Product
The range of Rocksilk Krimpact Flat
Roof Slabs are high strength, consistent density, rigid slabs
manufactured using the new Krimpact technology, specifically
designed for use in flat roofing. The tissue facing recommended for
this application controls the absorption of hot bitumen and
provides a good bond to resist the effects of wind suction.
Typical Construction
Rocksilk Krimpact Flat Roof Slab and Rocksilk Krimpact
Cut-To-Falls are suitable for use on all types of roof deck.
The insulation slabs are laid over and fully bonded to a vapour
control membrane which is bonded to the roof deck. The insulation
is overlaid with a waterproof membrane consisting of either a fully
bonded built-up bitumen roofing system, or mastic asphalt. When
used with mastic asphalt, the insulation is overlaid with 12mm
bitumen impregnated fibreboard and an isolating felt.
The slabs are not suitable for the direct application of torch-on
roofing felts.
Installation
The vapour control layer and the Rocksilk Krimpact Flat Roof
Slabs are both fully bonded in hot bitumen and then
waterproofed.
Built-up felt membranes
High performance bitumen membrane systems are fully bonded in hot
bitumen to the Rocksilk Krimpact Flat Roof Slabs using traditional
roll and pour methods. Rocksilk Krimpact Flat Roof Slabs are not
suitable for the direct application of torch-on roofing
felts.
Mastic asphalt surface
Rocksilk Krimpact Flat Roof Slabs provide a stable base for mastic
asphalt. The slabs should be overlaid with a 12mm layer of bitumen
impregnated fibreboard. A bitumen felt (low grade is satisfactory)
should be loose laid without bonding onto the fibreboard prior to
the application of two layers of mastic asphalt.
Performance
Standards
Rocksilk Krimpact Flat Roof Slab and Rocksilk Krimpact Flat Roof
Slab Extra have been tested to the UEAtc Technical Guidelines MOAT
No 50: 1992,
Thermal insulation systems intended for supporting waterproofing
membranes on flat and sloping roofs. Rocksilk Krimpact Flat Roof
Slab and Rocksilk Krimpact Flat Roof Slab Extra are classified B
for mechanical performance – Roof only accessible for purpose
of maintenance. May be used without any restrictions.
Thermal performance
The thermal conductivity of Rocksilk Krimpact Flat Roof Slab is
0.038 W/mK.
The thermal conductivity of Rocksilk Krimpact Flat Roof Slab Extra
is 0.039 W/mK.
The table below gives U-Values for typical constructions insulated
with Krimpact Flat Roof Slab products.
Typical U-values (W/m2K) of flat roofs insulated
with Rocksilk Krimpact Flat Roof Slab
| Product |
Minimum thickness (mm) |
U-values
(W/m2K) |
|
|
| |
|
19mm chipboard, timber joists,
12.5mm plasterboard |
Profiled metal deck |
150mm concrete, 40mm screed, 13mm
plaster |
| Rocksilk Krimpact Flat Roof Slab |
180 (100 + 80) |
0.18 |
0.19 |
0.19 |
| 160 (2 x 80) |
0.20 |
0.22 |
0.21 |
| 150 |
0.22 |
0.25 |
0.23 |
| 145 |
0.23 |
0.26 |
0.24 |
| Rocksilk Krimpact Flat Roof Slab
Extra |
180 (100+80) |
0.19 |
0.20 |
0.19 |
| |
160 (2 x 80) |
0.20 |
0.22 |
0.21 |
| |
150 (2x75) |
0.22 |
0.23 |
0.22 |
Note: The figures in this table assume a single ply
membrane. The U-values have been calculated to BS EN ISO 6946:1997.
For project specific calculations contact our Technical Advisory
Centre on 01744 76 66 66.
Fire performance
All Rocksilk Krimpact Flat Roof Slab products are classified as A1
to BS EN ISO 13501-1, the best fire performing insulation. The rock
mineral wool in Rocksilk products has an extremely high melting
point of over 1000°C. In the event of fire they will emit
negligible quantities of smoke and fumes. The heat emission from
the products is insignificant.
Advantages
- Significantly improves acoustic performance
- Non-combustible product with highest Euroclass A1 rating
- Robust, consistent density solution with consistent compressive
strength
- Can be laid either way up