Concrete

Roofs --> New Construction --> Concrete

Concrete roofs worldwide provide the most stable roof construction for resistance to hurricanes and other severe weather conditions. Sealoflex® Systems, in combination with these substrates, further enhance the uplift resistance during severe weather events.

As a general rule, concrete roof surfaces should be sloped before waterproofing is applied. This can either be achieved by casting the structural slab with a slope of at least 1/4" per foot (2% slope) or casting a sloped layer on top of the structural slab. In certain areas, this is commonly done with Cellular Lightweight Concrete, which also serves as thermal insulation. This can also be achieved by simply using a dry pack sand-cement screed. In any event, whatever method is used, it is recommended that Sealoment™ Plus be applied as soon as the surface has become walkable. This will prevent water from entering the concrete during the curing period and increasing the moisture content of the substrate before the application of the relevant Sealoflex® System.

  • Cellular Light Weight Concrete
    <p>Cellular Lightweight Concrete is made of almost 100% Portland Cement. The result is that it contains very high quantities of lime (calcium hydroxide), which is a very strong alkali. For this reason, acrylic waterproofing systems may not be used. The rubber based Sealoflex® CT System is, however, ideal for waterproofing this type of substrate. It is highly recommended that as soon as the Cellular Lightweight Concrete has cured enough to be walkable, is should immediately be primed with Sealoment Plus™ which will prevent water from precipitation from entering the substrate.
  • Light Weight Concrete
    Light Weight concrete is generally produced using lightweight aggregates in place of the sand and stone aggregates used in standard concrete. Consequently, the percentage of Portland Cement in lightweight concrete is not as high as in Cellular Light Weight Concrete. Therefore, it is quite safe to use the Sealoflex® acrylic (water based) or the Sealoflex® CT (rubber based) System as the roofing membrane. It is highly recommended that as soon as the Lightweight Concrete has cured enough to be walkable, is should immediately be primed with Sealoment Plus™. which will prevent water from precipitation from entering the substrate during the curing period.
  • Structural Concrete
    If the structural concrete roof deck is the final surface to be waterproofed, it must have a slope of at least 1/4" per foot (2% slope). It is highly recommended that as soon as the Structural Concrete has cured enough to be walkable, is should immediately be primed with Sealoment Plus™ which will prevent water from precipitation from entering the substrate. Before application of the Sealoflex® System, the moisture content of the concrete should be checked. It should be below 8%. Further information regarding moisture content can be obtained here ADD DREADED WATER SANDWICH LINK.