MAPEI SYSTEMS AT WORK
In 2015, to mark the golden jubilee of the mosque, the government gave the go-ahead for a series of interventions that had become necessary over the years to repair and waterproof the roof of the religious complex.
The intervention included replacing and repositioning the mosaic tile covering for the cupolas and pyramids.
The Public Works Department commissioned with the task of choosing which products to use decided to present the tender specifications to several companies and to invite them to carry out a survey of the site.
Mapei recommended using PURTOP 1000 two-component, solvent-free pure polyurea membrane and KERAPOXY improved, slip resistant, reaction resin adhesive and the proposal received the approval of the client.
THE SOLUTIONS PROPOSED
The long rows of cupolas and pyramids on the roof of the religious complex had been covered with two layers of ceramic tiles as a result of the work carried out previously. To carry out the waterproofing work, Mapei Technical Services recommended removing the top layer of tiles by hydro-blasting. Once the substrate had been prepared, it was treated with a coat of PRIMER SN two-component, fillerized epoxy primer mixed with ADDITIX PE, a powder used to increase the viscosity and thixotropy of epoxy-based and polyurethane-based resin products.
Then, while the primer was still wet, the surface was broadcast with QUARTZ 30/60, which is distributed in Malaysia by Mapei Malaysia Sdn Bhd.
After removing all the dust from the surface, a 2 mm thick layer of PURTOP 1000 two-component, solvent-free pure polyurea membrane was applied by spray with a high-pressure, bi-mixer type pump. PURTOP 1000 membranes are characterised by their high chemical resistance to alkalis and diluted acids, exceptional flexibility and tear strength, and make the surfaces immediately waterproof after application.
KERAPOXY improved, slip resistant, reaction resin adhesive was chosen to install the mosaic tiles (blue tiles for the cupolas and grey tiles for the pyramids which, from above, form a coloured chess-board effect), while for the joints the preference was for KERACOLOR FF polymer-modified, water-repellent, cement-based grout mixed with FUGOLASTIC polymer admixture to improve its resistance to abrasion and reduce its porosity and water absorption rate.
On the roof there are also frames embedded between the pyramids and cupolas that needed to be waterproofed because they were causing damp on the ceiling below. In this case, too, work commenced by using hydro-blasting equipment to remove the old waterproofing treatment and any deteriorated areas of the roof. The deteriorated areas were then reintegrated with PLANITOP G40 SP polymer-modified mortar (which is distributed in Malaysia by Mapei Malaysia Sdn Bhd). The next step was to apply a coat of PRIMER SN with a roller and to broadcast the surface of the primer while still wet with QUARTZ 30/60 (distributed in Malaysia by Mapei Malaysia Sdn Bhd), followed by the application of a 2 mm thick coat of PURTOP 1000 by spray.
Work was completed by applying a coat of MAPECOAT PU 15 two-component, aliphatic, solvent-based polyurethane finish, which resistant to wear and ultra-violet rays.