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FREQUENTLY ASKED QUESTIONS

No Hydro is manufacturing a range of high quality dampproofing and waterproofing products.

Find answers you can trust to all your questions by browsing our frequently asked questions. Direct answers from the manufacture for peace of mind, all questions are answered by No Hydro’s fully qualified C.S.S.W & C.S.R.T surveyors. If you would like more information on products or the question is not listed please contact us.

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No Hydro Damp Proofing Cream

Does damp proof cream work?

Yes, damp proofing cream is a highly effective form of treatment for rising damp. It is important that there is 20% or more active ingredient in the cream.

What is damp proofing cream?

Damp Proofing Cream a ready-to-use silane/siloxane damp proof injection cream that has been designed to create an effective barrier against rising damp in existing buildings.

How long does it take for DPC cream to work?

When injecting a damp proof course into dry walls DPC cream will take up to four weeks to fully cure, if injected into wet walls this process may take 6 to 8 weeks.

How long does damp proofing take?

Damp proofing can be done quick and efficiently because of new technology. Small jobs can take 1 to 2 hours and larger jobs can be completed in approximately 6 to 7 hours.

Can I do damp proofing myself?

Yes, most damp proofing creams have been designed with both contractors and the public in mind. Please refer to the datasheet for application guidelines.

How long does damp proofing cream last?

Damp proofing cream with over 20% active ingredient last for at least 25 to 30 years.

How can you stop rising damp?

Install a damp proof course, once a DPC is injected all the ingredients activate and spread through the pores of the cement motor line, with the specially formed ingredients it cures to form a physical damp proof course protecting the treated walls against rising damp

No Hydro Masonry Protection Cream

Can Masonry Protection Cream be applied over render?

Yes, masonry protection cream is suitable to be used on rendering. However if there is paint applied to the rendering unfortunately the waterproofing cream would not work. 

Can I power wash after applying Masonry Protection Cream?

Yes, after 1 month of masonry protection cream application the product will be fully cured. Once the cream has cured you can power wash the walls.

Note: you may notice that the surface beading effect has lessened however this will not stop the effectiveness of the masonry protection cream. 

Can Masonry Protection Cream be applied on pebbledash?

Yes, masonry protection cream can be applied to pebbledash. However if there is paint applied to the pebbledash unfortunately the waterproofing cream would not work.

Do I need to mix or stir Masonry Protection Cream before use?

Yes, we always recommend you mix or stir to ensure that the ingredients are thoroughly mixed.

How is Masonry Protection Cream Applied?

Masonry protection cream can be applied by brush, roller or spray.

Can Masonry Protection Cream be applied to roughcast?

Yes, masonry protection cream can be applied to roughcast. However if there is paint applied to the roughcast unfortunately the waterproofing cream would not work.

Can Masonry Protection Cream be applied to granite?

Yes, masonry protection cream can be applied to granite.

Can I apply a biocide for moss, algae or mould on an exterior wall?

No Hydro are currently developing a Masonry Biocide that will be available soon, this can be applied before the application of Masonry Protection Cream.

Will Masonry Protection Cream prevent dirt build up?

Yes, once applied masonry protection cream will provide a colourless breathable water proofing barrier, this will prevent any moisture from absorbing, this will then reduce the dirt build up.

What season is Masonry Protection Cream best applied in?

You can apply masonry protection cream in all seasons but always follow the datasheet recommendations. It is recommend applying with a minimum application temperature of 5°c and no rain is forecast for the next 24 hours.

Can Masonry Protection Cream be applied to wet walls?

When using masonry protection cream we recommend applying 24 hours after rainfall and 24 hours before any rain is forecast.

Can Masonry Protection Cream be applied to engineering bricks?

Yes, masonry protection cream can be applied to engineering bricks.

Can Masonry Protection Cream be applied to tiles?

Yes, masonry protection cream can be applied to some tiles like concrete and clay tiles, however it would not be suitable for painted tiles, glazed clay tiles and engobe clay tiles. 

Can I paint over Masonry Protection Cream?

Yes, masonry protection cream can be painted over with a water based exterior grade emulsion masonry paint. 

No Hydro highly recommended you to paint over masonry protection cream within 3-10 days of application. If application is after 3-10 days the surface beading which develops can inhibit the paint adhering to the surface.

How do you treat externally damp walls?

The most common dampness on external walls is penetrating damp / rain penetration. You can treat penetrating damp and damp proof bricks by applying masonry protection cream.

No Hydro Masonry Water Seal

Can masonry water seal be applied in cold conditions?

Masonry water seal has a minimum application temperature of 5°c, however the manufacture minimum temperature we can advise is 3°c. Masonry water seal should not be stored in temperatures below 3°c.

No Hydro Salt Inhibitor

How do you use salt inhibitors?

First Coat: Prepare 3 parts sand and 1 part cement using the dilute No Hydro Salt Inhibitor solution.

Second Coat: The mix is as for the first coat except that water is used instead of No Hydro Salt Inhibitor solution. This is applied as a further 12 mm coat, giving a total thickness of 24 mm for both coats.

Final Coat: This should consist of a 3 mm layer of gypsum skim finish or similar finish. Other finishes are acceptable provided that they are porous.

No Hydro Tanking Slurry

What is tanking slurry?

Tanking slurry is a cementitious waterproofing system which creates a monolithic bond using crystalline chemicals when applied to concrete and masonry structures.

How thick should tanking slurry be?

Tanking slurry is a minimum 2 coat application, with each layer applied at a uniform thickness of at least 1 mm per coat.

Does tanking slurry work?

Yes, tanking slurry waterproofs against positive and negative hydrostatic heads of water and is suitable for use, internally, externally, above and below ground.

How long does it take for tanking slurry to dry?

Curing procedures should be strictly adhered to. It is important that the surface of the slurry is protected from strong sunlight and drying winds, with either a suitable curing compound, polythene sheeting, damp hessian or similar, for a minimum of 48 hours.

If Tanking Slurry will be left unprotected, fine mist spray the surface 3 – 4 times daily, for a a minimum of 48 hours.

Can I dot and dab over tanking slurry?

Yes. however make sure you leave the tanking slurry to dry for at least 7 days before applying plaster boards.

How much tanking slurry do I need?

A 20KG bag of cementitious tanking slurry will cover up to 7 m2 at a 2mm thickness. Refer to coverage calculator for more information.

Can you paint over tanking slurry?

Yes, you must treat tanking slurry like new plaster. Allow the application to dry completely and only use water based emulsion paint in the first 6 months after initial application.

Is tanking slurry waterproof?

Tanking slurry is a cementitious waterproofing system for above and below ground surfaces. When mixed with clean water and applied correctly to a damp surface, it is designed to form a permanent waterproof coating to concrete and masonry.

What is tanking slurry used for?

Tanking slurry is a waterproofing barrier against positive and negative hydrostatic heads of water and is suitable for use, internally, externally, above and below ground.

Damp proofing of: A permanent damp-proof course, particularly on rubble filled walls.

Waterproofing of: Basements, cellars, swimming pools, brickwork, block work structures, concrete and renders.

Can you use tanking slurry on painted walls?

No tanking slurry cannot be applied to painted walls, all surfaces must be free from existing coatings or contamination e.g paint, oil, dirt, and other loose materials.

Can you use tanking slurry outside?

Yes tanking slurry is suitable for use, internally, externally, above and below ground.

Products

Can Masonry Protection Cream be applied over render?

Yes, masonry protection cream is suitable to be used on rendering. However if there is paint applied to the rendering unfortunately the waterproofing cream would not work. 

Can I power wash after applying Masonry Protection Cream?

Yes, after 1 month of masonry protection cream application the product will be fully cured. Once the cream has cured you can power wash the walls.

Note: you may notice that the surface beading effect has lessened however this will not stop the effectiveness of the masonry protection cream. 

Can Masonry Protection Cream be applied on pebbledash?

Yes, masonry protection cream can be applied to pebbledash. However if there is paint applied to the pebbledash unfortunately the waterproofing cream would not work.

Do I need to mix or stir Masonry Protection Cream before use?

Yes, we always recommend you mix or stir to ensure that the ingredients are thoroughly mixed.

How is Masonry Protection Cream Applied?

Masonry protection cream can be applied by brush, roller or spray.

Can Masonry Protection Cream be applied to roughcast?

Yes, masonry protection cream can be applied to roughcast. However if there is paint applied to the roughcast unfortunately the waterproofing cream would not work.

Can Masonry Protection Cream be applied to granite?

Yes, masonry protection cream can be applied to granite.

Can I apply a biocide for moss, algae or mould on an exterior wall?

No Hydro are currently developing a Masonry Biocide that will be available soon, this can be applied before the application of Masonry Protection Cream.

Will Masonry Protection Cream prevent dirt build up?

Yes, once applied masonry protection cream will provide a colourless breathable water proofing barrier, this will prevent any moisture from absorbing, this will then reduce the dirt build up.

What season is Masonry Protection Cream best applied in?

You can apply masonry protection cream in all seasons but always follow the datasheet recommendations. It is recommend applying with a minimum application temperature of 5°c and no rain is forecast for the next 24 hours.

Can Masonry Protection Cream be applied to wet walls?

When using masonry protection cream we recommend applying 24 hours after rainfall and 24 hours before any rain is forecast.

Can Masonry Protection Cream be applied to engineering bricks?

Yes, masonry protection cream can be applied to engineering bricks.

Can Masonry Protection Cream be applied to tiles?

Yes, masonry protection cream can be applied to some tiles like concrete and clay tiles, however it would not be suitable for painted tiles, glazed clay tiles and engobe clay tiles. 

Can I paint over Masonry Protection Cream?

Yes, masonry protection cream can be painted over with a water based exterior grade emulsion masonry paint. 

No Hydro highly recommended you to paint over masonry protection cream within 3-10 days of application. If application is after 3-10 days the surface beading which develops can inhibit the paint adhering to the surface.

What is tanking slurry?

Tanking slurry is a cementitious waterproofing system which creates a monolithic bond using crystalline chemicals when applied to concrete and masonry structures.

How thick should tanking slurry be?

Tanking slurry is a minimum 2 coat application, with each layer applied at a uniform thickness of at least 1 mm per coat.

Does tanking slurry work?

Yes, tanking slurry waterproofs against positive and negative hydrostatic heads of water and is suitable for use, internally, externally, above and below ground.

How long does it take for tanking slurry to dry?

Curing procedures should be strictly adhered to. It is important that the surface of the slurry is protected from strong sunlight and drying winds, with either a suitable curing compound, polythene sheeting, damp hessian or similar, for a minimum of 48 hours.

If Tanking Slurry will be left unprotected, fine mist spray the surface 3 – 4 times daily, for a a minimum of 48 hours.

Can I dot and dab over tanking slurry?

Yes. however make sure you leave the tanking slurry to dry for at least 7 days before applying plaster boards.

How much tanking slurry do I need?

A 20KG bag of cementitious tanking slurry will cover up to 7 m2 at a 2mm thickness. Refer to coverage calculator for more information.

Can you paint over tanking slurry?

Yes, you must treat tanking slurry like new plaster. Allow the application to dry completely and only use water based emulsion paint in the first 6 months after initial application.

Is tanking slurry waterproof?

Tanking slurry is a cementitious waterproofing system for above and below ground surfaces. When mixed with clean water and applied correctly to a damp surface, it is designed to form a permanent waterproof coating to concrete and masonry.

What is tanking slurry used for?

Tanking slurry is a waterproofing barrier against positive and negative hydrostatic heads of water and is suitable for use, internally, externally, above and below ground.

Damp proofing of: A permanent damp-proof course, particularly on rubble filled walls.

Waterproofing of: Basements, cellars, swimming pools, brickwork, block work structures, concrete and renders.

Can you use tanking slurry on painted walls?

No tanking slurry cannot be applied to painted walls, all surfaces must be free from existing coatings or contamination e.g paint, oil, dirt, and other loose materials.

Can you use tanking slurry outside?

Yes tanking slurry is suitable for use, internally, externally, above and below ground.

Does damp proof cream work?

Yes, damp proofing cream is a highly effective form of treatment for rising damp. It is important that there is 20% or more active ingredient in the cream.

What is damp proofing cream?

Damp Proofing Cream a ready-to-use silane/siloxane damp proof injection cream that has been designed to create an effective barrier against rising damp in existing buildings.

How long does it take for DPC cream to work?

When injecting a damp proof course into dry walls DPC cream will take up to four weeks to fully cure, if injected into wet walls this process may take 6 to 8 weeks.

How long does damp proofing take?

Damp proofing can be done quick and efficiently because of new technology. Small jobs can take 1 to 2 hours and larger jobs can be completed in approximately 6 to 7 hours.

How do you treat externally damp walls?

The most common dampness on external walls is penetrating damp / rain penetration. You can treat penetrating damp and damp proof bricks by applying masonry protection cream.

Can I do damp proofing myself?

Yes, most damp proofing creams have been designed with both contractors and the public in mind. Please refer to the datasheet for application guidelines.

How long does damp proofing cream last?

Damp proofing cream with over 20% active ingredient last for at least 25 to 30 years.

How can you stop rising damp?

Install a damp proof course, once a DPC is injected all the ingredients activate and spread through the pores of the cement motor line, with the specially formed ingredients it cures to form a physical damp proof course protecting the treated walls against rising damp

Can masonry water seal be applied in cold conditions?

Masonry water seal has a minimum application temperature of 5°c, however the manufacture minimum temperature we can advise is 3°c. Masonry water seal should not be stored in temperatures below 3°c.

How do you use salt inhibitors?

First Coat: Prepare 3 parts sand and 1 part cement using the dilute No Hydro Salt Inhibitor solution.

Second Coat: The mix is as for the first coat except that water is used instead of No Hydro Salt Inhibitor solution. This is applied as a further 12 mm coat, giving a total thickness of 24 mm for both coats.

Final Coat: This should consist of a 3 mm layer of gypsum skim finish or similar finish. Other finishes are acceptable provided that they are porous.

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