Balconies are exposed to external weather conditions and moisture, which can affect joints, fixtures and surfaces over time. When sealing joints, bonding external fixtures or addressing waterproofing requirements on balcony floors, it is important to select products that are suitable for the intended application and conditions.
This DIY balcony guide is designed to help you understand common scenarios and identify appropriate Sika solutions for sealing, bonding and waterproofing tasks. Select one of the questions below to explore the relevant Sika product options for your specific application.
How to waterproof a balcony floor?
Sikalastic®-1K ES is a cementitious waterproofing and concrete protection mortar that waterproofs balcony floors before the application of tiles. It forms a seamless, flexible barrier that prevents water ingress while also protecting concrete surfaces.
Mix the product with a low speed (< 500 rpm) electrical mixer, ensuring that the mortar is homogenous and lump free.
If applying the mortar with a brush take care to evenly cover the entire surface. The maximum recommended layer thickness is 1 mm per layer. The application of a minimum of 2 or 3 coats is recommended (subsequent coats must be applied cross-wise and you must until the first coat is dry to apply the next coats).
If applying with a trowel the application must be done covering the whole surface of the substrate with uniform thickness. Press the trowel firmly against the surface. At least 2 coats must be applied with a final thickness of at least 3 mm. The maximum recommended thickness for each layer is 2 mm.
Refer to the Product Data Sheet for detailed application instructions.
Sikalastic®-6100 FX is a lightweight waterproofing mortar designed for waterproofing small external areas like balconies. It is crack-bridging, rapid curing and highly durable.
Sikalastic®-6100 FX can be applied by brush, trowel or sprayed with suitable equipment. Roller application is possible, but not recommended. You must dampen the substrate before applying the first coat to ensure adhesion. Apply the first layer to approximately 0.5 mm thickness. Allow at least 2 hours of curing before applying a second coat. Slightly dampen the first coat, removing any excess moisture, and apply the second coat perpendicular to the previous coat. The second layer should be approximately 1.5 mm thick to ensure a total membrane thickness of 2 mm.
Refer to the Product Data Sheet for detailed application instructions.
How to seal balcony floor joints?
Sikaflex®-415 Universal is a polyurethane sealant and adhesive designed for sealing floor and wall joints. It has good movement capability and good resistance to weathering.
Apply masking tape where neat or exact joint lines are required. Prime the surface as recommended in substrate preparation section of the Product Data Sheet. Open the seal on the top of the cartridge or open the end of the foil pack, fit the nozzle and cut it to the desired bead size. Insert the product into the application gun. Apply the sealant into the joint ensuring that it comes into full contact with the sides of the joint and avoiding any air entrapment. As soon as possible after application, tool the sealant firmly against the joint sides to ensure adequate adhesion and a smooth finish.
Refer to the Product Data Sheet for detailed application instructions.
Sikaflex® PRO-3 Purform® is a polyurethane joint sealant for interior and exterior floor joints. It has high movement capability, high resistance to weathering and good durability, making it perfect for sealing outdoor balcony floor joints.
Apply masking tape where neat or exact joint lines are required. Prime the surface as recommended in substrate preparation section of the Product Data Sheet. Cut the top of the foil before or after inserting into the sealant gun. Fit the nozzle onto the sealant gun and cut the nozzle to the required bead size. Extrude the product into the joint ensuring that it comes into full contact with the sides of the joint and avoiding any air entrapment. As soon as possible after application, tool the sealant firmly against the joint sides to ensure adequate adhesion and a smooth finish.
Refer to the Product Data Sheet for detailed application instructions.
How to bond objects outdoors?
Sikaflex®-11 FC Purform® is a multipurpose adhesive and joint sealant that provides strong, durable bonding for a wide range of outdoor materials including concrete, metal, wood and glass. It is ideal for balcony applications where a tough, weather-resistant bond is required.
After the necessary substrate preparation according to the Product Data Sheet, insert the cartridge or foil pack into a sealant gun. Apply the adhesive in triangular beads, strips or spots at intervals of a few centimetres each. Press the object firmly into place before skinning of the adhesive occurs.
Refer to the Product Data Sheet for detailed application instructions.
Sika® Stixall® is a hybrid adhesive and sealant that can bond virtually all materials to anything. It has excellent initial grab, is waterproof and weatherproof and can be applied to damp surfaces, making it perfect for fixing items on a balcony.
Cut the tip of the cartridge, fix the nozzle, cut it to the desired size and apply with a standard sealant gun. For lightweight items apply the adhesive to back of the item in one or two continuous beads and press it immediately into place. For bonding heavy items apply the adhesive all the way around the edge of the item 30-50 mm from the edge and cover the back with beads of adhesive at 300 mm intervals.
Refer to the Product Data Sheet for detailed application instructions.
Sika® Multi Stick is a high strength grab adhesive with incredible initial grab, high bonding strength and excellent adhesion to all substrates.
Cut the tip of the cartridge, fix the nozzle, cut it to the desired size and apply using a standard C4 sealant gun. For lightweight items apply the adhesive to back of the item in one or two continuous beads and press it immediately into place. For bonding heavy items apply the adhesive all the way around the edge of the item 30-50 mm from the edge and cover the back with beads of adhesive at 300 mm intervals.
Refer to the Product Data Sheet for detailed application instructions.
How to seal glass joints?
Sikaseal®-174 is a silicone sealant for window and door frames. It is flexible, has very good resistance to UV and weathering, and is non-sag helping to maintain a secure and watertight seal.
Apply masking tape where neat or exact joint lines are required. Prime the surface as recommended in substrate preparation section of the Product Data Sheet. Open the seal on the top of the cartridge, fit the nozzle and cut it to the desired size. Insert the product into the caulking gun. Apply the sealant into the joint ensuring that it comes into full contact with the sides of the joint and avoiding any air entrapment. As soon as possible after application, tool the sealant firmly against the joint sides to ensure adequate adhesion and a smooth finish.
Refer to the Product Data Sheet for detailed application instructions.
How to tile a balcony?
SikaCeram®-204 Medium White is a white tile adhesive suitable for fixing ceramic, earthenware and certain stone tiles on balconies. It provides strong adhesion, has no vertical slip and has extended open time.
Mix the product according to the instructions on the Product Data Sheet. Apply the adhesive using a notched trowel. Apply sufficient tile adhesive to the surface and to the back of the tiles, ensuring that enough adhesive has been applied to adequately wet the backs of the tiles. Press the tiles firmly into the adhesive to ensure full contact and a strong bond. Tiles must be fixed on freshly applied adhesive, if a film forms on the surface of the adhesive, it has been left for too long and you must remove it and apply a fresh layer to continue with proper tile application.
Refer to the Product Data Sheet for detailed application instructions.
SikaCeram®-204 Rapid is a fast-setting tile adhesive designed for projects where a faster setting time is needed. It allows tiles to be fixed quickly and securely, making it ideal for balcony projects that are exposed to changing weather conditions.
Mix the product according to the instructions on the Product Data Sheet. Apply the adhesive using a notched trowel. Apply sufficient tile adhesive to the surface and to the back of the tiles, ensuring that enough adhesive has been applied to adequately wet the backs of the tiles. Press the tiles firmly into the adhesive to ensure full contact and a strong bond. Remove excess adhesive from the tile face and from between tile joints before it dries. Tiles must be fixed on freshly applied adhesive, if a film forms on the surface of the adhesive, it has been left for too long and you must remove it and apply a fresh layer to continue with proper tile application.
Refer to the Product Data Sheet for detailed application instructions.
SikaCeram®-690 Elite is a high-performance wall and floor tile grout that delivers a smooth, durable finish. It is stain resistant and easy to clean, helping your balcony stay looking clean and fresh for longer.
Mix the product according to the instructions on the Product Data Sheet. Apply the grout using grout spreader, squeegee or grouting float/trowel. Completely fill and compact the joints uniformly. Using the same spreader/float remove excess grout from the tiles by moving the tool diagonally across the joints. When the grout is touch dry, in about 15-45 minutes, use a damp sponge to clean the tile surfaces. When the grout has set hard polish the tile surface by wiping with a clean, soft dry cloth.
Refer to the Product Data Sheet for detailed application instructions.
