Approved by Cabinet of Ministers of 21 April 1998, the regulations No 139 Latvian et seq of the LBN 205-97 "masonry and reinforced masonry construction design rules" table 3 bricks or stones mark (R1) calculates the compressive resistance R, MPA (kgf/cm2) all the way to the brick, as well as ceramic stones (with a vertical cavity spraugveid, no bigger than 12 mm) wall with a row height of 50-150 mm, using heavy mortars with the following brands (R2) mortar strength 200 150 100 75 50 25 10 4 0.2 (2) zero (3.9 300 39) 3.6 (36) 3.3 (33) 3.0 (30) 2.5 2.8 (28) (25) (22) 1.8 2.2 (18) 1.7 (17) 1.5 (15) 250 (36) 3.6 3.3 (33) 3.0 (30) 2.5 2.8 (28) (25) (22) 1.9 2.2 (19) (16) 1.5 1.6 (15) 1.3 (13) 200 (32) 3.0 3.2 (30) 2.5 2.7 (27) (25) (22) 1.8 2.2 (18) 1.4 1.6 (16) (14) (13) 1.3 1.0 (10) 150 2.6 (26) 2.2 2.4 (24) (22) (20) 1.8 2.0 (18) 1.3 1.5 (15) (13) 1.0 1.2 (12) (10)
0.8 (8) 125-2.0 2.2 (22) (20) (21) 1.7 1.9 (17) 1.4 (14) 1.1 1.2 (12) (11) (9) 0.7 0.9 (7) 100-2.0 (20) 1.7 1.8 (18) (17) (15) 1.3 1.5 (13) 0.9 1.0 (10) (9) (8) 0.8 0,6 (6) — 75 — 1.5 1.4 (14) (15) (13) 1.3 1.1 (11) 0,7 0.9 (9) (7) (6) 0.5 0.6 (5) 50 — 1.1 1.0 (10) (11) (9) 0.7 0.9 (7) 0.5 0.6 (6) (5) (3.5) 35:0.35-0.8-0.9 (9) (8) (7) (0.6 0.7 6) (4.5) 0.4 0.45 (4) 0.25 (2.5) Note.
Calculates the compressive resistance of the wall, using a brand from 4 to 50 mortar must be reduced using the following multiplication factors: 0.85-wall, which is a rigid cement masonry mortar (lime and clay additives) and a light mortar 3 months of age;
0.90-wall, constructed with cement mortar (lime and clay fillers) with organic compound plasticisers.
High class wall where the mortar is completed after the weld frame adjusting the view of Java with the band and, reduce compressive resistance calculation is necessary. The project must be specified in Java mark a conventional wall and also increased the quality of the wall.
 
table 4 stones mark the concrete class calculates the compressive resistance R, MPA (kgf/cm2) wall of concrete all the way (full) body lielblok and from natural stone blocks (or sawed away smoothly carved) with a wall round the height of 500-1000 mm mortar mark at zero strength Java 200 150 100 75 50 25 10 1 2 3 4 5 6 7 8 9 10-1000 (179) 17.5 17.9 (175) (171) 17.1 16.8 (168) 16.5 (165) 15.8 (158) 11.3 14.5 (145) (113), 800 (152) 15.2
14.8 (148) 14.4 (144) (141) 13.8 14.1 (138) 13.3 (133) (123) 9.4 12.3 (94): 12.8 (128) 600 (124) 12.0 12.4 (120) (117) 11.7 11.4 (114) (109) 10.9 9.9 (99) 7.3 (73): 11.1 (111) 500 10.7 (107) (103) 10.3 10.1 (101) 9.8 (98) 9.3 (93) (87) 8.7 6.3 (63) (B) (93) 30 400 9.3 9.0 (90) (87) 8.7 8.4 (84) 7.7 8.2 (82) (77) (74) 7.4 5.3 (53) B 25 300 (75) 7.5 7.2 (72) 6.9 (69) (67) 6.7 6.5 (65)
(62) 5.7 6.2 (57) 4.4 (44) 20 250 B (67) 6.7 6.4 6.1 (64) (61) (59) 5.7 5.9 (57) (54) 5.4 4.9 (49) (38) (B) 3.8 5.4 (54) 5.2 15 200 (52) 4.9 5.0 (50) (49) (47) 4.7 4.3 (43) 4.0 (40) 3.0 (30) (B) 150 (46) 4.4 4.6 12.5 (44) 4.2 4.1 (41) (42) (39) 3.7 3.9 (37) 2.4 3.4 (34) (24) (B) 7.5-3.3 (33) 100 (31) 2.9 3.1 (29) 2.7 2.6 (26) (27) (24) 2.4 1.7 (17)
(B) 5 75 — 2.3 2.2 (22) (23) (24) 2.0 2.1 (20) 1.8 (18) (13) (B) 3.5 50 1.3-1.6-1.7 (17) (16) (15) 1.4 1.5 (14) 1.2 (12) 0.85 (8.5) — — — — 35 2.5 B 1.1 1.0 (10) (11) (9) 0.9 0.6 (6) (B) 2 25 — — — — 0.8 0.9 (9) (8) (7) 0.5 0.7 (5) notes.
1. Calculate the compressive resistance of the wall at a height of more than 1000 mm, having at the table by a factor of 4 1.1.2. Natural stone block stamps take depending on the compressive robežpretestīb MPA (kgf/cm2) reference model — dice.
3. Calculate the compressive resistance of the wall of concrete and natural stone lielblok blocks, if weld completed at the frame, align and view with the band (a project), allowed to take after 4. table by a factor of 1.2.
 
table 5 Calculation of compressive resistance R, MPA (kgf/cm2) wall of full (continuous) concrete, ģipšbeton and natural or smooth face carved stones with a wall round the height of 200-300 mm stones make Java mark at mortar strength 200 150 100 75 50 25 10 4 0.2 (2) zero (130) 1 2 3 4 5 6 7 8 9 10 11 1000 13.0 12.5 (125) 12.0 (120) (115) 11.0 11.5 (110) 10.5 (105) (95) 9.5 8.5 (85) (83) 8.3 8.0 (80) 800
11.0 (110) 10.5 (105) 10.0 (100) (95) 9.5 9.0 (90) (85) 8.5 8.0 (80) 6.8 7.0 (70) (68) (65) 6.5 9.0 600 (90) (85) 8.5 8.0 (80) 7.8 (78) (75) 7.0 7.5 (70) 5.5 6.0 (60) (55) (53) 5.0 5.3 (50) 500 (78) 7.3 7.8 (73) 6.9 (69) (67) 6.7 6.4 (64) 6.0 (60) 5.3 (53) 4.8 (4.8) (46) 4.3 4.6 (43) 6.5 6.0 400 (65) (60) (58) 5.8 5.5 (55) 5.0 5.3 (53) (50) (45) 4.0 4.5 (40) (3.8 38) 5.8 3.5 (35) 300 (58) 4.9 (49) 4.5 4.7 (47) (45) (43) 4.0 4.3 (40) (37) 3.7 3.3 (33) (34) 2.8 3.1 (28) 200 4.0 (40) 3.6 3.8 (38) (36) (35) 3.3 3.5 (33) 3.0 (30) 2.8 (28) 2.3 2.5 (25) (25) (20) 2.0 3.3 3.1 150 (33) (31) (29) 2.9 2.8 2.6 (28) (26) (27) 2.2 2.4 (22) (20) 1.8 2.0 (18) 1.5 (15) 100 (30) 2.4 2.5 (24) (23) 2.3 2.2 2.0 (22) (20) (18) (1.7 1.8 17) 1.5 (15) (13) 1.3 1.0 (10) — 75 — 1.9 (19) 1.7 1.8 (18) (17) (15) 1.4 1.5 (14) 1.1 1.2 (12) (11) (8) 50-0.8-1.5 1.4 (14) (15) (13) 1.3 1.2 (12) 0.9 1.0 (10) (9) (8) 0.6 0.8 (6) 35 — — — — 1.0 (10) 0.95 (9.5) 0.7 0.85 (8.5) (7) (6) 0.6 0.45 (4.5) 25 — — — — (8) 0.75 0.8 (7.5) (6.5) 0.55 0.65 (5.5) 0.5 (5) 0.35 (3.5) 15 — — — — — (5) 0.45 0.5 (4.5) 0.38 (3.8) 0.35 (3.5) 0.25 (2.5) notes.
1. Calculate the compressive resistance of the wall from the full (continuous) slag concrete rocks obtained by burning Brown coal, and a mixed take by table 5 coefficient of 0.8.2. Ģipšbeton stones wall laying is allowed only if the walls lifetime is 25 years; In addition, the compressive resistance of the calculation of the wall taken by table 5 with the factor 0.8 0.7 wall outer wall and inner walls.
3. Calculate the compressive resistance of the wall of concrete and natural stone with mark of 150 and above, with flat surfaces and tolerance of sizes that do not exceed ± 2 mm, thickness of seams with mortar, not more than 5 mm, which are filled in by using the cement paste or glue composition, allowed to take after table 5 with the factor 1.3.