Precast Concrete Data

Jersey

	Average Block Mass (Kg) MC 3%	No per Grab	Mass per Grab (Kg)	Block Density Kg/m³ MC 3%	K Value W/m.K MC 3%	R Value m² K/W MC 3%	Blocks per m²	Blocks per m² Laid on Flat inc Mortar	Blocks per m² Laid Upright inc Mortar	Insitu Blocks % m²	Wall Mass Kg/m² Laid Flat	Wall Mass Kg/m² Laid Upright	Fire Resistance Class	Sound Insulation based on Mass Law Laid on Flat	Sound Insulation based on Mass Law Laid Upright

Standard Dense Block 7.3N/mm²
440 x 75 x 215mm	14.6	88	1285	2257	1.46	0.048	10.57	27.78	9.88	93.43	483	157	A1	56	45
440 x 100 x 215mm	18.7	72	1346	2009	1.46	0.068	10.57	20.20	9.88	93.43	433	201	A1	55	48
440 x 140 x 215mm	26.1	48	1253	1994	1.46	0.096	10.57	14.81	9.88	93.43	430	280	A1	55	51
440 x 100 x 140mm	11.9	108	1285	1981	1.46	0.068	16.23	20.20	14.81	91.26	279	199	A1	51	47
440 x 140 x 140mm	18.4	72	1325	2172	1.46	0.096	16.23	14.81	14.81	91.26	303	303	A1	51	47
Brick 215 x 100 x 065mm	2.7	432	1166	2168	1.45	0.045	46.51	59.26	40.40	86.87	2216	140	A1	48	44
Hollow 440 x 220 x 215mm	32.2	32	1029	1556	0.96	0.229	10.57	9.88	93.43	6.57	4.79	N/A	A1	N/A	N/A

Fairfaced Dense Block 7.3N/mm²
440 x 100 x 215mm	19.1	72	1375	2052	1.40	0.071	10.57	20.20	9.88	93.43	442	206	A1	55	48
440 x 140 x 215mm	26.9	48	1291	2055	1.41	0.099	10.57	14.81	9.88	93.43	442	288	A1	55	51

High Crush Dense Block 10.4N/mm²
440 x 100 x 215mm	19.0	72	1368	2041	1.54	0.065	10.57	20.20	9.88	93.43	440	205	A1	55	48
440 x 140 x 215mm	26.9	48	1291	2055	1.52	0.092	10.57	14.81	9.88	93.43	442	288	A1	55	51

High Crush Dense Block 22.5N/mm²
440 x 100 x 215mm	19.7	72	1418	2116	1.65	0.061	10.57	20.20	9.88	93.43	455	212	A1	55	48
440 x 140 x 215mm	28.4	48	1363	2169	1.64	0.085	10.57	14.81	9.88	93.43	465	303	A1	55	51

Medium Density Block 7.3N/mm²
440 x 140 x 215mm	25.2	48	1152	1925	1.13	0.124	10.57	14.81	9.88	93.43	416	271	A1	54	50

Lightweight Block 7.3N/mm²
440 x 100 x 215mm	14.4	72	1037	1547	0.76	0.132	10.57	20.20	9.88	93.43	340	158	A1	53	45
440 x 140 x 215mm	21.8	48	1046	1665	0.63	0.222	10.57	14.81	9.88	93.43	364	237	A1	53	49

Cellular Euro Block 7.3N/mm²
440 x 140 x 215mm	19.5	48	936	1475	0.96		10.57	14.81	9.88			209	A1

MC = Moisture Content
W/m.K = Thermal Conductivity
m² K/W = Thermal Resistance
Kg/m³ = Kilogrammes per Cubic Metre
Kg/m² = Kilogrammes per Square Metre

This data and information is for guidance purposes only. No responsibility will be accepted for any incorrect interpretation and / or use of the data and information contained within this table.

Updated: April 2025

Guernsey

	Average Block Mass (Kg) MC 3%	No per Grab	Mass per Grab (Kg)	Block Density Kg/m³ MC 3%	K Value W/m.K MC 3%	R Value m² K/W MC 3%	Blocks per m²	Blocks per m² Laid on Flat inc Mortar	Blocks per m² Laid Upright inc Mortar	Insitu Blocks % m²	Insitu Mortar % m²	Wall Mass Kg/m² Laid Flat	Wall Mass Kg/m² Laid Upright	Fire Resistance Class	Sound Insulation based on Mass Law Laid Upright

Standard Dense Block 7.3N/mm²
440 x 100 x 215mm	20.5	54	1080	2149	1.3	0.077	10.57	20.20	9.88	93.43	6.57	461	215	A1	48
440 x 140 x 215mm	28.5	36	1008	2139	1.3	0.108	10.57	14.81	9.88	93.43	6.57	459	299	A1	51
440 x 100 x 140mm	13.0	72	936	2145	1.3	0.077	16.23	20.20	14.81	91.26	8.74	300	214	A1	48
440 x 140 x 140mm	17.8	56	997	2088	1.3	0.108	16.23	14.81	14.81	91.26	8.74	292	292	A1	51
Brick 215 x 100 x 65mm	2.8	208	582	2248	1.42	0.046	46.51	59.26	40.40	86.87	13.13	223	145	A1	44
Trench 300 x 140 x 250mm	22.2	36	799	2145	1.3	0.231	23.81	21.51	12.41	90.32	9.68	642	300	A1	51

Fairfaced Dense Block 7.3N/mm²
440 x 100 x 215mm	18.5	54	999	1988	1.19	0.084	10.57	20.20	9.88	93.43	6.57	429	199	A1	47
440 x 140 x 215mm	27.5	36	990	2101	1.3	0.108	10.57	14.81	9.88	93.43	6.57	452	294	A1	51

High Crush Dense Block 10.4N/mm²
440 x 100 x 215mm	20.2	54	1089	2166	1.42	0.070	10.57	20.20	9.88	93.43	6.57	465	216	A1	51
440 x 140 x 215mm	29.0	36	1062	2253	1.42	0.099	10.57	14.81	9.88	93.43	6.57	475	309	A1	54

High Crush Dense Block 22.5N/mm²
440 x 100 x 215mm	19.5	54	1053	2095	1.3	0.077	10.57	20.20	9.88	93.43	6.57	450	210	A1	48
440 x 140 x 215mm	29.5	36	1044	2253	1.42	0.099	10.57	14.81	9.88	93.43	6.57	482	314	A1	52

Lightweight Block 7.3N/mm²
440 x 100 x 215mm	15.4	54	831	1680	0.63	0.159	10.57	20.20	9.88	93.43	6.57	367	171	A1	46
440 x 140 x 215mm	21.9	36	788	1680	0.63	0.222	10.57	14.81	9.88	93.43	6.57	367	239	A1	49

MC = Moisture Content
W/m.K = Thermal Conductivity
m² K/W = Thermal Resistance
Kg/m³ = Kilogrammes per Cubic Metre
Kg/m² = Kilogrammes per Square Metre

This data and information is for guidance purposes only. No responsibility will be accepted for any incorrect interpretation and / or use of the data and information contained within this table.

Updated: April 2025