UltraTech Weather Pro WP+200
An admixture that blocks water at the pore level, dosed into the mix rather than brushed on afterward.
What is it?
A liquid integral waterproofing admixture, dosed into concrete, plaster and mortar at the mixing stage, conforming to IS 2645 and IS 9103.
Where is it used?
Foundation and plinth concrete, RCC beams, columns and slabs, internal and external plaster, and brick-joint masonry mortar — including bathrooms, balconies and terraces before finishing.
Why use it?
It blocks the capillary pores that let water travel through hardened concrete and mortar, cuts mixing water by roughly 10-15%, and adds this protection without a separate site step or membrane.
How is it applied?
Dosed at 200 ml per 50 kg bag of cement, stirred into about half the gauging water, then blended into the batch before the rest of the water and dry materials go in.
About UltraTech Weather Pro WP+200
UltraTech Weather Pro WP+200 is the entry point into UltraTech’s Building Products waterproofing range — a liquid admixture that goes into the concrete, plaster or mortar mix itself, rather than being brushed or sprayed onto a finished surface afterward. On Indian sites, a large share of waterproofing complaints trace back to the plaster and RCC stage rather than a missing terrace membrane, so working inside the mix from the moment it’s poured has real value.
The product is built around what UltraTech calls Water Block Technology: an admixture that interrupts the fine, interconnected capillary channels that form inside cement paste as it hydrates. Water migrates through concrete and mortar mainly along this microscopic network rather than through any single crack, so disrupting it reduces seepage across the whole element, not just at a visible defect.
It’s specified most often for foundation and plinth concrete, RCC beams, columns and slabs, and — just as commonly — for internal and external plastering and brick-joint mortar, where seepage in bathrooms, balconies, terraces and boundary walls is a routine callback for contractors. Dosed by the bag of cement rather than measured out for a whole slab, it scales down comfortably to a single room’s plaster or a boundary wall’s brickwork, which is where much of India’s residential and small-contractor waterproofing decisions actually happen. It sits under the IS 2645 and IS 9103 framework that governs integral cement waterproofing compounds and concrete admixtures, giving specifiers a standard to write into a BOQ rather than relying on a brand claim alone.
The technical insight
The mechanism is chemistry, not a coating trick. WP+200 is mixed into roughly half the gauging water before that water meets the cement, sand and aggregate, so the active chemistry disperses evenly through the paste rather than sitting as a surface film. As hydration proceeds, it occupies the capillary pores that would otherwise link up into continuous water paths through the hardened matrix.
A useful side effect of this pore-blocking action is a reduction in the water demand of the mix — typically 10-15% for the same workability. A lower effective water-cement ratio is one of the most reliable ways to densify concrete and mortar, which is why users report a measurable lift in compressive strength alongside the waterproofing benefit: denser paste, fewer voids, and incidentally less path for chloride and carbonation ingress toward the reinforcement.
Standard dosage is 200 ml per 50 kg bag of cement, which keeps site-level maths simple regardless of batch size. Because IS 2645 (integral waterproofing compounds) and IS 9103 (concrete admixtures) test workability retention, permeability reduction and compressive-strength ratio rather than a single pass-fail leak test, WP+200 is best read as a batch-wide performance improver — not a guaranteed fix for one specific leak.
Where it is used
- Foundation and plinth concreting
- RCC beams, columns and slabs
- Internal and external plastering
- Brick-joint and masonry mortar
- Bathroom, balcony and terrace substrates before finishing
- Site-mixed concrete for residential and small-to-mid-size RCC works
Key advantages
- Works from inside the matrix, so it protects areas a topical membrane can’t reach cleanly — brick joints, plaster keys, embedded reinforcement
- Cuts mixing water by roughly 10-15% for the same workability, which densifies the mix as a side benefit
- Simple bag-based dosing (200 ml per 50 kg cement) that site labour can measure without special equipment
- Compliant with IS 2645 and IS 9103, giving consultants a recognised standard to specify against
- No separate curing or bonding step beyond normal concrete and plaster curing practice
- Affordable enough to dose into every batch of a pour rather than reserving waterproofing spend for one ‘critical’ area
Limitations & considerations
- An integral admixture densifies and blocks capillary pores; it is not a substitute for a dedicated membrane on a continuously ponded or submerged surface such as a water tank or a flat roof with standing water
- It cannot repair or bridge existing cracks — structural cracks and construction joints still need separate treatment
- Dosage is by weight of cement, not by feel; under- or over-dosing when small quantities are eyeballed on site reduces the benefit or affects workability
- Being mixed in, it cannot be inspected or corrected after the pour the way a topical coat can be reworked
- Does not address ground-side, vapour-pressure-driven dampness without a supporting damp-proof course
Selection & best practice
Measure WP+200 against the actual cement content of the batch, not the volume of concrete. Pre-mix it into roughly half the gauging water so it disperses before the dry materials go in, and keep dosing consistent across every batch of a pour — inconsistent dosing between batches is the most common reason a site sees patchy results from an otherwise correctly specified admixture.
Specifications
| Product type | Integral waterproofing liquid admixture |
| Technology | Water Block Technology (capillary pore-blocking admixture) |
| Governing standards | IS 2645 (integral waterproofing compounds) & IS 9103 (concrete admixtures) |
| Dosage rate | 200 ml per 50 kg bag of cement |
| Mixing method | Pre-mix into ~50% of gauging water, then blend into the batch |
| Water reduction | Approx. 10-15% for equivalent workability |
| Applicable mixes | Concrete, plaster and masonry mortar |
| Pack sizes | 200 ml, 1 L, 5 L, 10 L, 20 L, 50 L |
Industry use cases
Residential & individual home construction
RCC slab, foundation and external plaster on individual houses where a full membrane system isn’t in the budget but seepage protection still matters.
Plastering & masonry contractors
Mixed into brick-joint mortar and wall plaster to cut down repeat callbacks for damp patches in bathrooms, balconies and boundary walls.
Small to mid-size RCC/civil contractors
Dosed into site-mixed concrete for beams, columns and slabs on projects too small to justify RMC-grade admixture dosing systems.
Renovation & re-plastering work
Added when re-plastering a terrace parapet or balcony after an earlier seepage failure, alongside surface-level repair.
Frequently asked questions
Does WP+200 replace a waterproofing membrane on the terrace?
Is more WP+200 always better for extra waterproofing?
Can WP+200 be dosed into ready-mix concrete (RMC)?
How is this different from a brush-applied waterproofing coating?
How we position UltraTech Weather Pro WP+200
Within UltraTech’s building-products lineup, WP+200 is the practical, high-volume entry product for integral waterproofing — dosed into everyday RCC and plastering work rather than reserved for one critical wet area. Space Arc typically recommends it as the default admixture for foundation concrete, structural RCC and general plastering on residential and small-contractor projects, and steps up to dedicated crystalline admixtures, PU injection or membrane systems for basements, water tanks and terraces under continuous water exposure. It’s a foundation-level specification rather than a premium one — which is exactly its value: affordable enough to dose into every batch, not only the areas someone remembered to flag as waterproofing-critical.
Fosroc Conplast WL — A specifier already standardised on Fosroc’s admixture range, or working to a lignosulphonate-based integral waterproofing specification under IS 2645, might choose Conplast WL as a like-for-like alternative to WP+200.
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