How much does Waterproofing cost in 2024?

Do you have a leaking roof that requires waterproofing? The average cost of waterproofing can vary, from R140 to R500 per square metre.

 Let’s look at:

  • The average cost of waterproofing
  • Different types of waterproofing and their cost
  • Factors that influence the cost of waterproofing
  • How to select the right company for your waterproofing project

Cost of different waterproofing options.

Waterproofing costs can vary significantly based on the type of system and the extent of the work needed. Here’s a general overview of the costs and a brief explanation of each service:

‘Torch On’ Bitumen Membranes

  • Cost: R300 – R400 per square metre.
  • Description: This system involves applying a bitumen-based membrane using a torch to heat and adhere it to the roof surface. It is highly durable and suitable for extreme weather conditions.
  • When to Use: Ideal for flat or low-slope roofs where long-term durability and resistance to harsh weather conditions are required. Commonly used on commercial buildings and residential flat roofs.

Liquid Applied Waterproofing Coating

  • Cost: R140 – R400 per square metre.
  • Description: This waterproofing method involves applying a liquid coating that forms a seamless, monolithic membrane. It can be applied using brushes, rollers, or spray systems.
  • When to Use: Suitable for a variety of roof types, including flat and pitched roofs. It is especially useful for complex roof structures with many penetrations and details, such as skylights and vents.

‘Cool Roof’ Liquid Applied Waterproofing

  • Cost: R180 – R500 per square metre.
  • Description: This is a liquid-applied waterproofing system with added “cool roof” technology, which reflects or dissipates the sun’s rays, reducing roof temperature and thermal movement.
  • When to Use: Best for roofs in hot climates where reducing internal building temperatures and energy costs is a priority. It is also beneficial for roofs with significant sun exposure and those experiencing thermal expansion and contraction.

Single Ply Roof Membranes

  • Cost: R280 – R350 per square metre.
  • Description: These are synthetic roofing membranes installed in a single layer. They are mechanically fixed or adhered to the roof substrate, providing a durable and weather-resistant barrier.
  • When to Use: Suitable for both new roofs and the refurbishment of existing roofs. Ideal for commercial and industrial buildings due to their durability, ease of installation, and minimal maintenance requirements.

Each system has its advantages and is suited to different roof types and environmental conditions. For personalised advice and a precise estimate, consider reaching out to a trusted GP Roofing partner.

Pricing and Feature Table for Waterproofing 

Waterproofing OptionPricing (per m²,)ProsConsUse CasesWarranty Period
‘Torch On’ Bitumen MembranesR300 – R400– Highly durable Resistant to extreme weather- Good elasticity– Requires skilled application- Regular maintenance needed– Flat or low-slope roofs- Commercial buildings- Residential flat roofs8 – 10 years
Liquid Applied Waterproofing CoatingR140 – R400– Seamless application- Flexible and adaptable- Fast drying– Requires periodic re-coating- Not suitable for all roof types– Complex roof structures- Roofs with many penetrations- Residential and commercial roofs5 – 10 years
‘Cool Roof’ Liquid Applied WaterproofingR180 – R500– Reduces roof temperature- Lowers energy costs- Reduces thermal movement– Higher initial cost- Requires periodic re-coating– Roofs in hot climates- Roofs with significant sun exposure- Buildings requiring energy efficiency5 – 10 years
Single Ply Roof MembranesR280 – R350– Quick to install- Durable- Minimal maintenance– Can be more expensive initially- Requires professional installation– New roofs- Refurbishment of existing roofs- Commercial and industrial buildings15 – 20 year

Factors That Influence the Cost of Waterproofing

Understanding the factors that influence the cost of waterproofing can help you make an informed decision and budget effectively for your project. Here are the key factors to consider:

Type of Roof

The material and design of your roof play a crucial role in determining the cost. Different roofing materials require specific waterproofing systems, and some may be more expensive than others. For example, a flat concrete roof might need a different waterproofing approach compared to a pitched metal roof.

Size and Complexity

The size and complexity of your roof directly impact the cost of waterproofing. Larger roofs require more materials and labour, while roofs with complex designs, multiple levels, or intricate architectural features will need more time and expertise, increasing the overall expense.

Extent of Damage

If your roof has extensive damage or existing waterproofing failures, the cost will be higher. Repairing significant damage, removing old materials, and preparing the surface for a new waterproofing system all add to the total cost.

Accessibility

Roofs that are difficult to access can incur additional costs for specialised equipment and increased labour. For instance, a roof on a high-rise building or one with limited access points may require scaffolding, lifts, or other equipment, which adds to the cost.

Additional Features

Features like skylights, vents, chimneys, and other roof penetrations complicate waterproofing efforts. Each additional feature requires special attention and sealing, which can increase the cost of the project.

Save Money by Selecting the Right Company for Your Waterproofing Project

Choosing the right company for your waterproofing project is essential to ensure quality work and save money in the long run. Here’s how you can make the best choice:

Research and Compare

  • Get Multiple Quotes: Obtain at least three quotes from different companies to compare prices and services. This helps you understand the market rate and avoid overpaying.
  • Check Credentials: Ensure the companies are licensed, insured, and have good reputations. Look for memberships in industry trade associations as a sign of credibility and professionalism.

Read Reviews and Ask for References

  • Online Reviews: Check reviews on platforms like Google, Yelp, or local business directories to see what previous customers say about their experiences.
  • References: Ask the company for references and follow up with past clients to inquire about their satisfaction with the work and any issues they encountered.

Evaluate Experience and Expertise

  • Specialisation: Choose a company that specialises in waterproofing and has extensive experience with the type of system you need.
  • Portfolio: Ask to see examples of previous projects similar to yours. This gives you an idea of their capabilities and quality of work.

Assess the Scope of Work

  • Detailed Proposals: Ensure each quote includes a detailed breakdown of the work to be done, materials to be used, and the timeline for completion.
  • Warranty and Guarantees: Look for companies that offer warranties on both materials and workmanship. A good warranty indicates confidence in their work and provides peace of mind.

Consider Communication and Professionalism

  • Responsiveness: Choose a company that communicates clearly and promptly. Good communication is crucial for a smooth project.
  • Professionalism: Evaluate their professionalism during the quoting process. Are they punctual, respectful, and willing to answer all your questions?

Avoid Low Bids

  • Beware of Too-Good-to-Be-True Prices: Extremely low bids can be tempting but may indicate substandard materials or poor workmanship. Opt for a company that offers a fair price for quality work.

Trust GP Roofing Partners

  • Pre-Vetted Contractors: Selecting a GP Roofing partner in your area makes choosing the right contractor easy. GP Roofing has pre-vetted contractors, ensuring you work with reputable, qualified, and experienced professionals.
  • Quality Assurance: GP Roofing partners meet high standards, providing you with quality assurance and peace of mind that your waterproofing project is in good hands.

For expert advice and a detailed quote, contact GP Roofing today. Our vetted professionals are ready to help you with the best roofing solutions available.

Service Areas

  • GP Roofing – Damp Proofing and Waterproofing – George

  • GP Roofing – Damp Proofing and Waterproofing – Witbank

  • GP Roofing – Damp Proofing and Waterproofing – Stellenbosh

  • GP Roofing – Damp Proofing and Waterproofing – Vaal Triangle

  • GP Roofing – Damp Proofing and Waterproofing – Randburg

  • GP Roofing – Damp Proofing and Waterproofing – Richards Bay Empangeni

  • GP Roofing – Damp Proofing and Waterproofing – Roodepoort

  • GP Roofing – Damp Proofing and Waterproofing – Sandton

  • GP Roofing – Damp Proofing and Waterproofing – Pretoria

  • GP Roofing – Damp Proofing and Waterproofing – Port Elizabeth

  • GP Roofing – Damp Proofing and Waterproofing – Krugersdorp

  • GP Roofing – Damp Proofing and Waterproofing – Midrand

  • GP Roofing – Damp Proofing and Waterproofing – Fourways

  • GP Roofing – Damp Proofing and Waterproofing – Germiston

  • GP Roofing – Damp Proofing and Waterproofing – Johannesburg

  • GP Roofing – Damp Proofing and Waterproofing – Kempton Park

  • GP Roofing – Damp Proofing and Waterproofing – Centurion

  • GP Roofing – Damp Proofing and Waterproofing – Strand, Somerset West

  • GP Roofing – Damp Proofing and Waterproofing – East London

  • GP Roofing – Damp Proofing and Waterproofing – East Rand

  • GP Roofing – Damp Proofing and Waterproofing – Durban

  • GP Roofing – Damp Proofing and Waterproofing – Boksburg

  • GP Roofing – Damp Proofing and Waterproofing – Brakpan to Springs

  • GP Roofing – Damp Proofing and Waterproofing – Cape Town

  • GP Roofing – Damp Proofing and Waterproofing – Bloemfontein

  • GP Roofing – Damp Proofing and Waterproofing – Blouburg

  • GP Roofing – Damp Proofing and Waterproofing – Durbanville, Belville

  • GP Roofing – Damp Proofing and Waterproofing – Benoni

  • GP Roofing – Damp Proofing and Waterproofing – Alberton