Arc High-Build Floor Levelling Compound

Arc High-Build is a free flowing, fast setting, fibre reinforced, protein free, shrink-age compensated cement based formulation, designed for smoothing and levelling sub-floors prior to installation of floor coverings. High Build can be applied from depths of feather-edge to 50mm in one application and is suitable for use on all common substrates including underfloor heating and plywood overlay. High Build is fast setting and is ready to be tiled after 3 hours at 20°C. It is ready to receive floor coverings such as vivyl, linoleum, carpet and resin after 24 hours at 20°C.

 

• Apply from feather-edge to 50mm in one pour

• Single part, no additives required

• Ideal for underfloor heating and plywood

• Tile after 3 hours

• Fibre reinforced and flexible

• Protein free

• Shrinkage compensated

• Pumpable

• High durability

 

For smoothing screeds and a variety of floor surfaces. The high polymer and fibre formulation make High Build ideal for preparing a surface prior to the installation of a new covering. It is suitable for use on all common substrates including: sand/cement screeds, concrete, sound asphalt & bitumen, anhydrite screed, ceramic, quarry & natural stones, underfloor heating, plywood overlay and timber boards. Due to the strength of the formulation, High Build can be applied to a depth of 50mm in one application, ideal when preparing a substrate to lay underfloor heating, wooden block, laminate, ceramic tiles, natural stone, vinyl, parquet, cork, carpet or painting.

 

Surfaces must be clean, firm, dry, free from dust, dirt, oil and grease. Remove any loose or flaking layers. Laitance should be removed from concrete surfaces. The substrate must be strong enough to support the weight of the leveller, adhesive and covering. Sub-floors directly to earth must have a damp-proof membrane. Underfloor heating must be switched off 48 hours prior to application. Once High Build has been applied, allow 7 days before switching the underfloor heating back on, initially at a low temperature, increased slowly on a daily basis. 

Ensure new concrete is confirmed dry via consistent moisture readings across the whole surface. Sand/Cement screeds must have a moisture reading of less than 75% RH before work can commence, If it is a new screed, allow 1 day per mm for drying. Remove any laitance from the surface mechanically and remove all dust ideally by vacuum. It is necessary to prime sand/cement screeds to maintain the flow life and prevent air bubbles rising to the surface. Prime with Arc Tilers Primer diluted 3 parts water to 1 part Primer. Very porous substrates will require more than one coat.

ANHYDRITE/GYPSUM SCREED: 

Ensure the Anhydrite/Gypsum screed is confirmed dry via consistent moisture readings across the whole surface. Anhydrite screeds must have a moisture reading of less than 75% RH before work can commence. If it is a new screed, allow 1 day per mm for drying. Remove any laitance from the surface mechanically and remove all dust ideally by vacuum. Anhydrite/Gypsum screeds must be sealed prior to applying High Build by applying 2 coats of Arc Tilers Primer, the first diluted 3 parts water to 1 part Primer followed by a neat coat. Allow to dry in between coats.

Plywood must be 18mm (minimum), exterior grade, screwed (not nailed) to the substrate at 150mm centres. Ensure there is sufficient ventilation beneath substrate and that the substrate is strong enough to support the weight of the leveller, adhesive and the final covering being applied. Make sure surface is free of loose dirt and dust. Exposed edges and joints must be primed with neat Arc Tilers Primer. Prime the remainder of the substrate with Arc Tilers Primer diluted 3 parts water to 1 part Primer.

Follow the instructions on Arc Tilers Primer Plus. If using another recommended primer follow the manufacturer’s instructions.

 

Mix by adding powder to water, approximately 4.5 – 5 litres of water to 20kg of High Build. We suggest starting at 4.5 litres of water which can then be increased to a maximum of 5 litres if necessary. Do not exceed 5 litres of water. Exceeding 5 litres of water per unit will result in water bleed and therefore extended drying times and a weakened mix. Mix ideally with an electric paddle until you obtain a lump free compound similar in consistency to single cream. When mixed allow to stand for 2 minutes and stir again before application. It will remain workable in the bucket for 25-30 minutes, depending on conditions. Pour a small quantity onto the prepared surface and trowel down lightly. High Build will start to cure 1-2 hours after application. The successive laying of coverings is possible after drying (12-24 hours depending on the ambient temperature and humidity). If you wish to build to a greater depth of 50mm, allow to dry and prime between applications. Setting time will depend on atmospheric temperatures. It will be slowed by lower temperatures and accelerated by higher temperatures. Once applied, the drying process can begin after 10-15 minutes depending on the surface porosity and ambient temperature.

Tools must be cleaned in water thoroughly immediately after use. HIGH BUILD MUST BE LEFT TO DRY BEFORE APPLYING THE FINAL DECORATIVE SURFACE FLOORING. This is typically after 3 hours for tiles and 24 hours for soft flooring, however, it can vary and can be faster depending on the choice of surface flooring. The critical moisture content for the flooring in question must be observed. The use of spiked roller will help remove entrapped air and will improve the surface finish.

 

High Build is ideal for pump application. Mix in accordance with the pump manufacturer’s instructions. Regular flow checks should be carried out. Ensure the water contents are correct and there is no surface separation.