Warm flat roof - Cut to falls
 
DuoRock Cut to Falls is engineered to meet the demand for tapered solutions for existing and new roof constructions at an economical cost. The system provides a choice of design features and benefits to suit most applications. Available in DuoRock Tissue Faced and Single Ply Adhered versions, the system is backed by a complete ‘drawing board to site’ service.

The Cut to Falls Service
. site surveys
. preparation of bespoke and considered design solutions,  to any fall
. quotations for the supply of insulation systems
. precision manufacture and supply to order
. site advisory service prior to and during installation
 
The DuoRock Cut to Falls boards are delivered to site individually marked with a positional code corresponding to the detailed layout drawing provided. The board layout should strictly follow that shown on the drawing and to avoid error it is advisable to place each board in position temporarily, prior to attachment.

Boards should be laid with staggered joins where possible and tightly butted to avoid gaps.
 
When using DuoRock ensure that the dense layer is used on the upper side towards the membrane. This is clearly marked on the boards as ‘This side up’.
 
The use of small pieces of insulation board should be avoided.

Care should be taken to clean off all surfaces prior to the laying of insulation boards and membrane.
Appropriate stop battens should be installed to protect open edges of boards.

Day joints must be formed at the conclusion of each section of work to seal exposed edges of insulation boards and prevent damage.
 
Membrane installation
The membrane should be installed strictly in accordance with the manufacturer’s specification and fastening requirements for wind uplift

Mechanical fastener type
For the mechanical fastening of DuoRock Cut to Falls Boards to metal, concrete or timber decks, Rockwool Limited recommends the use of fasteners incorporating either a plastic tube washer or alternatively a stress plate support thread.

Pre-cut mitres
The use of factory made pre-cut mitres reduces site cutting requirements and ensures accurate installation.
 
Deflector overlay boards Deflector overlay boards reduce the risk of water ponding behind roof lights, plant rooms and other roofline obstructions. They are supplied in two sizes and can be
trimmed on site where necessary.

Drainer boards
Drainer boards have been developed to assist drainage at the roof verge, or into drainage outlets, where water may be held back as a result of the additional thickness of membranes around these points.
 
Drainer boards are supplied in the size 1200 x 333 mm and incorporate a typical fall of 1:20.
 
Consideration of the overall thermal performance of the roof may be required, depending on the use and location of Drainer boards.