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Stormdry Repointing Additives (500 ml)

£21.58 – £27.10

  • Waterproof repointing additives
  • Additive No.1 breathable waterproofing
  • Additive No.2 enhanced flood protection
  • Concentrated products (dilute with water before use)
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Stormdry Repointing Additives (500 ml)
£21.58 – £27.10

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Stormdry Repointing Additives (500 ml)
£21.58 – £27.10


Stormdry Repointing Additives (500 ml)

A certain amount of repointing will usually be necessary when dealing with rain penetration problems in masonry walls. This is because small cracks in the mortar course and cracks in the interface between the mortar and brick/stone can acts as pathways through which rain can penetrate. In many cases, only localised sections of mortar will require repointing. However, where the mortar is in particularly poor condition it may be necessary to repoint the whole wall.

Stormdry Repointing Additives are designed to enhance the waterproofing characteristics of mortar mixes used for repointing. They are diluted with water before being used as a gauging solution. Two types are available:

Stormdry Repointing Additive No.1 –

Is a concentrated liquid that is to be used as a diluted part of the gauging solution in sand and cement mortar. It is used for repointing before a Stormdry Masonry Protection Cream application. It enhances the waterproofing qualities of a standard sand and cement mortar mixture whilst still allowing it to breathe.

Stormdry Repointing Additive No. 2 –

This repointing additive is polymer modified giving allowing it to impart excellent waterproofing characteristics to repointing mortars and enhanced bonding characteristics between the brick/stone and the mortar. Unlike Stormdry Repointing Additive No. 1 this additive does not allow the mortar to breathe.

Additional information

Weight 0.5 kg
Dimensions 16 × 6 × 6 cm
Options: No selection

Repointing Additive No.1, Repointing Additive No.2
Brand: No selection

Stormdry

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No.1 Application

Application for Stormdry Repointing Additives No.1:

Joints should be raked out squarely to a depth of twice their width. This should result in a depth of approximately 15 – 25 mm, and never more than 35 mm. The joints should then be brushed out to ensure that the repointing mortar can form a good bond.

After shaking the bottle, Stormdry Repointing Additive No.1 should be diluted with clean tap water in the ratio 1 part Stormdry Repointing Additive No.1 to 9 parts water by volume. (Lime:sand mortars can be waterproofed using the same ratio of 1 part Stormdry Repointing Additives No.1 to 9 parts water by volume. Grade NHL 5 hydraulic lime should be used.) The resulting gauging solution should be added to the chosen sand:lime:cement mix or masonry cement/sand mix (see above) to attain workability.

To avoid shrinkage it is important to add the gauging solution carefully to ensure that only the minimum quantity necessary to attain workability is used. Once mortar has started to set and has become unworkable it should not be “knocked up” by adding more gauging solution. For this reason, only small batches of mortar should be mixed at a time.

Before the repointing mortar is applied, raked out mortar joints should be wetted – e.g. by flicking water using a wet brush. The repointing mortar should be applied into the raked out joint using a suitable pointing iron or repointing gun and tooled firmly. Where deep mortar joints are being repointed this may need to be done in two stages to achieve good compaction.

Wherever possible it is beneficial to tool the mortar to a “bucket handle” finish as this provides the best durability and weathertightness.

The curing time will depend to a large extent on the chosen repointing mix (e.g. mixes containing cement will cure more quickly than those based on pure lime). During the curing period mortar should be protected from frost and should be prevented from drying out too quickly. In dry, windy or warm weather it may be necessary to spray the surface of the wall occasionally or cover the wall with damp hessian to allow a proper set, particularly where a lime mortar has been used.

No.2 Application

Application for Stormdry Repointing Additives No.2:

Joints should be raked out squarely to a depth of twice their width. This should result in a depth of approximately 15 – 25 mm, and never more than 35 mm. The joints should then be brushed out to ensure that the repointing mortar can form a good bond.

After shaking the bottle, Stormdry Repointing Additive No.2 should be diluted with clean tap water before use in the ratio 1 part Stormdry Repointing Additive No.2 to 4 parts water by volume. (Lime:sand mortars can be waterproofed using the same ratio of 1 part Stormdry Repointing Additive No.2 to 4 parts water by volume. Grade NHL 5 hydraulic lime should be used.) The resulting gauging solution should be added to the chosen sand:lime:cement mix or masonry cement/sand mix (see above) to attain workability.

To avoid shrinkage it is important to add the gauging solution carefully to ensure that only the minimum quantity necessary to attain workability is used. Once mortar has started to set and has become unworkable it should not be “knocked up” by adding more gauging solution. For this reason, only small batches of mortar should be mixed at a time.

Before the repointing mortar is applied, raked out mortar joints should be wetted – e.g. by flicking water using a wet brush. The repointing mortar should be applied into the raked out joint using a suitable pointing iron or repointing gun and tooled firmly. Where deep mortar joints are being repointed this may need to be done in two stages to achieve good compaction.

Wherever possible it is beneficial to tool the mortar to a “bucket handle” finish as this provides the best durability and weathertightness.

The curing time will depend to a large extent on the chosen repointing mix (e.g. mixes containing cement will cure more quickly than those based on pure lime.) During the curing period mortar should be protected from frost and should be prevented from drying out too quickly. In dry, windy, or warm weather it may be necessary to spray the surface of the wall occasionally or cover the wall with damp hessian to allow a proper set, particularly where a lime mortar has been used.

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