Waterproofing Services in Puerto Vallarta

Waterproofing Services in Puerto Vallarta

Puerto Vallarta receives an average of 1,800 mm of annual rainfall — almost entirely concentrated in the June through October rainy season. During peak rainy season, a single storm can drop 100–150 mm in 24 hours. For a flat-roof concrete building, every raindrop that falls on the property passes through the roof surface. If that surface is not properly waterproofed, it's not a question of whether water will infiltrate — it's a question of when and how much damage it causes before the leak is discovered.

Water infiltration is the primary cause of structural damage, mold growth, interior finish deterioration, and long-term rebar corrosion in Puerto Vallarta properties. PVR Contractors provides comprehensive waterproofing systems designed for this specific climate — high rainfall intensity, intense UV exposure, and significant thermal cycling between day and night, dry season and rainy season.

Waterproofing Systems by Application

Flat Roof Waterproofing — The Critical Priority

Virtually all Puerto Vallarta residential construction uses flat concrete roof slabs (losa plana). Without proper waterproofing, water infiltrates through hairline cracks in the concrete — caused by thermal expansion and contraction, seismic micro-movements, and structural deflection — and eventually appears as ceiling stains, mold, and plaster bubbling inside the property below.

We install several roof waterproofing systems depending on the specific situation:

• Polyurethane liquid membrane: Applied as a liquid that cures to a seamless, flexible, UV-resistant elastomeric membrane. Excellent for irregular surfaces and complex geometry with pipes, drains, and parapets. Typical thickness 1.5–2.5 mm, lasting 7–12 years in Puerto Vallarta conditions. Our top recommendation for most residential roofs.
• Bituminous modified membrane (SBS or APP): Torch-applied or cold-bonded bituminous sheets, 3–4 mm thick. Proven technology with 10–20 year life expectancy. Excellent for large flat areas where uniformity of application is easier to control than liquid systems. Protected with aluminum foil facing or granule coating for UV resistance.
• Elastomeric acrylic coating: A more economical option for sound existing surfaces needing a maintenance coat rather than a full replacement. 3–5 year re-application cycle — appropriate for ongoing maintenance programs.
• EPDM rubber membrane: Single-ply vulcanized rubber sheet — extremely durable (20+ year lifespan), flexible, and ideal for occupied buildings where torch application creates unacceptable fire risk or odor.

Terrace & Balcony Waterproofing

Tiled terraces present a specific challenge: the waterproofing membrane must be installed under the tile, invisible and inaccessible once tiling is complete, yet must perform reliably for the life of the tile installation. If the under-tile membrane fails, water reaches the structural slab below the terrace — often appearing as ceiling leaks in the room below, which may be 2–3 meters horizontally from the actual leak entry point because water travels along the slab before penetrating.

Our terrace waterproofing system: proper substrate preparation including crack repair and priming, two-coat cementitious waterproofing membrane (or liquid polyurethane membrane) applied over the structural slab before tile bedding, reinforced with fiberglass mesh at all corners and penetrations, then a drainage slope mortar bed before tile installation. This system is designed to last the full life of the tile installation — typically 20+ years with quality materials.

Bathroom & Wet Area Waterproofing

Shower pans and wet room floors are the most moisture-intensive interior applications. Inadequate shower waterproofing — the single most common construction defect we remediate in Puerto Vallarta properties — allows water to penetrate through tile and grout, saturating the structural slab, migrating laterally, and appearing as mold stains, floor bubbling, and ceiling damage in spaces below.

Our shower waterproofing system: cementitious waterproof coating or polymer sheet membrane applied over the shower floor and walls to minimum 1.8 m height, reinforced at floor-to-wall junction with waterproof fabric tape, integrated with the pre-sloped shower floor for drainage to the center drain. This system is flood-tested (filled with water for 24 hours) before tile installation to confirm zero leakage.

We strongly recommend this systematic approach over the common practice of simply applying a paint-on sealer — sheet and cementitious membranes provide reliable long-term protection; paint-on sealers provide minimal protection that degrades within 1–3 years.

Foundation & Below-Grade Waterproofing

Below-grade walls and slabs are in direct contact with soil moisture and, in lower areas of Puerto Vallarta near the bay and river, periodic groundwater. Without waterproofing, concrete below grade will eventually become saturated, leading to rebar corrosion (which causes destructive concrete spalling), mold growth, and interior dampness.

We use two primary below-grade systems:

• Crystalline waterproofing (Xypex, Kryton): A cementitious product containing active chemicals that react with water and unhydrated cement to grow crystals within the concrete pores — permanently blocking them. Crystalline waterproofing becomes a permanent part of the concrete and self-heals minor future cracks. Ideal for new construction cisterns, foundation walls, and retaining walls where it can be applied from the positive (wet) side.
• Bituminous membrane system: For foundation walls accessible from the exterior during construction — torch or cold-applied bituminous sheets provide a robust physical barrier against groundwater pressure. Combined with drainage board to protect the membrane during backfill and manage groundwater away from the structure.

See our foundation construction page for details on how we integrate waterproofing into new foundation work.

Swimming Pool Waterproofing

A concrete pool shell must be completely watertight — any leak wastes water, undermines surrounding soil, and affects pool chemistry balance. We apply cementitious waterproofing to the interior pool shell before marblite or tile finish, and polyurethane sealant at all equipment penetrations (return inlets, drain outlets, light niches). The surrounding pool deck also requires proper waterproofing, slope drainage, and expansion joint sealing to prevent water from migrating under the deck surface.

Parapet & Flashing Details

Parapets — the upstand walls at roof edges — are the most common source of roof leaks in Puerto Vallarta because they are the transitions between the roof membrane and the vertical wall, creating junction points that must accommodate both horizontal and vertical movement. We waterproof parapets with membrane turned up and onto the parapet face, metal or PVC drip edge at the parapet cap, and sealant at all penetrations and transitions. These details receive as much attention as the field of the roof — because that's where leaks happen.

The Surface Preparation Imperative

Waterproofing is only as effective as the surface it adheres to. A waterproof membrane applied over contaminated, cracked, or unsound substrate will delaminate under thermal cycling and hydrostatic pressure — failing exactly when it needs to perform most. Our preparation process:

1. Remove all existing failed waterproofing and contaminated material
2. Wire brush or grind to sound, clean concrete
3. Repair all cracks: structural cracks with epoxy injection, hairline cracks with flexible sealant
4. Fill all low spots and level transitions with repair mortar
5. Apply manufacturer-specified primer where required
6. Verify substrate moisture content is within application limits

This preparation work takes longer and costs more than skipping it. It is also the reason our waterproofing lasts while budget contractors' work fails in the first rainy season.

Waterproofing Costs in Puerto Vallarta

• Roof waterproofing (polyurethane, 2-coat system, per m²): $18–30 USD/m²
• Bituminous membrane roofing (torch-applied, per m²): $22–38 USD/m²
• Under-tile terrace membrane (per m²): $20–32 USD/m²
• Shower waterproofing (cementitious system, per shower): $350–700 USD
• Foundation crystalline waterproofing (per m² of wall): $15–25 USD/m²
• Expansion joint sealing (polyurethane, per linear meter): $12–22 USD/m

Emergency leak investigation and repair is available year-round. Contact us immediately when a leak appears — early intervention prevents far more expensive structural damage. Annual pre-rainy-season inspection (May–June) is strongly recommended for all Puerto Vallarta property owners.