Roof Gardens: Sika-Trocal roof  waterproofing membrane Type SGmA can be used in both extensive and intensive designs.    

Trocal Metal:
Trocal laminated metal is required at all perimeters and changes of direction or plane.  It is also required at all penetrations unless these are detailed with rigid PVC.

Trocal Metal is supplied as flat sheet to be cut and bent to form the profiles and sections as required.

All Trocal Metal flashing’s are secured with mechanical fasteners to the structure.

Please go to our AutoCAD section for a selection of the most common flashing details.    

Membrane Jointing
Creating a Welded Joint - General:
The seam overlap to be welded must be at least 50mm wide and both surfaces must be dry and free from dust or dirt.  Dirt or contamination must be removed, usually with water and a cloth.  The addition of a little washing up liquid can often assist in the cleaning process.  If stubborn, then Trocal L100 Cleaner (ethylacetate) may be sparingly used.  The minimum width of the welded area of the overlap must be 30mm.

A mini-jet brush head or a welding brush charged with THF is introduced between the two surfaces of the overlap and drawn along the seam for about 400mm, being followed by light pressure from the operative’s other hand.  The objective is to wet both surfaces simultaneously.  
  

Sealing the Joint:
The edge of the joint must be sealed.  Ensure that the edge of the joint is clean and dry.

Draw the clipped nozzle of the polyethylene bottle along the edge of the joint, depositing an even bead of Sika-Trocal liquid PVC.  This will obscure the edge of the top sheet while lapping onto the bottom sheet.   
   

Sika-Trocal Metal Discs
Application:
The discs are positioned at the required centres over the top surface of the roof substrate.  The fastener is then driven through the disc and insulation (if present) until it is secured into the substrate.  The discs should be so secured by the fastener that by just biting into the top surface of the insulation board without distortion they are unable to be rotated by finger pressure.

The Sika-Trocal roof membranes are then laid onto the roof in the desired position.  During the rolling out operation, the THF welding agent will be applied, so as to simultaneously wet the underside of the sheet and the topside of the disc. The two surfaces are then brought together under light pressure so that they are permanently fused.