Fosroc Conbextra Bedding Mortar

Fosroc Conbextra Bedding Mortar is easy to use with no primer required. It is a blend of Portland cements, chemical additives and graded aggregates, and produces a masonry mortar that is capable of giving a smooth finish. DWI approval no.: 56/4/1271.

Best Uses

Fosroc Conbextra Bedding Mortar is used for the structural bedding in of precast modular concrete units. It is supplied as a ready to use dry powder, and only requires the addition of clean water.

• Non-shrink
• High strength
• Chloride free
• Produces a masonry mortar capable of giving a smooth finish
• Easy to use no priming required
• Pre-blended to overcome site batching variations
• Low wastage due to ability to mix part packs
• Rapid strength gain
• Only addition of water required

Application

Always ensure that the substrate is clean, dry, free from oil, paint and any other contaminants that would prevent a good adhesion. To obtain maximum adhesion, remove any loose friable substrates by grit blast or grinding. Pre-soak the substrate with water ensuring that there is absolutely no free water prior to bedding in.

Mixing
Care should be taken to ensure Conbextra Bedding Mortar is thoroughly mixed. For hand applied applications a forced action mixer is required. For a single bag the product can be mixed in a drum using a Renderoc Mixing Paddle (MR4) and a slow speed (400 – 500 rpm) heavy duty drill. Part bags may be mixed but careful measurement of the mixing water is essential.

In all applications the powder is always to be added to the water, whilst continuously mixing. 3.0 - 3.25 litres of clean drinking water should be added to the mixing vessel for each 25kg bag of powder. To obtain the correct handling characteristics and product performance the mixing instructions should be followed.

Placing
Place the Bedding Mortar within 20 minutes of mixing in order to maintain workability. The mortar should be applied by trowel. Use a dampened steel trowel to finish.

Finishing
Material should be cut back whilst wet to the required profile by use of a hand trowel. Ensure all material is removed from the substrate whilst it is still wet.

Curing
On completion of the application, any exposed areas should be thoroughly cured with application of water and/or wet hessian.