at least 30 days. The sealant shall be Life Guard brand or equal applied in accordance to manufacture's specifications. This product offers a fifteen year warranty which will be required in the project close out documents. Before any water-proofing agents are applied to exterior masonry, all glass, roofing membrane, metals, and so forth should be covered and protected in accordance with manufacture's recommendations.
6.0 For brick facades, the Designer shall specify and enforce an acceptable inspection method for the cavity areas at weep hole flashing to ensure mortar droppings do not obstruct moisture paths to the weep holes.
