Roof Waterproofing

There are millions of properties in this country and millions of roofs on top of these, they come in all shapes and sizes in a variety of materials including, asphalt, slates, tiles, green, corrugated and many many more.

Once a problem occurs to the roof and it starts to deteriorate or even leak, it can be a costly exercise to repair in patches or even replace the roof. With Polyprufe, the existing roof covering can be retained and a seamless roof waterproofing, spray applied coat can be used over the top of the roof covering to keep it watertight.

Once this has been completed by our specialist operatives a 10 -20 year guarantee can be issued (depending on specification and coverings )

Our spay applied system can also be used over asbestos to encapsulate and prevent the need for removal. The spray coating acts as a 'rubber roof membrane' giving long-lasting and flexible waterproofing.

The key to flat roofing and roof waterproofing is that the system is seamless, fully bonded and impact and abrasion resistant. Polyprufe coatings combine extreme application properties such as rapid cure (even at temperatures well below 0°C) and insensitivity to humidity, They have exceptional physical properties such as impact resistance, flexibility, tear strength, tensile strength, chemical and water resistance. The result is excellent long term weathering and abrasion resistance. The roof waterproofing system uses 100 percent-solids, so no solvents, no emissions and no VOC. Due to its exceptional properties, the Polyurea spray coatings are used extensively internationally for waterproofing, corrosion protection, containment, membranes, linings to tanks and structures, protection of concrete joins and structures.

Roof Waterproofing Application And Preparation:

Polyprufe is the most durable roof finish available on the market. The correct application is however of the utmost importance. Maclennan-LSE staff will inspect the roof / deck to be sprayed and advise on the correct preparation. The spraying teams will carry out any final preparation. The Maclennan-LSE teams are fully trained and experienced with all of the different substrates they are called upon to prepare and spray. Preparation is job site specific and each site presents its own challenges. Polyprufe Coatings has a strong working relationship with the manufacturer who review project and specification to insure the correct primer is used.

1) Preparation – The roof surface to waterproof must be sound, free of oil, grease and contaminants, but also dry. If the surface is not dry, we would use a damp tolerant primer, and a pull off test to check adhesion would be performed. We would ideally look for 0.75 N/mm pull off as a minimum. Preparing to BS standard 8204 (as per synthetic resin floors) is not a bad place to start.

2) Substrate – It is essential that the substrate is strong enough to take the roof coating. If in doubt, again a pull off test is the best indication, and any sub-standard roof surface can be blasted to remove any surface laitance in order to take you back to a sound, strong surface.

3) Other coatings or contaminants - If the surface is already coated, it is essential to make sure that it is strong enough to receive a very strong roof waterproofing system like the Polyurea, and that the two materials are chemically compatible. Often cross linking polymer based materials are used because of their ability to withstand chemical attack. Once these resins have cured chemically, they are very hard to bond to without the correct preparation, because they will have "closed out" Polyprufe surveyors are fully trained experts on roof waterproofing and have 20 years experience in waterproofing and roof coatings.

4) Colours: Polyurea is an aromatic. Therefore, as with all aromatics, over a period of time colour change as well as superficial oxidation will occur. The minimal oxidation, however, will not affect performance. The manufacturer can supply Aliphatic urethane and other suitable topcoats which Polyprufe can be apply where long-term aesthetics are important.