Applications

NEW FLAT ROOF – Thermal insulation above the reinforced concrete slab with DESMOFLEX PU system

Applications

NEW FLAT ROOF – Thermal insulation above the reinforced concrete slab with DESMOFLEX PU system

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Product Categories

Waterproofing Floors

What do we need?

Brush, roller, paintbrush, airless spray

STEP 1 Surface Cleaning: Cleaning the surface to remove oils, loose materials, dust, etc.

STEP 2 Epoxy Primer: We apply the two-component water-based epoxy primer DESMOFLEX EPOXY PRIMER using a roller, brush or paintbrush, after mixing the two components according to the manufacturer’s instructions. The product penetrates deeply and provides excellent adhesion to both absorbent and non-absorbent substrates. It can also be applied to damp concrete surfaces and is an ideal primer prior to the application of polyurethane waterproofing products. The next coat is applied after 6–12 hours, while the surface remains slightly tacky, to achieve optimum adhesion between the layers.

STEP 3 Waterproofing: We apply the two-component polyurethane-bitumen membrane D-FLEX® BITU for the waterproofing and protection of horizontal and vertical surfaces against moisture and water. The material is applied by roller, brush, notched trowel or mechanical spray in two successive coats, creating a continuous, elastic and seamless waterproofing membrane. It can be applied in high thicknesses and effectively bridges cracks. It is suitable for waterproofing roofs, as well as for application beneath thermal insulation boards or tiles. D-FLEX® BITU is characterized by fast curing, high elasticity, excellent mechanical strength and resistance to seawater and most chemicals, ensuring long-term and reliable waterproofing protection.

STEP 4 Installation of Thermal Insulation Boards: We install ULTRAPOR XPS 10 cm thermal insulation boards. The boards are installed as the thermal insulation layer of the system, providing high thermal protection. Thanks to their low thermal conductivity and extremely low water absorption, they ensure stable and long-term thermal performance.

STEP 5 Floor Screed: The NSD 600 cementitious floor screed is applied for floor covering, levelling and smoothing. The material can be applied mechanically using a continuous-mixing machine or manually. It is evenly spread at a thickness of 8 cm, creating a durable and stable surface with high mechanical strength and strong adhesion to concrete. It is suitable for preparing floors prior to the installation of tiles, marble, parquet and other final floor coverings. NSD 600 offers excellent workability, can be applied on sloped surfaces and provides high compressive and flexural strength, ensuring a stable and reliable substrate.

STEP 6 Embedding of Reinforcement Mesh: We install T131 structural reinforcement mesh, ensuring adequate overlap between the sheets and securing them with binding wire. The mesh is placed on suitable spacers so that it is positioned within the upper third of the screed thickness and is fully embedded and covered by the material.

STEP 7 Expansion and Contraction Joints: Joints are incorporated into the screed to control shrinkage and expansion and prevent cracking. Perimeter joints are formed around walls and vertical elements using expanded polystyrene, while internal contraction joints are created every 2.5–3 m or approximately every 10–15 m². The joints are formed during hardening or by cutting after the material has set and are subsequently sealed with polyethylene backer rod and ELASTO PU elastic polyurethane sealant. The expanded polystyrene remains in the perimeter joints and, where required, sealant is applied at the surface.

STEP 8 Surface Priming: We apply the two-component water-based epoxy primer DESMOFLEX EPOXY PRIMER using a roller, brush or paintbrush, after mixing the two components according to the manufacturer’s instructions. The product penetrates deeply and provides excellent adhesion to both absorbent and non-absorbent substrates. It can also be applied to damp concrete surfaces and is an ideal primer prior to the application of polyurethane waterproofing products. The next coat is applied after 6–12 hours, while the surface remains slightly tacky, to achieve optimum adhesion between the layers.

STEP 9 First Coat – DESMOFLEX POLYURETHANE: We apply the first coat of the ready-to-use solvent-based polyurethane waterproofing membrane DESMOFLEX POLYURETHANE using a roller, brush or suitable spray equipment, creating a uniform elastic waterproofing layer at a consumption of approximately 0.5–0.8 kg/m² per coat. The membrane provides excellent elasticity and cures through moisture from the air and substrate, creating a continuous, seamless and hydrophobic surface. It provides crack-bridging capability for cracks up to 2 mm. While DESMOFLEX POLYURETHANE is still wet, THRAKON waterproofing tape (KF 12/7 or F 12/7) is installed at corners, floor-to-wall junctions and connections with parapets, ensuring the bridging of critical points and the watertightness of the system.

STEP 10 Second Coat – Embedding of THRAKON FABRIC: While the first coat is still wet, THRAKON FABRIC polyester reinforcement fabric is embedded into the material, ensuring complete embedding without folds or air entrapment. A second coat of DESMOFLEX POLYURETHANE, undiluted and applied crosswise to the first coat, is then applied at a consumption of approximately 0.4–0.5 kg/m², ensuring complete coverage of the fabric and creating a continuous, elastic waterproofing membrane.

STEP 11 Final Protective Coating: We apply the final protective two-component polyurethane coating DESMOFLEX TOP COAT after completion of the DESMOFLEX POLYURETHANE waterproofing system, using a roller or suitable spray equipment (airless spray), in one or two coats at a consumption of approximately 120–250 g/m² per coat. The coating creates a smooth, glossy and durable high-whiteness finish, protecting the polyurethane membrane against ultraviolet radiation, natural chalking and deterioration. It provides excellent adhesion and high resistance to abrasion, weathering and standing water, ensuring long-term protection.

Products Used