Dimension Diagram — updates as you type
Plan view of the area to waterproof. Multiply by the layer count for total coverage.
1 Project Info
2 Area Dimensions
3 Surface & Method
4 Coverage & Layers
Roll Dimensions
5 Cost & Details
Results
Area
Material Needed
⚠️ Pre-Export Checklist
- Surface type confirmed (concrete/brick/wood/metal)
- Cracks and joints repaired before coating
- Layer count matches product datasheet
- Coverage rate checked for chosen method
- Dry weather window planned for application
- Primer included where the system requires it
Professional Waterproofing Estimation Guide
Show formulas, methods & pro tips ▼
Formulas
Total Area = Length × Width
Liquid Material= (Area × Layer Count) / Coverage Rate
Rolls Needed= Area / (Roll Width × Roll Length)
Total Cost= Material Cost + (Labour Rate × Area)
Method Comparison
| Method | Coverage | Best For | Durability |
|---|---|---|---|
| Liquid Membrane | 30-60 sqft/L | Roofs, balconies | 10-15 years |
| Sheet Membrane | Per roll | Foundations, flat roofs | 20-30 years |
| Cementitious | 20-40 sqft/kg | Tanks, basements | 15-20 years |
| Bituminous | Per roll/sheet | Below-grade, roofs | 20-25 years |
Pro Tips
- Surface must be clean, dry, and free of loose particles before application
- Apply primer coat for better adhesion on all methods
- Overlap sheet membranes by minimum 4 inches (100mm)
- For liquid membranes, apply in multiple thin coats rather than one thick coat
- Protect applied membrane from foot traffic and UV until fully cured
Waterproofing — 3D Preview
Drag to rotate — Scroll to zoom
Calculadoras Relacionadas
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
📖 Como Usar a Calculadora de Impermeabilização
Meça a área a impermeabilizar em metros quadrados.
Selecione o tipo de material.
Insira o número de demãos necessárias.
Insira o custo do material por unidade.
Clique em Calcular para obter a quantidade total.
Revise a detalhamento dos custos.
📐 Fórmula de Impermeabilização
⚠️ Erros Comuns de Impermeabilização
Não preparar adequadamente a superfície.
Aplicar em condições climáticas extremas.
Pular a camada de primer.
Usar espessura insuficiente do material.
Não estender a membrana além da linha d'água.
💡 Dicas Profissionais
Sempre aplique em superfícies limpas e secas.
Use um primer específico para o material.
Aplique camadas finas e uniformes.
Estenda a membrana pelo menos 300mm além da linha d'água.
Inspecione após cada camada.
Considere uma camada protetora.
Mantenha registros para fins de garantia.
❓ Perguntas Frequentes
Depende do material. Membranas líquidas duram 10 a 15 anos, revestimentos 5 a 10 anos, membranas betuminosas 15 a 25 anos.
A maioria dos materiais requer superfícies secas para aderência adequada.
Depende do material. A maioria das membranas líquidas requer 2 a 3 demãos.
🏗️ Aplicações Reais
Use nossa calculadora para estimar materiais e custos precisos para projetos de impermeabilização de porões, telhados, paredes e fundações.
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.