Waterproofing of terraces with 2-component, elastic, brushable, cement-based sealing slurry
AQUAMAT-ELASTIC Two-component, elastic waterproofing slurry
DUROCRET Polymer-modified cement mortar
RAPICRET Fast-setting patching mortar
ADIPLAST Polymer latex for multiple improvements of mortars
POLYESTER CLOTH FOR WATERPROOFING LAYERS Polyester cloth for reinforcing waterproofing layers
FIBERGLASS MESH Fiberglass mesh for reinforcing waterproofing layers
I. NATURE OF THE PROBLEM – REQUIREMENTS
Waterproofing of terraces, whether carried out during construction of the building or later on, must be absolutely watertight, reliable resistant to adverse weather conditions and long-lasting. Also, it must display elasticity and efficient bonding to the substrate.
The application of AQUAMAT-ELASTIC, elastic cement-based brushable sealing slurry, reinforced overall with sheets of fibreglass mesh or polyester cloth, 100 cm wide, covers all the above requirements. Its application on terraces creates a strong and continuous elastic waterproof coating, with excellent bonding and durability, able to follow expansion and contraction of the terrace, successfully.
It is an ideal solution whenever waterproofing is combined with the fixing of ceramic tiles, as a final coat.
Surfaces should be thoroughly cleaned from any loose particles, grease, dust etc.
Any necessary repairs or alterations to the gradient are carried out using a strong cement mortar (cement:sand = 1:2 to 1:3), reinforced by the addition of ADIPLAST polymer latex.
It is recommended that bonding of the cement mortar to the substrate is reinforced by applying a bonding layer to which ADIPLAST is also added (cement : sand : ADIPLAST : water = 1 : 1 : 0,5 : 0,5 by volume).
The intersection of the terrace with the vertical structures (parapet, stairwell termination), should be dampened and sealed along their length using DUROCRET polymer modified cement mortar, or a cement mortar reinforced with ADIPLAST polymer latex (formation of a 5-6cm triangular sided groove). Where fast work is necessary, RAPICRET, fast-setting patching mortar may be used instead.
DUROCRET consumption: 1,9-2,7 kg/m length of goove.
The substrate is thoroughly dampened, without leaving any water puddles.
Application of waterproofing
The content of the 25 kg bag (component A) of AQUAMAT-ELASTIC is added into the 10 kg of liquid (component B) under continuous stirring, until a uniform viscous mixture is formed, suitable for brush application. A low-revolution (300 rpm) mixer may be used for mixing.
A layer of AQUAMAT-ELASTIC is applied, as wide as the reinforcement (fibreglass mesh or polyester cloth) and while this is still fresh, the reinforcing material is positioned. The procedure is repeated over the remaining surface. The sheets of reinforcement should be positioned in sequence so that they overlap each other by 5-10 cm.
After drying of this layer, 2 more layers of AQUAMAT-ELASTIC are applied over the entire roof surface, letting the first layer dry before applying the second. The thickness of each layer should not exceed 1 mm, in order to avoid any cracking. The waterproofing should be extended at least 15-20 cm up to any vertical surfaces (parapet, stairwell termination etc), in order to form a watertight basin.
AQUAMAT-ELASTIC consumption: 3,5 kg/m2.
Covering of the waterproofing
The final surface can be covered ceramic tiles, paving slabs or terrazzo, or with a 6-8cm thick layer of gravel. In the latter case, it is recommended that a geotextile is placed between the waterproofing and the gravel layer, in order to protect the waterproofing layer from “injuring”.
Temperature during application should be at least +5oC.
The freshly rendered surface must be protected from high temperatures, rain and frost.
Where the waterproofing is intended to be the final coating of the surface, it is recommended that white AQUAMAT-ELASTIC is used, at least for the last layer, in order to reduce the absorption of heat from the sun’s rays and extend the life of the waterproofing.
Consult the instructions for safe use and precautions written on the packaging.