Areas of Specialization

Combo Roof System

The life of the building could very much depend on the quality and integrity of the roof. The ability of a roof to perform effectively on a long term basis depends on the quality of material, design of the roofing system and quality of workmanship. The extreme heat in the Middle East demands excellent insulation to prevent energy wastage. The Henkel Roofing System does just that, with a saving of over %40 in energy. It also provides for a perfect waterproofing thus making it the ideal and cost effective system. Combo Roof is a comprehensive system comprising of waterproofing, thermal insulation and finishing for the roof. The system is also approved by various authorities like Dubai Municipality, Sharjah Municipality, Sharjah Water and Electricity authority and Trakhees: Combo Roof system is an assured solution for your roof.

Spray foam roofing starts out as two liquid components - Polyfoam / Polyol, known as the «A» component, and a resin (or MDI), the «B» component. When the liquids are mixed at a one-to-one ratio, a chemical reaction occus and the mixture expands 20 or 30 times forming a solid, monolithic (seamless), closed cell, fully-adhered roof system that provides excellent water-resistance and thermal insulating abilities. Polyurethane Foam mechanics can spray applies a tapered roof system with the foam which eliminates the need for colsly tapered insulation systems. The vertical wall terminations are also spray applied making them an integral part of the roof system and minimizing additional component costs. Polyurethane foam adheres to just about everything so it can be installed over concrete, wood, by all major property developers, consultants and contractors. This system provides a manufacturer>s Guarantee of 25 years against any leakage. The system meets all latest thermal insulation standards and regulations in UAE and is accepted.

Procedure and Scope of Work

Upon casting and complete curing of roof slab manufacture>s engineer shell visit the site to inspect the roof and accept the roof for waterproofing and heat insulation work. A preliminary site inspection shall be carried out and any further preparation work if required shall be brought to the attention of the main contractor. Prior to commencement of roof waterproofing works, main contractor shell make sure following conditions are met:

  • All joints existing between roof slab other than expansions joints provided shell be filled with mortar.
  • Rain water outlet shell be place at specified height as per slope.
  • Vertical parapet wall shell be plastered to required heightRoof door threshold shell be in place. 
  • AC or water pipe sleeves shell be place at minimum height of 400mm.
  • All other work shall be completed on roof prior to commencement of waterproofing works.
  • On acceptance of roof from the main contractor, application crew of the approved manufacturer shell visit the site to commence merchandized cleaning operation using compressed air to free the entire substrate from dust and any other loosely laying particles.
  • On completion of cleaning works, other preparatory works shell be under taken like covering of parapet wall and other utilities fixed on the roof to avoid risk of over spray.
  • Supply & spray apply of polyurethane over the entire roof area including the up stand to a height of max 200mm.
  • Supply & Apply of RBE coat over the entire foam area and allow to dry for minimum 25 hours.
  • Supply & Apply of GEOTEXTILE protection layer over the entire roof area.
  • Supply & lay protective screed in panels and cure as per standard procedures.
  • Supply & Apply POLYBOND SBR bonding agent to all corners and up stands.
  • Prepare angle fillet all around parapet skirting area (For foundation-angle fillet to be done only for direct slab foundation) and up stands using sand cement mortar.
  • Supply & Apply of POLYSEAL PSPG sealant to all construcion joints including backing rod.
  • Supply & Apply POLYFLEX - COMBO over the entire roof area including up stands and allow drying for 48 hours.
  • Final inspection shall carried out and THE MANUFACTURER SHALL ISSUE A LIFE TIME GUARANTEE OF 25 YEARS

Green Roof Waterproofing

Green Mat - Ideal for Green Roofs

Green Matt is 100% natural. Due to its feature of light weight Green Matt does cause harm or effect various building elements such as building roofs, pillars and building foundation comparatively speaking with other conventional planting methods on roofings that require large volumes of soil.

Environmental Benefits

  • Green Roofs reduce the Urban Heat Island (UHI) effect the overheating of urban and suburban areas compared to the surrounding country side, due to increased paved, built-over and hard surface areas.
  • Green Roofs can be considered beneficial for their storm water retention capability.
  • Green Roofs can also reduce polution by filtering out dust particulars and other pollutants as the air passes over the plants.
  • Building Benefits.
  • Green Roof protect buildings from extreme solar radiation, regulate the internal building temparature and decrease the energy required to cool the building.
  • Green roofs help protect roofing membrane from extreme temparature fluctuations and reduce the negative impact of ultraviolet radiation.
  • Green Roofs can be used as a sound barrier for the building.
  • Increased out door space or gathering area with fresh air.
  • Green Roofs increase the asesthetic value of the property.

Membrane Waterproofing

Bituminous products are perfect for the waterproofing of roofs on buildings as they move with the structure as they are not too rigid and do not absorb water. Waterproofing membranes systems are designed to protect both residential and commercial buildings through a mixed substance made up of organic liquids that are highly sticky and viscous and also can be used as a continuous waterproofing membrane for foundations, basements, tunnels, concrete etc. and it is applied by flame bonding. Bituminous membranes are made up of more than one product. Bitumen mixed with a filler (limestone or sand) component such as sand. Polymers are added to the bitumen such as APP (Atactic Polypropylene) a plastic additive that gives rigidity and tear resistance, or SBS (Styrene Butadiene Styrene) a rubber additive that gives more elastic benefits.

Base Products

Polyster, fiber glass, rang fiber (hessian) and paper. These products are bought in roll format and are pulled through the bitumen mixes on huge rollers. The base product becomes saturated in huge tanks by the tar like bitumen substance, creating rolls of waterproof material.

Advantages of this system

  • Uniform thickness 
  • Membrane can be polyester re-inforced ensuring dimensional stability 
  • Excellent stability at high & low temperatures applications & service 
  • Higher tear & impact resistance & excellent 
  • Available in plain or mineral finish for light foot traffic

Process Description Surface Preparation

  • Survace shall be clean, dry and free from loose particles 
  • Dust, loose materials and protrusions must be removed and cracks holes made good 
  • For better performance surface may be dempened but not wet, particularly in hot and dry weather


Prior to start the start of applying primer work the surface shall be inspected and approved by the concern QAQC Engineer.

Health & Safety

  • Protective clothing such as golves and goggles should be worn when handling the product. Treat any splashes to the skin or eyes with fresh water immediately. 
  • Ensure that the container is available for medical attendant to examine any relevant instructions and content details

Application Bituminous Primer

Apply by means of brush, roller into the entire coverage area of the substrate and allow drying. The drying time depends on the porosity of the substrate and the environmental conditions (approx. 1.0-3.0 hrs.)

Application Bituminous Membrane

Bituminous membrane shall be laid fully torched on blinding concrete with minimum of 100m end laps and 150mm side laps Waterproofing membrane installation shall be performed using cylinder fed propane gas torch, trowel to seal the seams of the membrane and kinfe for cutting. The membrane is then placed in the correct torching on position then re-rolled for about half of its length without changing its orientation.
The membrane is then un-rolled again and torched on pressing the melted area against the substrate Repeat till the entire length of the membrane is bonded firmly onto the surface then the second membrane is laid in the same way with an overlap of 150 mm at the end and 100 mm at the side.  An extra length of minimum 300 mm of the horizontal membrane shall be left to carry up the vertical surface to maintain continuity of the membrane and be protected as above

The membrane on the exposed external vertical surfaces shall be carried up to a minimum of 150 mm above the finished ground level (i.e. side walk, retaining wall, columns etc.) and tucked into a continuous groove provided for the same and secured firmly with approved sealant/mastic recommended by the manufaccturer of the membrane. Inspection would be submitted for approval of the Engineer and trucked into a continuous groove provided for the sae and secured firmly with approved sealant/mastic recommended by the manufacturer of the membrane. Inspection would be sumbitted for approval of the Engineer.