U-values
| R1-4r |
 |
PVC membrane
Construction plywood 15 mm
LPT-C purlins + mineral wool (200 - 400 mm), 0,034 W/mK
Vapour control layer
Plywood or profiled sheet
Standard coating/colour for sheet is PE/RR20 in all designs |
| Roof structure R1 |
Lower surface |
Perforation |
U-value (W/m2K) |
| LPT-C20015 |
Profile |
8-rows |
0.23 |
| LPT-C20020 |
Profile |
8-rows |
0.24 |
| LPT-C22515 |
Profile |
8-rows |
0.21 |
| LPT-C22520 |
Profile |
8-rows |
0.22 |
| LPT-C25015 |
Profile |
8-rows |
0.20 |
| LPT-C25020 |
Profile |
8-rows |
0.21 |
| LPT-C27515 |
Profile |
8-rows |
0.19 |
| LPT-C27520 |
Profile |
8-rows |
0.20 |
| LPT-C30015 |
Profile |
8-rows |
0.18 |
| LPT-C30020 |
Profile |
8-rows |
0.19 |
| LPT-C35015 |
Profile |
8-rows |
0.17 |
| LPT-C40015 |
Profile |
8-rows |
0.16 |
| LPT-C40020 |
Profile |
8-rows |
0.17 |
U-values by standard ISO EN 6946:2007 and EN 10211:2007. U-values need to be checked for each project according to project specification and chosen structural system, such as purlin specified in element.
Sound insulation
Rw values are theoretical values
| R1b |
 |
Single-ply PVC membrance
Construction plywood 15 mm
LTP purlins 200 - 400 mm (k600) + thermal insulation
Plastic VCL
Sheet 0.5 mm T20-72-1090 |
| Purlin |
Rw values |
| LPT-C200 |
48 dB |
| LPT-C225 |
48 dB |
| LPT-C250 |
49 dB |
| LPT-C275 |
50 dB |
| LPT-C300 |
50 dB |
| LPT-C350 |
51 dB |
| LPT-C400 |
52 dB |
| R2 |
 |
Single-ply PVC membrance
Construction plywood 15 mm
LTP purlins 200 - 400 mm (k600) + thermal insulation
Plastic VCL
Plywood 9 mm
Thermal insulation 50 mm
Perforated sheet 0.5 mm: T20-30W-1090 3 mm 15% |
| Purlin |
Rw values |
| LPT-C200 |
47 dB |
| LPT-C225 |
47 dB |
| LPT-C250 |
47 dB |
| LPT-C275 |
47 dB |
| LPT-C300 |
47 dB |
| LPT-C350 |
47 dB |
| LPT-C400 |
48 dB |
Sound absorption coefficients for the lower surface
Example of structure type R2
| Single-ply PVC membrance Construction plywood 15 mm LTP purlins 200 - 400 mm (k600) + thermal insulation Plastic VCL Plywood 9 mm Thermal insulation 50...100 mm Dust cover Perforated sheet 0.5 mm: T20-30W-1090 3 mm 15% |
|
This structure meets the requirements of absorption class B or A (EN ISO 11654) depending on the thickness and quality of the bottom insulation.
Fire resistance
Ruukki's prefabricated roof elements do not incorporate combustible materials, with the exception of the moisture barrier and any plywood layers.
The fire class of the PVC membrane is BROOF (t2). When using the PVC membrane on plywood, the roof must be divided into sections, each 2400 m2 in size (E1; 8.4.3).
The lower surface's fire class requirements are checked according to the building's fire class and the purpose of use of each respective space. For example, in a P2 class building, the surface fire class must in most cases be B-s1, d0, which effectively means that there must be a gypsum board or steel sheet installed on the lower surface. Where a perforated steel sheet is used for the lower surface and combustible sound absorption material in to be used, the appropriateness of the structure must be ensured on a case-by-case basis.
When fire class requirements are set for the elements' fire resistance, the load-bearing ability during a fire must be checked when dimensioning the purlins.
The requirement for the R15 class can usually be met with a basic structure featuring a steel sheet or plywood on the lower surface, provided that this is otherwise appropriate for the building. The R30 class requirements can be met with a structure which has a gypsum board (GN13) on the lower surface between the steel sheet covering and the purlins. For the R60 class, two fire-resistant gypsum boards (GF15) are required on the lower surface.
REI15 structure
|
PVC membrane
Construction plywood 15 mm
LPT-C purlins (200...400) k 600
- Rockwool UNS35 or A-Batts
Vapour control layer
Profiled sheet T15-115-1134 t=0.5 |
REI60 structure
|
PVC membrane
Construction plywood 15 mm
LPT-C purlins (200...400) k 600
- Rockwool UNS35 or A-Batts
Vapour control layer
Gypsum board GN13
Rockwool 50 mm
- UNS35 or A-Batts
Profiled sheet, perforated if necessary, T15-115-1134 t=0.5 |
Order & delivery
Market area: Finland, Sweden, Estonia and the United Kingdom.
Ruukki designs and delivers prefabricated roof elements based on customer's specifications for the project.