The best waterproofing is the kind you never have to think about again, because it is built into the structure itself. That is exactly what integral waterproofing does. Instead of relying only on a coating applied over the surface, you add a liquid compound into the concrete and plaster while they are being mixed, so the material becomes water-resistant from the inside out.

For homes and buildings across Panchkula and the Tricity, this is one of the smartest and most cost-effective steps you can take during construction. This guide explains what integral waterproofing is, what Dr. Fixit LW+ does, where to use it, and how to mix it correctly. For the wider picture of how this fits with the rest of your waterproofing, see our complete waterproofing guide for Panchkula.

What integral waterproofing actually is

Concrete and cement plaster are full of tiny capillary pores. Left untreated, those pores pull water into the material and let it travel through, which is how dampness spreads and how steel reinforcement begins to corrode. Integral waterproofing tackles this at the source.

An integral waterproofing admixture is a liquid you add to the mixing water. Once it is in the mix, it makes the concrete or plaster more cohesive, reduces the amount of water the mix needs, and blocks those capillary pores so the finished material absorbs far less water. Because the protection is part of the material and not a layer on top, it cannot peel, wear off, or be scraped away.

Think of it as the base layer of a good waterproofing system. It does not replace a terrace membrane or a bathroom coating, but it makes everything you build far more resistant to water from day one.

What Dr. Fixit LW+ does

Dr. Fixit LW+, sold in full as Dr. Fixit Pidiproof LW+, is one of the most widely used integral liquid waterproofing compounds in India. It is a blend of surface-active plasticising agents, polymers and additives made to be mixed into concrete, mortar and plaster.

Added to the mix, it does several things at once:

  • Reduces water permeability, so the concrete or plaster resists seepage and dampness
  • Makes the mix more cohesive and helps prevent segregation and bleeding
  • Reduces shrinkage cracks in plaster and concrete
  • Helps protect steel reinforcement against corrosion
  • Improves workability, making the mix easier to place and finish

It is compatible with most cements and works with river sand as well as manufactured sand (M-Sand).

Where to use integral waterproofing

Because it goes into the mix, Dr. Fixit LW+ can be used almost anywhere concrete, mortar or plaster is being laid. Common applications include:

  • Structural concrete: foundations, columns, beams, retaining walls and roof slabs
  • Internal and external wall plaster, to stop dampness and the bubbling paint that follows it
  • Water tanks, sumps and basements
  • Bathroom and balcony floor screeds
  • Brick and block joint mortar

In short, anywhere water is a risk and the surface is being freshly cast or plastered, integral waterproofing belongs in the mix.

How to use Dr. Fixit LW+ step by step

The result you get depends on mixing it correctly. The method is simple, but a few points make all the difference.

Dosage

The manufacturer’s standard dosage is around 200 ml of Dr. Fixit LW+ per 50 kg bag of cement, which works out to roughly 1 litre for every 5 bags. Always check the current pack label or technical datasheet, since the exact figure can vary by product variant and application. Do not exceed the recommended dose in the belief that more is better, as overdosing can affect the mix.

The mixing steps

  1. Mix the cement, sand and aggregates together in a dry state first.
  2. Measure the correct dose of Dr. Fixit LW+ and add it to the clean mixing water. Never add it directly to the dry cement.
  3. Add the water containing the compound to the dry mix and mix thoroughly for a few minutes until the concrete or mortar is smooth and cohesive.
  4. Keep the water-cement ratio as low as workability allows. Adding extra water defeats the purpose.
  5. Place the concrete or apply the plaster as normal, then cure it properly.

Do not skip curing

Curing matters as much as the admixture. Good curing lets the concrete develop its full strength and density, which is a big part of what keeps water out. Cure as you would for any quality concrete work.

Where integral waterproofing is not enough on its own

Integral waterproofing is a powerful first line of defence, but it is not the whole system. Areas that face standing water or constant wetting still need a surface membrane on top.

Used together, integral protection inside the structure and a surface membrane over the wet areas give you waterproofing that lasts.

Other integral waterproofing products we stock

Dr. Fixit LW+ suits most everyday concrete and plaster work, but there are specialised options for particular jobs, and we can help you choose between them:

  • Dr. Fixit LW+ Super: a version formulated to work well with M-Sand, improving workability and compaction where manufactured sand is used.
  • Crystalline admixtures such as Dr. Fixit Polyplus CP and Sika WT-200 P: these react with moisture inside the concrete to grow crystals that block the pores and can help seal fine cracks over time. They suit water-retaining and below-ground structures like tanks, basements and foundations.
  • Sika Plastocrete range: liquid integral admixtures that combine plasticising and waterproofing, used across structural concrete and plaster.

We stock the Dr. Fixit and Sika construction chemicals for all of these. If you are not sure which admixture fits your job, tell us what you are casting and we will point you to the right one.

Common mistakes to avoid

  • Adding it to dry cement. Always mix the compound into the water first, never straight onto the cement.
  • Overdosing. More admixture does not mean more waterproofing. Stick to the recommended dose.
  • Adding extra water for workability. A high water-cement ratio weakens the concrete and works against the waterproofing. Keep it low.
  • Skipping curing. Poorly cured concrete stays porous no matter what you added to it.
  • Relying on it alone for wet areas. Terraces, tanks and bathrooms still need a surface system as well.

Buy Dr. Fixit LW+ and integral waterproofing in Panchkula

Whether you are casting a slab, plastering a wall, or building a tank, we can supply the right integral waterproofing admixture and advise on the quantity for your job. Khandelwal Trading Co. stocks the Dr. Fixit and Sika ranges and serves Panchkula, Chandigarh, Mohali and the wider Tricity.

  • Visit: Shop No. 4, Street No. 2, Maheshpur, Sector 21, Budanpur, Panchkula, Haryana 134117
  • Call: 94175 65977
  • WhatsApp: message us here
  • Trade enquiry: get a quote

Frequently asked questions

What is integral waterproofing?

It is waterproofing that is mixed into the concrete or plaster rather than coated on top. A liquid admixture like Dr. Fixit LW+ reduces permeability and blocks the pores, so the material resists water from within and cannot peel or wear off.

How much Dr. Fixit LW+ do I add per bag of cement?

The standard dosage is around 200 ml per 50 kg bag of cement, roughly 1 litre for every 5 bags. Add it to the mixing water, not the dry cement, and always confirm against the current pack or datasheet.

Does integral waterproofing replace a terrace or bathroom coating?

No. It is the base layer that makes the whole structure more water-resistant, but areas exposed to standing water, such as terraces, tanks and bathrooms, still need a surface membrane on top.

Can I add it to plaster as well as concrete?

Yes. It is commonly used in internal and external wall plaster to prevent dampness and the bubbling paint that comes with it, as well as in structural concrete and mortar.

Will it make the concrete weaker?

Used correctly it does not. It actually improves cohesion and workability while keeping strength within specification. Problems come from overdosing or adding extra water, so keep to the recommended dose and a low water-cement ratio.