weberfloor 4686N Marine Extra Light (EN)

weberfloor 4686N Marine Extra Light is a lightweight, polymer modified cement-based levelling and fine smoothing compound for steel-, galvanized steel- and aluminum decks in layer thicknesses from 0 to 30 mm. The material is supplied as pre-mixed dry powder, water is added on site of construction. The screed can be hand-applied or pumped in towards place of application using a Weber mixer pump, and requires only light mechanical handling with a trowel, spatula or spiked roller to achieve an adequate surface evenness for a floor covering. The material quickly attains a high surface strength and is walkable after 3-5 hours. Final covering can be laid after 1-3 days. Note that the curing time depends on the substrate temperature and the ambient air temperature of the work area as well as the relative humidity. weberfloor 4686N Marine Extra Light meets all fire technical requirements as an underlayment for floor coverings onboard passenger/merchant vessels and offshore installations according to IMO Res. A.687 (16). For special applications not covered in this product datasheet, please contact Weber for further advice and guidance. Also refer to current national regulations.

Steel, galvanised steel, aluminium, concrete/cement-based, stone and ceramics and plywood boards. The substrate must be clean and free from dust, cement rich skin and laitance, grease and oil residues, weak surface layers and other impurities that might prevent adhesion. Laitance of old coatings and contaminants should be removed mechanically, e.g. by shot blasting or flame cleaning. The surface tensile strength of the substrate should be above 1.0 N/mm² (MPa). For layer thicknesses below 10 mm, the surface strength should be above 0,5 MPa. The substrate temperature should be above +10°C.

Declaration of Performance
DoP-SE-0297

PR-no.: 608140

NB:  All figures are based on hand application. For machine application other figures are valid. Contact Weber for more information.

PACKAGING
9 kg bags on plastic wrapped pallets (48 bags per pallet)

weberfloor 4686N Marine Extra Light is designed for use in marine and offshore installations inside in light traffic areas, mainly foot traffic, as an underlayment for floor coverings such as PVC, vinyl, linoleum, stone and ceramics, carpets etc. wweberfloor 4686N Marine Extra Light satisfies the requirements of the authorities and classification bodies for primary deck coverings. weberfloor 4685N Marine Ultra Light can be used as a bonded screed and as an underlayment screed for use on steel-, galvanized steel- or aluminum decks. weberfloor 4686N Marine Extra Light is designed for application at thicknesses between 0 and 30 mm. 

weberfloor 4686N Marine Extra Light is designed for use as an underlayment for most types of floor coverings and should not be used without a final floor finish. The floor covering should be applied as soon as the conditions apply. The product should not be used in a humid environment over 95% RH. Any special requirements for the floor covering concerned should be observed, comply with the requirements from the floor covering manufacturer. When the smoothed floor has hardened, and been rubbed down where necessary, it will provide a finished subfloor for most floor coverings. If weberfloor 4686N Marine Extra Light is not covered within the stipulated drying time, or used as a working platform or transport area during the building process, sufficient cleaning is important to achieve a suitable substrate for the floor covering.

When stored in unopened and intact packaging, under dry conditions, shelf-life is min. 12 months from date of manufacture. Incorrect storage could have an adverse impact on the product properties. Older material should be tested, using the stipulated amount of added water to the mix, to ensure that the product properties are intact and the material cures within 1-2 hours after application. Longer setting times indicate that the product properties have been disrupted and the material should not be used. Avoid adding more water than recommended.

The substrate should be mechanically prepared to remove impurities that might prevent adhesion and then vacuum cleaned. The substrate should be primed properly. Floor drains etc. should be protected with lids and separated with stop ends. Steel decks must be primed with weberfloor 4716 Primer diluted 5:1 with 5 parts of primer and 1 part of clean water, applied to the substrate using rubber squeegee, roller, brush or primer pump. Galvanised steel- and aluminium decks must be primed with weberfloor 710 epoxy Primer, applied to the substrate using a rubber squeegee and roller. After application and whilst the primer is still fresh, it must be sand-scattered completely with fire-dried quartz sand with grain size 1-2 mm. After the primer has cured all residual sand should be vacuum cleaned and the sanded surface should be primed with weberfloor 4716 diluted 1:3 with 1 part of primer and 3 parts of clean water.
If another epoxy primer is being used, check for compatibility with weberfloor 4686N Marine Extra Light. For details on the primers see separate product datasheets for weberfloor 4716 and weberfloor 710. The function of the primers is to improve adhesion to the substrate, to prevent air bubbles and de-watering of the screed before hardening.

The temperature in the substrate should be above +10°C for the primer to create a film. For ideal working conditions the ambient air temperature of the work area should be 10-25°C. Light ventilation in the work area is necessary, but windows and openings should be closed sufficiently to avoid draughts during and after application. The dry-mix material should be kept in a heated area before use. Strongly cooled material conveys a risk that certain additives will not be able to dissolve during mixture.

The material can be used in higher ambient air temperatures in the work area up to approx. +40°C. In such conditions the workability of the compound and the flow properties should be observed as high ambient temperature strongly affects the pot life (open time) of the product, e.g. lead to flow properties changing and premature setting and hardening of the compound. To compensate for too high temperature of the work area and in the substrate it is recommended to cool down the added water with ice and also to restrain from using the material in direct exposure to sunlight. Keep the dry-mix material stored in a ventilated area not exposed for direct sunlight.

Slow drying out due to low temperature and/or poor film formation due to high humidity should be observed as that may result in pinholes in the leveling layer.

weberfloor 4686N Marine Extra Light should be mixed by adding 4,5 liters of clean water per 10 kg bag (45% of the dry weight of the material). While mixing, the water content should be checked continuously by the flow ring test, see flow rate according to Weber standard in table above. Also ensure that the material is correctly mixed, and that the mixture is homogenous and free from separation. It is important to add the stipulated amount of water as excess water will reduce surface strength, increase shrinkage and encourage segregation. Conversely reduced water content increases viscosity. The temperature of the mix should ideally be between +10°C and 30°C. Once mixed, the compound remains workable for approx. 15-20 minutes under ideal working conditions but no further water should be added. Under too high temperature, the compound remains workable considerably shorter.

MIXING BY HAND
Mixing is done in a larger mixing drum or mixer with room for 3-4 bags of dry material per batch, giving a total volume of 60-80 liters. First pour parts of the water into the mixing drum, then add weberfloor 4686N Marine Extra Light. When emptying the bags into the mixing drum, keep it in under pressure with a vacuum cleaner to reduce dust. Pour in the rest of the mixing water. The material and water should be mixed using a powerful mixer or drill fitted with a paddle or a beater for minimum 2 minutes, until a homogenous, lump-free and low viscosity consistency is achieved.

MIXING BY PUMP
weberfloor 4686N Marine Extra Light should ideally be mixed and applied using a Weber approved mixing pump. Contact Weber for more information.

The mixed product should be distributed over the surface using a steel trowel, toothed or flat spatula or spiked roller. weberfloor 4686N Marine Extra Light should be applied within 24 hours after the primer has cured to ensure proper adhesion.

HAND APPLICATION
For application pour the mixed product into smaller mixing buckets. Start in the farther end of the work area and distribute the mixed screed in parallel with an end wall, finishing by an exit/opening, using a steel trowel, toothed or flat spatula or spike roller to assist the levelling process and achieve a smooth surface. If possible, use two mixing buckets to ensure there is always fresh screed available during the application. The half-cured screed can easily be formed and scraped, therefore do not wait too long with necessary fine adjustments. Any fine adjustment after the screed has cured requires advanced grinding equipment.

MACHINE APPLICATION
The screed should be pumped onto the prepared substrate in lengths. Every new length is applied as soon as possible in order for the screed to flow together to create a uniform layer. During application use a steel trowel, toothed or flat spatula or spiked roller to assist the levelling process and achieve a smooth surface, and to avoid foam and hose marks. The maximum width of the pumpable area varies from approx. 6-8 meters depending on the capacity of the pump and the layer thickness. Wider areas should be temporarily divided with separate stop-ends. Pumping is carried out in sections as a new section is pumped as quickly as possible slightly on top of the adjacent section. If an extremely levelled floor is required it is important to keep the pumpable width as small as possible. weberfloor 4965 is used as temporary stop-ends. Always line up the stop end. Ensure that floor drains, holes etc. are properly sealed off prior to application to avoid clogged drains and pipes. The half-cured screed can easily be formed and scraped, therefore do not wait too long with necessary fine adjustments. Any fine adjustment after the screed has cured requires advanced grinding equipment. The ideal length of the pump hose should be between 40 and 100 meters depending on the type of pump.

weberfloor 4686N Marine Extra Light allows foot traffic after approx. 3-5 hours. Before laying the floor covering it should always be checked that the structure has dried out sufficiently for the chosen type of floor covering. weberfloor 4686N Marine Extra Light can be over laid with a floor covering after approx. 1-3 days provided the floor covering will withstand minimum 85% RH, comply with the requirements from the floor covering manufacturer. The stated drying time assumes good drying out conditions of 20°C, 50% RH and an exchange of air. The surface can be over laid with stone and ceramics in dry conditions after approximately 24 hours.

The underlayment should not be used without final floor finish. Cover within 7 days. If not possible to cover with final floor finish within 7 days, cover with temporary covering such as plastic foil, waxed paper, geotextile with plastic backing to prevent the screed from drying out too much increasing the risk for shrinkage cracks. Ensure that all overlaps in the covering and floor-to-wall joints are properly sealed off and tight. weberfloor 4686N Marine Extra Light is self-drying, and dries out and cures from within, which means it quickly attains a surface strength and that surplus water is chemically bonded over time. If the surface is not covered in time, moisture that the screed needs internally to cure properly evaporates into the air. The surface may be primed with weberfloor 4716 diluted 1:5 with 1 part of primer and 5 parts of clean water to prevent the screed from too rapid drying out.

Tools and machinery should be cleaned for fresh material using water. Hardened material should be removed mechanically. To check that the screed has been installed according to the manufacturer’s instructions, it is possible to measure the surface tensile strength. After 28 days curing the value should be > 1,0 N/mm² (MPa). Contact Weber for more details. Dehumidifiers should not be used for the first two days after application. Gas heating should not be used prior to priming and application. Please observe that slow drying out due to low temperatures could affect the performance of the material.

See current Material Safety Data Sheet.

Since there are different conditions and requirements that apply in any case, Saint-Gobain Byggevarer AS cannot be liable for other than the information provided in this product datasheet. Examples of information and conditions beyond Saint-Gobain Byggevarer AS’s responsibility (if specially pointed out or not), involves storage, construction, preparation, how the product works together with other products, workmanship and locale conditions. The information provided in this product data sheet is based on our current knowledge and experience about the product. All of the above information must be considered as guidelines. It is the user’s responsibility to ensure that the product is suitable for the intended use, and also to perform acceptance check and self-inspection control. The user is responsible if the product is used for purposes other than recommended or for improper installation.