What is a Joint Seal Contractor or Sealant Applicator?

A Driveway Concretor is a specialist tradesperson who installs external concrete driveways, crossovers, footpaths, and sometimes adjoining pathways or hardstand areas. They focus on access and aesthetics — blending functionality with curb appeal.



They’re typically engaged late in the construction process, once the home is locked up and external levels are confirmed.

What does a Joint Seal Contractor or Sealant Applicator do?

Your contractor will complete works according to your agreed scope of works.


Typically, a Joint Seal Contractor will:

  • Inspect gaps and joints between materials (e.g. cladding, flashings, window frames)
  • Clean and prep surfaces to ensure good adhesion
  • Apply the correct sealant (silicone, polyurethane, or hybrid) based on material type
  • Smooth and finish joints to suit your project’s aesthetic and waterproofing needs
  • Coordinate with painters or renderers if sealing needs to be painted


They may also recommend joint backing rods or primers if the gap size or movement requires it.

Barry's Toolbox

Sealant isn’t just for looks — if it’s done poorly, you’ll get leaks and drafts. Ask your contractor if they’ve worked with your cladding or window system before.


And check if the sealant needs to be painted — some don’t take paint well and may need taping off or special finish work.

What to look for in a Joint Seal Contractor

When reviewing quotes, look for:

  • Proven experience with external building envelopes
  • Use of professional-grade sealants with warranties
  • Knowledge of compatible materials and finishes
  • Clear scope for all joints, penetrations, and trims
  • Attention to detail (the work is visible and weather-exposed)
  • If they also offer internal sealing (wet areas, skirting), it may be worth combining both in the same contract.

Before You Begin: What You’ll Need Ready

To get quotes from Joint Seal Contractors or Sealant Applicators, you’ll need:

  • A site plan and photos of external joints
  • Confirmation that cladding and window install is complete
  • Substrate types (e.g. render, metal, timber)
  • Preferred sealant type or colour (if specified)
  • Timeline for completion prior to painting or finishing

Average Timeframe

For this task, Pros typically provide quotes within 7-10 business days.

When Can I Expect Quotes?

Timeframes often vary based on demand and the type of Pro you're engaging (e.g. a plumber). If additional communication or clarification is needed is needed, the quoting process may take longer.

 

Don't be alarmed if you don't receive quotes or communication from any Build Buddy Pros straight away. Some work is more complex and the Pro may need time to comprehend your documents or scope of work. Depending on the job, there may even be some work required by the Pro before they are able to quote (e.g. a site visit might be required).

 

If the average timeframe indicated here has passed, and you have not received any messages or quotes, please feel free to contact the Build Buddy Expert Guidance and Support team for an update on quoting for this task.

Frequently Asked Questions

  • Do I really need joint sealing externally?

    Yes — even small gaps can let in water, wind, or pests. It’s a critical waterproofing and finishing step.

  • Will the sealant be visible?

    Yes — most sealant beads are visible at trims, corners, and junctions. A clean finish and colour match can make it less noticeable.

  • Can this be done before cladding is finished?

    No — sealing is one of the last external tasks. All fixed elements should be in place first.

How to Complete this Task?

STEP 1

Review and Adjust the Scope of Works

Timeframes may vary based on demand and the type of Pro you're engaging (e.g., a plumber). If additional communication or clarification is needed, the quoting process may take longer.

STEP 2

Confirm Required Documents Are Uploaded

Check that the following required document(s) are uploaded for this task. These are essential to proceed:

STEP 3

Update the Quality Assurance Checklist

Go to the Quality Assurance tab in this task and review the checklist. Edit any details to suit your project requirements. Being clear and upfront helps set expectations with the Pro. Updating the checklist before requesting quotes ensures everyone is aligned.

STEP 4

Request Quotes

Click the orange ‘Request Quotes’ button to start the quoting process.

STEP 5

Review the Quotes

Once you receive quotes:

  • Review each one carefully, including the payment schedule and any special terms
  • Download attached quote documents for detailed review
  • Check each Pro’s profile and read past client reviews

STEP 6

Communicate with the Pro

If needed, message or call the Pro to clarify details or negotiate terms.

STEP 7

Accept a Quote

Choose the quote that best suits your needs. Once you accept a quote, any other pending quotes will be automatically declined. An agreement will automatically be generated.

STEP 8

Complete the Tasks In Your App

New tasks will appear to guide you through this job — follow each step carefully. Make sure to use the Quality Assurance Checklist, and refer to your contract and final Scope of Works whenever needed.

NEED HELP?

Reach Out to Your Build Buddy Pro

If you have any questions or need a hand, your Build Buddy Pro is your best first contact. They’re a licensed expert in their field and can understand the ins and outs of your project. You can message them via the platform, or you can call them directly.


If you have already contacted your Build Buddy Pro and still need further assistance, the Build Buddy Expert Guidance and Support team are here to help. They will be able to guide you on your next steps or help you find answers to any questions you may have.