The Combo Roof System is a comprehensive system that includes waterproofing, thermal insulation and roof finishing. This unique system is a technically advanced, fast curing system. Certified by the Dubai Central Laboratory (DCL), the polyurethane foam system forms a seamless waterproofing and thermal insulation system that is fully bonded to the roof slab. The uniqueness of this system is that it is a cast-in-place product whose performance depends on proper craftsmanship. The system meets all current thermal insulation standards and regulations in the UAE and is accepted by all major developers, consultants and contractors. The system was introduced by Roof Care in 2002 and is now a well-known system in the GCC construction industry.
COMBO ROOF APPLICATION PROCEDURE
SITE PREPARATION
Upon casting and complete curing of roof slab, Roof Plus’ engineer shall visit the site to inspect the roof and accept the roof for waterproofing and heat insulation works. 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.
PU APPLICATION
Upon completion of cleaning, spray application of the 1st layer shall commence where a combination of Polyol & MDI is sprayed onto the roof slab including up stands using spray combination equipment. The spray applied foam in liquid state hits the slab at a high pressure and penetrates into every crack and pin holes that exist on the slab. In minute it expands 30 times its volume and solidifies thereby sealing the entire substrate. The foam creates an impermeable waterproofing cum insulation layer with high thermal resistance, closing all pores and cracks that exists in the roof slab.
UV PROTECTION COATING
On completion of polyurethane foam application, an acrylic liquid UV protection coating shall be applied over entire foam to protect it from UV rays till the water permeability test procedure is completed.
FLOOD TESTING THE ROOF
Once acrylic UV coating is completely dried (minimum 24 hours), Our Engineer will visit the site to inspect the works completed and give clearance for flood test (minimum 24 hours), On successful completion of flood test a test report shall be prepared and maintained for records.
PANELLING AND SCREED LAYING
Upon successful completion of flood test, water shall be removed and geo-textile (120gsm) membrane shall be laid as a protection layer over the entire roof area and our crew will do the panelling work using expansion joint filler board and pre-mixed cementitious adhesive mortar to attain the desired slope levels prior to commencement of screeding works.
Protective screed of 300 OPC 10 mm aggregate, 25 N/mm2 strength screed will be laid in panels. Minimum thickness of the screed will be 40 mm and average thickness will be 80 mm. The screed will be finished either manually or by power float by our trained masons and cured as per standard procedures. The screed is added with plasticizers and micro fibres to avoid plastic cracks.
ANGLE FILLETS AND JOINT TREATMENTS
Angle fillets are done after application of PVA bonding agent to the corners of size 100×100 mm. Once screed is completely cured, all construction joints shall be opened and treated using heavy duty Polyurethane sealant and backing rod for accommodating movement of the concrete during expansion and contraction.
FINISHING
Once sealant applied is completely cured, solar reflective acrylic coating shall be applied over entire screed including upstands to form a uniform coating of maximum thickness 800 microns. This coating provide aesthetic look to the roof.
TIME EFFICENCY
Combo roof is the fastest way to insulate and waterproof your entire roof. Highly efficient spray technologies, specially designed detailing and perfectly matching system components combined with the employment of modern application technologies enables the Combo Roof system to save up to 40% time compared with a standard conventional roofing system. Furthermore, the use of standardized systems and optimized application techniques reduces the risk of application errors and leads as such to the most secure roofing installation. With all this measure, Combo Roof is designed with multiple effectively fully bonded waterproofing layers which make any water leakage more or less impossible. Combo roof is fast and reliable roofing.
Liquid System
Liquid systems are best suited for waterproofing bathrooms, kitchens and balconies where insulation is not normally required and tiles serve as a finish. All reputable manufacturers offer excellent cement, acrylic and urethane based liquid coating products. At Roof Plus, we usually recommend the product after thoroughly investigating the condition of the substrate and the client's requirements. All types of liquid coatings are applied by brush by trained technicians. Once the prescribed coats have been applied and dried, a 48-hour flood test is carried out to ensure that the surface is fully intact and waterproof before the floor tiles are applied.
We do apply,
Cementitious Coatings
Acrylic Coatings
Urethane Coatings
Conventional System
If we consider a conventional membrane system for the roof, which includes waterproofing, insulation, protection and finishing, we believe that the following combination will work for 10 years without failure.
Here's what the system looks like,
Foamed concrete on the slope 1:100
Primer
4mm APP modified membrane
Cured XPS insulation boards to meet the required U-value.
100GSM Geotextile membrane
50mm uniform thickness Structural screed concrete
Solar reflective acrylic coating as top layer
As the performance of the system usually depends mainly on the craftsmanship of the installer and not on the manufacturers of the individual layers in the above system design, the customer has the option to choose the brands for the membranes and the other layers specified, and we at Roof Plus will ensure delivery and correct application in accordance with standard guidelines for the protection of buildings against moisture penetration.
