BAL External Bedding Mortar 25kg

Description

BAL External Bedding Mortar is a special cement with graded fillers for producing a mortar bed for external use, which allows external pavers and tiles to be fixed to the requirements of BS 7533-4.

BAL External Bedding Mortar is for use in external dry or wet installations, and has been developed for laying a mortar bed before fixing external pavers and tiles. It is suitable for a bed depth from 10mm (Min 25mm on MOT Type 1) up to 100mm thickness.

BAL External Bedding Mortar comes in grey, in 25kg bags.

Key Features:

• Can be laid from 10mm-100mm
• > 1hr working time at 20°C
• Walkable in 12 hours
• Freeze/thaw resistant
• Just mix with water

Preparation:
Substrates to receive BAL External Bedding Mortar be of a suitable Type 1 MOT grade laid to the correct depth and be fully compacted. The sub-base should be stable and not liable to settlement. The application thicknesses detailed above relate to rigid, stable substrates.

All external pavers and tiles should be free of standing or pooling water. This is usually achieved by sloping the external pavers and tiles in one direction to guide the surface water towards a suitable disposal point, i.e., a gully, linear drain, or the edge of the terrace or patio, but wherever possible, surface water is directed away from any buildings. All external pavers and tiles require a stable base.

Mixing:
A single 25kg bag of BAL External Bedding Mortar should be mixed with 2 litres of water to provide a semi-dry consistency. When a sample of mixed mortar is squeezed in the hand, the sample should retain its shape and not crumble, the gloved hand being left slightly moist.
When a sample is compacted on the base, no film of water should form on the surface.
Mixing should be carried out using a pan, trough or other forced action type mixer. please note: Normal ‘free-‘fall’ mixers are not suitable for mixing semi-dry screed mortars. Use clean equipment and do not use other cement, lime or screed additives etc., in the mix.

Preparation:
For an unbonded mortar bed laid on a Type 1 MOT sub-base or as a semi-dry bonded screed onto a mature concrete base in an external environment, it is good practice to ensure that adequate falls have been introduced into the sub-grade or concrete. This is to allow water to drain away on the paving, thus avoiding any ponding. Where the patio is adjacent to the house, particular attention should be paid to drainage, and the patio’s height must be significantly below that of any damp proof courses. It is important to note that the supporting sub-base is stable and not liable to settlement. Note: When applying to concrete substrates and Type 1 MOT sub-bases, the concrete substrate or Type 1 MOT sub-base should be primed with 2-3mm of BAL External Priming Slurry Bond with the mortar applied to the wet slurry. Further advice may be found in the relevant British Standard.

The working time of the mixed BAL External Bedding Mortar is in excess of 1hr at 20°C. The amount of mortar mixed and the area to be screeded should be limited so that trowelling off, finishing and tile fixing can be completed within the working time. Where a new bay is laid against a set and hardened mortar bed, it is recommended that such daywork joints are vertical and treated with the BAL External Priming Slurry Bond, with the BAL External Bedding Mortar applied onto the wet slurry.

Thickness:
On concrete substrates, BAL External Bedding Mortar should be applied as required between min. 10mm to max. 100mm thicknesses.
On Type 1 MOT sub-bases, BAL External Bedding Mortar should be applied as required between min. 25mm to max. 100mm thicknesses. Substrates to receive BAL External Bedding Mortar should be of a suitable Type 1 MOT grade laid to the correct depth and be fully compacted.
The sub-base should be stable and not liable to settlement. The application thicknesses detailed above relate to rigid, stable substrates.

Installation of Pavers/Tiles:
To fix an external paver or tile, when the mortar is still wet (<1hr at 20°C), apply BAL External Priming Slurry Bond to the mortar using a brush, roller or trowel. Also, apply BAL External Priming Slurry Bond to the back of the porcelain tile to give 100% coverage and a total slurry depth of 2-3mm before bedding the porcelain tile into the wet mortar. Adjust the position of the porcelain as required and tap in using a rubber mallet. Apply BAL External Bedding Mortar at temperatures of a minimum of 5°C and rising.

Product Datasheet

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