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Product Code : FACTORY01

Producer : NP

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Details

Load Tables / Носимоспособност

NRP3 · Three-Rib Roof Panel

Distributed load capacity and L/200 limit values for the three-rib roof panel. The catalogue gives no value for 40 and 50 mm thicknesses at the 400 span; those cells are left empty.

Variants	NRP3 SS · NRP3 STS · NRP3 STS-FR
Insulation thickness	40 · 50 · 60 · 70 · 80 · 100 · 120 mm
Thermal conductivity	PUR-PIR 0.022 W/mK · Hybrid 0.045 W/mK · Rock wool 0.045 W/mK
Fire class	To TS EN 13501-1, polyurethane B s2 d0 · rock wool A2 s1 d0
Density	Polyurethane 40 kg/m³ (±2) · Rock wool 100 kg/m³ (±10%) · Core edge 130 kg/m³ (±10%)

The figures above are taken from the printed catalogue. The U value and heat loss calculators on this site use the declared thermal conductivity: 0.022 W/mK for polyurethane, 0.045 W/mK for mineral wool.

NRP3 SS Distributed load (P = kg/m²)

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²)
40 mm	0.50	0.40	413	265	182	132	102	76	57
40 mm	0.50	0.50	432	273	193	143	111	83	61
50 mm	0.50	0.40	446	279	204	155	120	89	64
50 mm	0.50	0.50	462	286	217	166	129	97	69
60 mm	0.50	0.40	477	294	226	177	138	102	71
60 mm	0.50	0.50	489	300	241	189	148	110	76
70 mm	0.50	0.40	508	312	249	199	156	115	78
70 mm	0.50	0.50	523	327	266	212	167	124	83
80 mm	0.50	0.40	539	423	272	223	174	127	85
80 mm	0.50	0.50	554	438	289	236	186	137	91
100 mm	0.50	0.40	596	452	317	269	210	153	99
100 mm	0.50	0.50	615	469	338	281	223	164	105
120 mm	0.50	0.40	662	482	362	314	246	178	113
120 mm	0.50	0.50	678	499	387	328	261	190	120

NRP3 STS · NRP3 STS-FR Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
40 mm	0.50	0.40	290	169	122	94	70	59	—
40 mm	0.50	0.50	308	186	134	107	79	63	—
50 mm	0.50	0.40	332	202	142	119	86	67	—
50 mm	0.50	0.50	348	217	156	124	94	71	—
60 mm	0.50	0.40	374	231	164	141	102	76	52
60 mm	0.50	0.50	389	248	178	141	108	79	57
70 mm	0.50	0.40	412	262	186	160	119	83	63
70 mm	0.50	0.50	430	279	200	158	123	89	65
80 mm	0.60	0.50	453	294	208	177	135	94	67
80 mm	0.60	0.60	470	310	222	175	137	99	70
100 mm	0.60	0.50	534	358	252	206	166	103	73
100 mm	0.60	0.60	550	372	267	210	166	107	77
120 mm	0.60	0.50	613	419	296	230	185	113	81
120 mm	0.60	0.60	632	435	312	245	196	118	87

NRP5 · Five-Rib Roof Panel

Distributed load capacity and L/200 limit values for the five-rib roof panel. The values apply to the panel family as a whole; for project-specific values, consult our technical team.

Variants	NRP5 SS · NRP5 STS · NRP5 STS-FR
Insulation thickness	40 · 50 · 60 · 70 · 80 · 100 · 120 mm
Thermal conductivity	PUR-PIR 0.022 W/mK · Hybrid 0.045 W/mK · Rock wool 0.045 W/mK
Fire class	To TS EN 13501-1, polyurethane B s2 d0 · rock wool A2 s1 d0
Density	Polyurethane 40 kg/m³ (±2) · Rock wool 100 kg/m³ (±10%) · Core edge 130 kg/m³ (±10%)

NRP5 SS Distributed load (P = kg/m²)

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²)
40 mm	0.50	0.40	702	421	274	178	116	82	61
40 mm	0.50	0.50	715	442	287	187	121	91	72
50 mm	0.50	0.40	749	463	301	196	127	98	76
50 mm	0.50	0.50	766	486	316	206	134	107	83
60 mm	0.50	0.40	797	510	331	215	140	116	88
60 mm	0.50	0.50	818	523	334	226	143	124	96
70 mm	0.50	0.40	844	536	348	232	150	129	102
70 mm	0.50	0.50	870	562	351	238	163	141	112
80 mm	0.50	0.40	892	575	364	243	167	149	122
80 mm	0.50	0.50	922	589	382	249	183	157	130
100 mm	0.50	0.40	986	617	401	261	206	183	153
100 mm	0.50	0.50	1026	648	432	274	223	191	161
120 mm	0.50	0.40	1082	678	441	312	242	217	183
120 mm	0.50	0.50	1134	712	475	326	261	226	194

NRP5 STS · NRP5 STS-FR Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
40 mm	0.50	0.40	428	237	162	131	84	75	52
40 mm	0.50	0.50	466	262	182	143	95	78	56
50 mm	0.50	0.40	504	287	202	155	104	83	59
50 mm	0.50	0.50	542	313	222	166	113	86	62
60 mm	0.50	0.40	580	339	242	178	123	91	63
60 mm	0.50	0.50	618	365	262	189	132	94	66
70 mm	0.50	0.40	654	392	284	201	142	96	67
70 mm	0.50	0.50	687	419	306	212	151	99	70
80 mm	0.60	0.50	713	435	318	224	161	100	73
80 mm	0.60	0.60	739	451	329	235	170	103	76
100 mm	0.60	0.50	757	488	358	259	189	110	80
100 mm	0.60	0.60	774	525	386	282	208	113	83
120 mm	0.60	0.50	783	533	392	287	227	121	87
120 mm	0.60	0.60	790	547	418	301	246	124	92

NRP7 · Seven-Rib Roof Panel

Distributed load capacity and L/200 limit values for the seven-rib roof panel. The catalogue prints the outer sheet value on the 120 mm row as "0.5"; it is written here as 0.50, and the value is the same.

Variants	NRP7 SS · NRP7 STS · NRP7 STS-FR
Insulation thickness	40 · 50 · 60 · 70 · 80 · 100 · 120 mm
Thermal conductivity	PUR-PIR 0.022 W/mK · Hybrid 0.045 W/mK · Rock wool 0.045 W/mK
Fire class	To TS EN 13501-1, polyurethane B s2 d0 · rock wool A2 s1 d0
Density	Polyurethane 40 kg/m³ (±2) · Rock wool 100 kg/m³ (±10%) · Core edge 130 kg/m³ (±10%)

NRP7 SS Distributed load (P = kg/m²)

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²)
40 mm	0.50	0.40	772	463	301	196	128	90	67
40 mm	0.50	0.50	786	486	316	205	133	100	79
50 mm	0.50	0.40	824	509	331	216	140	109	84
50 mm	0.50	0.50	843	535	348	227	147	118	91
60 mm	0.50	0.40	877	561	364	236	154	127	97
60 mm	0.50	0.50	899	575	367	249	157	136	106
70 mm	0.50	0.40	928	590	382	255	165	142	112
70 mm	0.50	0.50	957	618	386	262	179	155	123
80 mm	0.50	0.40	981	632	400	267	184	164	134
80 mm	0.50	0.50	1014	648	420	274	201	173	143
100 mm	0.50	0.40	1085	678	441	287	227	201	168
100 mm	0.50	0.50	1129	713	475	301	245	210	177
120 mm	0.50	0.40	1190	746	485	343	266	239	201
120 mm	0.50	0.50	1247	783	523	359	287	249	213

NRP7 STS · NRP7 STS-FR Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
40 mm	0.50	0.40	471	261	178	144	92	83	57
40 mm	0.50	0.50	512	288	201	157	105	86	62
50 mm	0.50	0.40	554	316	223	171	114	91	65
50 mm	0.50	0.50	596	344	245	183	124	95	68
60 mm	0.50	0.40	638	373	267	196	135	101	70
60 mm	0.50	0.50	680	402	289	208	145	103	73
70 mm	0.50	0.40	719	431	312	221	156	106	75
70 mm	0.50	0.50	756	461	334	234	167	109	77
80 mm	0.60	0.50	784	479	350	246	178	111	80
80 mm	0.60	0.60	813	496	362	259	187	114	84
100 mm	0.60	0.50	833	537	394	285	208	121	88
100 mm	0.60	0.60	851	578	425	310	229	124	91
120 mm	0.60	0.50	861	586	431	316	250	133	96
120 mm	0.60	0.60	869	602	460	331	270	137	101

NWP0 SSDV · Exposed-Fix Wall Panel

Distributed load capacity and L/200 limit values for the exposed-fix wall panel.

Two values in the catalogue are printed inconsistently with their neighbours and are reproduced here as printed: on the SSDV 70 mm / 0.40 inner sheet row, the 400 span reads 61, and on the STSDV 50 mm / 0.40 inner sheet row, the 350 span reads 46. Both were read again at 380 dpi and confirmed legible; the values themselves should be checked with the factory.

Variants	NWP0 SSDV · NWP0 STSDV · NWP0 STSDV-FR
Insulation thickness	40 · 50 · 60 · 70 · 80 · 100 · 120 · 150 mm
Thermal conductivity	PUR-PIR 0.022 W/mK · Hybrid 0.045 W/mK · Rock wool 0.045 W/mK
Fire class	To TS EN 13501-1, polyurethane B s2 d0 · rock wool A2 s1 d0
Density	Polyurethane 40 kg/m³ (±2) · Rock wool 100 kg/m³ (±10%) · Core edge 130 kg/m³ (±10%)

NWP0 SSDV Distributed load (P = kg/m²)

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²)
40 mm	0.50	0.40	212	161	123	98	78	66	50
40 mm	0.50	0.50	240	174	134	108	89	74	55
50 mm	0.50	0.40	277	211	162	127	101	88	64
50 mm	0.50	0.50	290	231	179	139	113	98	70
60 mm	0.50	0.40	344	260	202	156	123	110	77
60 mm	0.50	0.50	367	287	220	173	138	121	85
70 mm	0.50	0.40	410	311	241	186	146	132	61
70 mm	0.50	0.50	444	343	265	205	162	144	99
80 mm	0.50	0.40	478	361	280	215	169	155	105
80 mm	0.50	0.50	520	399	304	236	186	168	114
100 mm	0.50	0.40	611	461	359	273	215	198	133
100 mm	0.50	0.50	671	508	392	300	236	216	145
120 mm	0.50	0.40	746	565	436	334	261	242	160
120 mm	0.50	0.50	828	622	478	367	285	264	174

NWP0 STSDV · NWP0 STSDV-FR Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
40 mm	0.50	0.40	165	129	105	89	73	55	—
40 mm	0.50	0.50	207	162	134	108	89	66	52
50 mm	0.50	0.40	248	194	155	126	101	46	59
50 mm	0.50	0.50	295	232	187	148	120	88	66
60 mm	0.60	0.50	346	260	203	163	129	97	73
60 mm	0.60	0.60	384	301	240	190	150	112	82
70 mm	0.60	0.50	423	325	253	201	157	118	87
70 mm	0.60	0.60	474	372	292	230	180	135	97
80 mm	0.60	0.50	503	390	302	239	185	139	101
80 mm	0.60	0.60	562	442	345	270	211	158	112
100 mm	0.60	0.50	677	522	401	312	241	183	130
100 mm	0.60	0.60	741	584	450	352	271	205	143
120 mm	0.60	0.50	842	654	502	388	298	224	158
120 mm	0.60	0.60	921	729	558	433	332	251	173

NWP0 · Wall Panel

Distributed load capacity and L/200 limit values for the concealed-fix wall panel. The technical properties extend to 150 mm thickness; the load table in the catalogue ends at 120 mm.

Variants	NWP0 SS · NWP0 STS · NWP0 STS-FR
Insulation thickness	40 · 50 · 60 · 70 · 80 · 100 · 120 · 150 mm
Thermal conductivity	PUR-PIR 0.022 W/mK · Hybrid 0.045 W/mK · Rock wool 0.045 W/mK
Fire class	To TS EN 13501-1, polyurethane B s2 d0 · rock wool A2 s1 d0
Density	Polyurethane 40 kg/m³ (±2) · Rock wool 100 kg/m³ (±10%) · Core edge 130 kg/m³ (±10%)

NWP0 SS Distributed load (P = kg/m²)

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²)
40 mm	0.50	0.40	249	189	145	116	92	78	59
40 mm	0.50	0.50	282	205	158	127	104	87	65
50 mm	0.50	0.40	326	248	191	149	119	104	75
50 mm	0.50	0.50	341	272	211	164	133	115	82
60 mm	0.50	0.40	405	306	237	184	145	130	91
60 mm	0.50	0.50	432	338	259	203	162	143	100
70 mm	0.50	0.40	483	366	283	219	172	156	107
70 mm	0.50	0.50	522	404	312	241	191	170	117
80 mm	0.50	0.40	562	425	329	253	199	182	123
80 mm	0.50	0.50	612	469	358	278	219	198	134
100 mm	0.50	0.40	719	542	422	322	253	233	156
100 mm	0.50	0.50	789	598	461	353	278	254	170
120 mm	0.50	0.40	878	665	513	392	307	285	188
120 mm	0.50	0.50	974	732	562	430	335	310	205

NWP0 STS · NWP0 STS-FR Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	Outer sheet	Inner sheet	100	150	200	250	300	350	400
			Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
40 mm	0.50	0.40	194	152	123	105	86	65	52
40 mm	0.50	0.50	243	190	158	127	105	78	61
50 mm	0.50	0.40	292	228	182	148	119	89	69
50 mm	0.50	0.50	347	273	220	174	141	104	78
60 mm	0.60	0.50	407	306	239	192	152	114	86
60 mm	0.60	0.60	452	354	282	223	177	132	96
70 mm	0.60	0.50	498	382	297	236	185	139	102
70 mm	0.60	0.60	558	438	344	271	212	159	114
80 mm	0.60	0.50	592	459	354	281	218	164	119
80 mm	0.60	0.60	661	520	406	318	248	186	132
100 mm	0.60	0.50	796	614	472	367	284	215	153
100 mm	0.60	0.60	872	687	529	414	319	241	168
120 mm	0.60	0.50	990	769	589	456	350	264	186
120 mm	0.60	0.60	1083	857	656	509	390	295	203

Trapezoidal 37/1000 · Five-Rib

Distributed load capacity of the five-rib trapezoidal sheet. Cover width 1000 mm, rib height 37 mm.

Trapez 37/1000 Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	100	150	200	250	300
	Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
0.5 mm	400	180	100	65	44
0.6 mm	490	220	130	80	55
0.7 mm	580	260	150	93	64
0.8 mm	665	305	170	108	75
0.9 mm	750	350	190	123	86
1 mm	835	395	210	138	97

Trapezoidal 24/1000 · Seven-Rib

Distributed load capacity of the seven-rib trapezoidal sheet. Cover width 1000 mm, rib height 24 mm.

Trapez 24/1000 Distributed load (P = kg/m²) · L/200 limit value

Insulation thickness	100	150	200	250	300
	Span (cm) · Distributed load (P = kg/m²) · L/200 limit value
0.5 mm	382	170	83	43	25
0.6 mm	500	223	110	56	33
0.7 mm	630	280	139	72	42
0.8 mm	790	343	168	87	50
0.9 mm	950	406	197	102	58
1 mm	1110	469	226	117	66

Connection Details / Данни за връзката

Roof and Wall Panel Joint Detail

ROOF AND PANEL

Roof Panel Side Lap Detail

Roof Panel Joint Detail

Wall External Corner Flashing Detail

Valley Gutter Detail

Concealed Drainage Detail Without a Gutter

Membrane Monoblock Roof Panel and Parapet Detail

Custom Formed Upper Ridge Detail

CERTIFICATED

CERTIFICATED

Design and Specification

Most of the installation is decided in the design, not on site. This section and those that follow adapt the rules of TS 13902, the sandwich panel application standard, to Nuhpanel products. The binding text is the standard itself.

Roof pitch

At least 7% where a single panel spans from ridge to valley, and at least 10% where two or more panels are used. On a roof with transverse joints, water stays longer on the lap line, so the pitch increases. Nuhpanel roof panels are produced in one piece up to 15.5 m, so most projects need no transverse joint at all.

Loads

Wind and snow loads are calculated to TS 498 for the region of the project. The panel section and the purlin spacing follow from that calculation; panel thickness alone does not give a load value. Distributed load and limit values by family are in the Load Tables section.

Colour and panel length

Dark panels absorb a larger share of solar radiation; the outer sheet warms and expands while the inner sheet does not expand as much, and the panel works. Panel lengths are therefore shorter in dark colours:

Panel	Light colour	Dark colour
PUR-PIR wall and cold room	12.00 m	6.00 m
PUR-PIR roof	13.60 m	10.00 m
Rock wool / glass wool wall	10.00 m	6.00 m
Rock wool / glass wool roof	12.00 m	9.00 m
EPS wall	12.00 m	6.00 m
EPS roof	13.60 m	10.00 m

The values are for 0.40/0.50 mm steel and 40 mm panel thickness. For other thicknesses and lengths, ask us.

Steel, coating and paint

Minimum steel thicknesses on a 40 mm panel: 0.50/0.50 mm for rock wool and glass wool, and 0.35/0.45 mm (inner/outer) for EPS, PUR and PIR. Galvanising is at least 100 g/m², and aluminium-zinc alloy at least 70 g/m². The outer face carries at least 5 microns of primer and 20 microns of paint, and the inner face at least 5 microns of primer.

The paint type follows the environment: polyester is not enough on the coast or in an industrial area. The detail is in the Metal, Coating and Colour section.

Fire

Products below class C-s3,d2 cannot be used. On roofs, panels that are not metal on both faces require a B_roof classification to TS EN 13501-5. The classes and their equivalents are in the Fire Classes section.

Unloading and Lifting

A panel is handled twice before it reaches its place: when it is loaded at the factory and when it is unloaded on site. Most damage happens in those two moments, not during installation.

Unloading from the vehicle

Packs are unloaded with a crane or a forklift with suitable attachments. For packs longer than 7 m, a four-fork attachment is used; two forks bend the pack in the middle.

Steel rope and chain are not used on a crane. Flat nylon, silk or hemp slings at least 20 cm wide are used. Timber blocks are placed above and below where the sling touches the panel; the block projects 3.5 cm beyond both sides of the pack. If the sling is too short the load bears on the edges, the lap profiles are crushed, and that panel no longer keeps water out.

Packs longer than 6 m are lifted with a purpose-made spreader; the spreader cannot be shorter than half the shortest panel. One pack is lifted at a time and packs are never dragged.

Lifting onto the roof

Packs are not piled at a single span on the roof and are not stacked; they are distributed over the purlins. A stacked pack is a point load the structure was not designed for.

Taking panels from the pack

Once the pack is opened, the top panel is not dragged off. Each panel is lifted individually and not rubbed against the one below; rubbing scratches the paint of the lower panel.

A panel is not held by its lap or by its facing. The facing separates from the core and the panel loses its composite action at that point. Lifting is done with vacuum equipment or with enough people.

Storage

Panels deteriorate while waiting on site, not during installation.

Under cover

Packs to be stored unopened are kept in a closed, dry place. The floor should fall slightly (2-3%) so that water vapour does not condense inside the pack.

In the open

Where outdoor storage cannot be avoided, packs are kept at least 20 cm above the ground and covered with a UV-resistant tarpaulin. The tarpaulin is laid so that it does not block airflow: vapour builds up under tightly wrapped plastic and the panel corrodes from the inside.

Packs are not left in the open for more than a week and their moisture is checked daily. Packs are not stacked on one another and nothing is placed on top of them.

Soil, lime, mortar, fertiliser, acid, salt and alkali all lead to corrosion; contact with them is prevented.

Protective film

The film on the steel is there for transport and installation scratches, not for the sun. In sunlight the film bonds to the paint and lifts it when removed.

The film is removed immediately after installation and no later than 15 days from the production date. An opened pack is repacked at the end of the working day.

Roof Panel Installation

The performance of a panel is set by the detail closed on site, not by the value measured in the laboratory.

Direction and sequence

The structure is checked, the prevailing wind direction is established on site, and installation starts from the opposite side. A lap does not stand against the wind.

Laps and transverse joints

Where a transverse joint is needed, an expansion plate is placed over two purlins and fixed. Silicone tape or double-sided tape is run over the lower panel, in front of the screw line and preferably in front of and behind it. The upper panel laps the lower one by at least 20 cm.

Fixing

Screws are applied through the rib with a saddle profile, not through the rib crown; the saddle carries an EPDM gasket, matches the rib dimension and is at least 2 mm aluminium. Screws are not hammered but tightened to a set torque: an undertightened gasket does not hold water and an overtightened one deforms the sheet. Correct fixing is reached when the EPDM washer is compressed by about a quarter of its thickness. The driver is run at 1500-1800 rpm.

The inner sheet of the panel meets the purlin flush. On rock wool panels, fixing is made with a metal connection plate; a fibrous core does not hold a screw on its own.

Roof screw length: insulation thickness + rib height + purlin thickness + 20 mm.

Thermal bridges and corrosion

A 2-10 mm self-adhesive foam is applied where the structure meets the panel and where the panel meets an accessory. Direct metal-to-metal contact is both a thermal bridge and the start of corrosion.

Sealant is run along the edges of accessories, across and along, 2 cm in from the edge.

Ridges and valleys

The lower ridge member is fixed to the purlins on both sides, the panels are screwed over it, and the gap at the ridge joint is filled with insulation. Before the upper ridge is placed, sealant or double-sided tape is applied 2 cm in from the ends.

Waterproofing is applied inside every valley. Concealed and central valleys also require insulation beneath the valley.

Weather and cutting

To reduce thermal stress, an air temperature of +10 °C or above is recommended on the day of installation. Panels are not installed in high wind or rain.

Where a panel has to be cut, an abrasive disc is not used. The sparks burn through the galvanising and the paint at individual points, and those points corrode within a few years. Cutting is done with an electric saw or a nibbler.

Panels from the same production batch are laid on the same elevation; there can be a shade difference between panels produced at different times.

Wall Panel Installation

The rules on walls follow the same logic as on roofs; the differences are below.

Starting out

The structure is checked and the prevailing wind direction established. At the plinth level, a drip profile matching the panel thickness is fixed horizontally to the structure: this is what stops water working inwards from the lowest level.

Whether the panel is laid horizontally or vertically, work starts from the side opposite the prevailing wind, according to the joint detail.

Fixing

On a concealed-fix panel the screw stays inside the interlock channel and the next panel covers it, so no panel is started before the previous one is locked. On an exposed-fix panel the screw stays outside with its gasket, and is not tightened far enough to crush that gasket.

For concealed-fix work, the screw length is: the panel thickness at the fixing point + the substructure thickness + 20 mm.

The inner sheet of the panel meets the column or rail flush, and the form of the outer sheet is not deformed.

Surfaces

Once the protective films are removed, the installed surfaces are confirmed to belong to the same elevation. All accessories in the project are applied at internal and external corners and around doors and windows.

Where cutting and welding are done on site, flying swarf is prevented; swarf on the steel becomes a focus of corrosion.

An air temperature of +10 °C or above is recommended on the day of installation.

Partition Walls and Cold Rooms

The rules for wall installation apply to partition walls. Cold rooms and cold stores add further requirements.

Sequence

Installation begins with the walls, then the ceiling, and the floor last.

Sealing

A 2 mm gap for sealant is left at the panel joints; the joint channels are sealed with butyl sealant. Silicone is used in the joint between two panels; on surfaces where food is stored, food-safe silicone is required.

The protective polyethylene film is removed once installation is complete.

Floors and thermal bridges

Where the floor is to be insulated, the cold room area is designed as a lowered slab so that the finished level matches the surrounding floor.

In rooms below −5 °C, a narrow strip of the inner steel sheet is removed near the floor: otherwise the sheet forms a continuous thermal bridge between the floor and the room.

In blast chilling and frozen storage rooms, the floor is ventilated from below or fitted with heating elements so that the ground does not freeze and cause structural damage.

Refrigeration and electrical runs passing through the ceiling and walls are insulated so that they do not conduct heat.

Commissioning

The room is cooled gradually, and a freezer room carries enough pressure relief valves. A sudden pressure difference buckles the panel faces.

Fasteners and Ancillary Materials

However good a panel is, it does not outlive the screw that holds it in place.

Choosing the screw

Fasteners must meet the mechanical properties of TS EN ISO 3506-1 and hold an ETA or UTO certificate. The number, type and length of screws are set by the project; the drilling capacity must suit the thickness of the substructure. On steel structures, self-drilling screws are used.

Each screw is used with a stainless washer with an EPDM gasket of at least 16 mm diameter.

Corrosion category

The screw material is selected according to the environment the building stands in (TS EN ISO 12944-2):

Environment	Example	Suitable screw
C1, very low	Indoor, dry	Galvanised carbon steel is sufficient
C2, low	Rural, very low salinity	Zinc plus organic coating, or stainless
C3, medium	Urban, industrial, 1000 m from the sea	Zinc plus organic coating, or stainless
C4, high	Coastal and industrial, 100-300 m from the sea	A4 (1.4404 / 316) and above
C5-I / C5-M	Severe industrial or marine	A5 (1.4529)

For stainless fixings, bimetal screws are used, with a stainless body and a carbon steel drilling tip: a stainless tip cannot drill the substructure.

A test report is valid only if it gives the tensile and shear capacity of the whole connection, not of the screw alone.

Tapes, sealants and foams

These are the materials that seal the ridge, the joints and the side laps of the panel. Sealant applied in the wrong place traps water inside the panel; sealant that is missing lets it in.

Maintenance and Repair

What extends the life of a panel is the annual inspection. The inspection is carried out by an authorised installer.

Once a year

Panel surfaces are washed with unpressurised water. Stains are removed with a water-based liquid dish detergent and a soft sponge, without pressure. No chemicals are used.
Accessories degraded by the weather are replaced.
Screws that have shifted, broken or worked loose are renewed.

Damage

Scratches on the surface are covered with a suitable touch-up paint.
A scratch that reaches the galvanised layer, or a panel crushed by external force, is not repaired but replaced: at that point there is no protective layer left and corrosion works its way from the inside.
Where water has entered, the insulation in that area is inspected and renewed.