Combo Roofing System

Foam Roofing

  • Polyurethane Foam is a Spray applied, rigid monolithic layer that has been in use as a roofing and insulation material for over 45 years.
  • It is fully bonded to roof slab and is impermeable to water.
  • It can be availed in different densities by adjusting the mix proportions, as per the specification and site requirement.
  • Foam roofing produces energy savings of 30% or greater when compared to the alternative roofing systems. The cost of the roof can be easily recovered in less than 5 years. simply through these energy savings alone!

The Combo Roofing System

Totally new approach towards waterproofing compared to the present systems, it’s a Hybrid System compiling of all the previous concepts.

  • Spray applied. quick-setting foam system comprising of 5 layers of protection from water leakage problems & providing Thermal Insulation.
  • This Monolithic system can carry loads of up to 2.5 tons per m2. A System that reduces the Relative Dead load of the Structure by 20 % & time consumption of work by 30%.
  • Consistent sustenance and life span of about 25 years.


Proposed Roofing System shall Includethe Following Specific Stages:

  • Roof slab shall be inspected by M/s Al Haiel to check the acceptance of the roof for application of the Combo roofing system.
  • Clean the roof using compressed air to make sure substrate is free of dust and debris.
  • Supply and spray apply foam insulation polyurethane at an average thickness 30 -40mm over the entire roof areas including the up stand to a height of max.200mm.
  • Supply and apply liquid waterproofing coating over the entire foam area and allow to dry for 48 hours.
  • The cured area is then subjected to water testing for next 24 hours.
  • Supply and lay protection layer over the entire roof area.
  • Supply and fix expansion joint filler boards in slope and panels.
  • Supply and lay protective screed in panels and cure as per standard procedure.
  • Supply and apply bonding agent to all corners and up stand side.
  • Supply and apply polysulphide sealant to all construction joints including backing rod.
  • All the horizontal corners at parapets, skirting and up stand are smoothened by making angle fillets of standard cement, sand mortar mixes.
  • Supply and brush apply cementatious weather coating over the entire roof area including up stands and allow drying 48 hours.
  • The Guarantee is issued after the final inspection from the Manufacturer’s side.

Method Of Application for Roof Waterproofing System

(Combo Roofing System)

The Combo Roofing system consists of multiple layers. Each layer has a distinguished purpose of its own and is thus mandatory for the 100% efficiency of the system. The following step – by – step segregated representation of the system with reference to the function of each layer.

Surface Preparation

The surface of strata to be waterproofed must be free from all kinds of oils &Chemicals. After making sure that the horizontal surfaces, edges& Corners are clean the skirting area is protected by using polythene sheet so as to keep it from being pitted by the jet of the sprayer.

Polyurethane Foam

The polyurethane foam is prepared by the mixing of polyol withisocyanate in the foam machine.This mixture is then sprayed onto the surface layer after layer until the desired thickness is obtained. A minimum setting period is maintained between the layers so as to get maximum bonding between them. It is very delicate process and requires skilledlabor.

Protection Layers

The insulating properties of the foam can be compromised by moisture vapor. The coating needs to be able to protect the foam from a build-up of this vapor, so that it won’t reach the dew point. Anothermajor hindrance to the PU Foam is the U.V Rays from the sunlight. In Order to outgrow from these problems the following protective coating are provided.

Rubberized Coating

The rubberized coating assists the foam at the time of expansion and contraction with respect to atmospheric temperature change and keeps it from damages due to elongation.

Separation layer

The separation layer acts as a semi barrier between the coating and screed, as direct contact to a rigid layer may reduce the elastomeric properties of the coating and lead to cracking.

Protection Screed

This is the rigid protective course that keeps the underlying layers from direct exposure to atmospheric & limatic factors and also from direct loads that may occur due to overlying structures or any kind of possible traffic. It also helps in attaining the right amount of slopping for the roof. The Joint between the compartments are packed using Back –Up Rods and the voids are sealed using joint sealants thoroughly as these joints are one of the major points of weakness in the protection layer.

Weather Coating

This is the final most layer applied to the system. It consists of liquid coating comprising of materials which safeguard the underlying layers from the harmful U.V Rays and heat Sun. This Layer is responsible for avoiding the cracking of the screed due to thermal expansions and contractions.

Finishing Works

Angle fillet

The corners created at the meeting point of the horizontal and vertical surfaces are always identified as weak –sports in water proofing. Water may seep downwards through these points. In order to avoid this weakness in the structure we make angle fillets. They also help in providing good runoff water flow on roofs. Apart from that it ensures that ne weak corners are formed during weather coating.

Joint Sealant And Spec Cord

The joints lefts unattended after the removal of the top edges of the filler board are alsoaccounted as weak sports. They allow water seep ages as well as affect the integrity of the surface and the slopping. These joints are packed with spec cords and then the remaining  space is sealed tight using joint sealants.it may done before or after the top coat as per the site specification.