Resources | Accreditations, Size & Tolerances Brick Guides - Clay&Co
Resources
Accreditations
Quality
NSAI Certificate I.S. EN ISO 9001:2015
We are committed to quality through our I.S. EN ISO 9001:2015 certification, awarded by the NSAI. This internationally recognised standard ensures consistent performance, compliance, and continual improvement across all operations.
Environment
NSAI Certificate I.S. EN ISO 14001:2015
We are dedicated to environmental responsibility, certified to I.S. EN ISO 14001:2015 by the NSAI. This standard guides our efforts to minimize environmental impact, comply with regulations, and continually improve our environmental performance.
Health & Safety
NSAI Certificate I.S. ISO 45001:2018
We prioritise health and safety through our I.S. ISO 45001:2018 certification, awarded by the NSAI. This standard supports our commitment to providing a safe, healthy workplace and continuously improving our occupational health and safety performance.
Publications
Corium Brick Cladding System
Mechanically fixed, A1 non-combustible, natural clay brick by Wienerberger.
Good Site Practice & Workmanship
The document outlines essential best practices for delivering, handling, laying, protecting, and cleaning bricks to ensure consistent quality and durable brickwork on construction sites.
Size and Tolerance Guides
BS EN 771-1 requires brick manufacturers to state brick length, width and height in millimetres, along with the tolerance category the product meets—T2 (smallest deviation), T1 (largest deviation), or Tm (manufacturer-declared). Tolerance is defined as the difference between the stated work size and the mean actual size. If tolerance concerns arise on-site, users should consult the product data sheet, then carry out a site test by sampling 10 bricks from at least 6 packs, cleaning them, aligning them uniformly, measuring the total dimension, and dividing by 10 to obtain the mean. This result is then compared with the declared tolerance ranges provided in the tables. Additional “range” limits specify how far apart the smallest and largest individual measurements may be within the sample.
Standard Format
Declared size | T1 Lower & Upper (mm) | Tolerances (mm) | T2 Lower & Upper (mm) | Tolerances (mm) | Lower Limit (R1) | Upper Limit (R2) |
|---|---|---|---|---|---|---|
40 | 37 - 43 | ± 3 | 38 - 42 | ± 2 | 4 | 2 |
50 | 47 - 53 | 3 | 48 - 52 | ± 2 | 4 | 2 |
65 | 62 - 68 | 3 | 63 - 67 | ± 2 | 5 | 2 |
68 | 65 - 71 | 3 | 66 - 70 | 2 | 5 | 3 |
73 | 70 - 76 | 3 | 71 - 75 | 2 | 5 | 3 |
80 | 76 - 84 | 4 | 78 - 82 | 2 | 5 | 3 |
90 | 86 - 94 | 4 | 88 - 92 | 2 | 6 | 3 |
100 | 96 - 104 | 4 | 97 - 103 | ± 3 | 6 | 3 |
102 | 98 - 106 | 4 | 99 - 105 | ± 3 | 6 | 3 |
140 | - | - | - | - | 7 | 4 |
190 | 184 - 196 | ± 6 | 186 - 194 | 4 | 8 | 4 |
210 | 204 - 216 | ± 6 | 206 - 214 | 4 | 9 | 4 |
215 | 209 - 221 | ± 6 | 211 - 219 | ± 4 | 9 | 4 |
225 | 219 - 231 | 6 | 221 - 229 | ± 4 | - | - |
227 | 221 - 233 | 6 | 223 - 231 | ± 4 | 9 | 4 |
240 | 234 - 246 | 6 | 236 - 244 | ± 4 | 9 | 4 |
270 | 264 - 276 | 6 | 266 - 274 | 4 | 10 | 5 |
275 | 269 - 281 | 6 | 271 - 279 | 4 | 10 | 5 |
290 | 283 - 297 | ± 7 | 271 - 279 | 4 | - | - |
Long Format
Declared size | Declared Limit (Rm) | Tm Lower & Upper (mm) | Tolerances (mm) |
|---|---|---|---|
40 | 4 | 37 – 43 | ± 3 |
100 | 5 | 96 – 104 | ± 4 |
115 | 6 | 111 – 119 | ± 4 |
290 | 8 | 284 – 296 | ± 6 |
327 | 9 | 320 – 334 | ± 7 |
490 | 13 | 481 – 499 | ± 9 |