External Walls Rainscreen cladding – Metal rail systems
 
To obtain the optimum performance of the system, the Slabs should be applied with the patterned side facing outwards. The resilient inner layer will accommodate surface irregularities.
 
Close butt the slabs at all vertical and horizontal joints. Stagger the horizontal joints of the insulation in accordance with good fixing practice.
 
Fix using a combination of metal and polypropylene fixings in accordance with the detail shown in Figure 1 inside the datasheet. Fixings should have a minimum head diameter of 70 mm.
 
Rainscreen Duo-slabs should be cut and tightly fitted around wall brackets where these occur. 

Rainscreen cladding – timber batten application  

The slabs should be tightly fitted between the timber battens prior to the installation of the external cladding boards and mechanically fixed.
 
Provision should be made for a ventilated air space behind the cladding boards. All horizontal joints should be closely butted to optimize the insulation performance. Once installed, due to their robust outer facing surface, the slabs can be left unprotected for an extended period of time prior to fixing the rainscreen cladding.

Standards and approvals

Rainscreen Duo-slab satisfies the requirements of BS EN 13162: 2001 ‘Thermal insulation products for building – Factory made mineral wool (MW) products - specification’.
 
CE Mark
 
Rated A1 when tested to EN 13501-1 classification using test data from reaction to fire test.
 
Wind resistance

Rainscreen Duo-slab fixed as indicated in the datasheet, (See Figure 1, Installing Rainscreen Duoslab) has successfully undergone wind resistance testing by the Building Research Establishment. Windloading fatigue tests were used to simulate the performance of the slabs when fully exposed and subjected to fluctuating wind loads during the construction stages of buildings. The tests simulated and exceeded the maximum UK basic wind speed of 56 m/s as defined by BS CP3: Chapter 5: Part 2: 1972.
 
Once installed, due to their robust outer facing surface, the slabs can be left unprotected for an extended period of time prior to fixing the rainscreen cladding.

Condensation control

Vapour resistivity=5.9 MNs/gm. The slabs, therefore reduce the risk of condensation, allowing natural drying out of the structure. See typical relative humidity / temperature graph inside the datasheet.