Jointing Materials
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Maintenance and Cleaning
| Description
Mortar |
Maintenance and Cleaning | ||||
| Premixed Mortar
Ready mixed lime: sand for mortar For gauging with cement should conform to BS 4721 |
For exposed mortar: maintenance and cleaning refer to facing bricks. | ||||
| Retarded ready to used mortar
Ready to use retarded cement: lime: sand and cement: sand mortar should conform to BS 4721 |
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| Dry pre-packed cementitious mortar mixes
Dry prepacked cementitious mortar mixes should conform to BS 5838-2 |
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| Mixed on site Mortar
With material conform to BS 5628-3: 2001 clause 4.3. |
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| Uninsured, i.e. Mortar with less than above specification | |||||
| Sieve number | Percentage of sand retained (by weight) | ||||
| . | Joints > 6.25mm | Joints < or = 6.25 mm | |||
| . | Max | Min | Max | Min | |
| 4 (4.76 mm) | 0 | 0 | 0 | 0 | |
| 8 (2.38 mm) | 10 | 0 | 0 | 0 | |
| 16 ( 1.19 mm) | 40 | 15 | 15 | 5 | |
| 30 ( 595 microns) | 65 | 35 | 60 | 40 | |
| 50 (297 microns) | 85 | 75 | 85 | 75 | |
| 100 (149 microns) | 98 | 95 | 99 | 95 | |