What’s happening under your house could be affecting your airflow
Most people never see their ductwork — but that doesn’t mean it’s installed properly.
The problem: incorrect ductwork installation under the floor
In this case, the subfloor ductwork was not installed correctly.
Ducting should be properly joined, supported, and hung from floor joists to maintain airflow and meet compliance standards.
When it isn’t, it can sag, collapse, or restrict airflow, impacting how your heating and cooling system performs.
What we found during inspection
Limited subfloor access with very tight working space
Ducts connected but not joined properly
Ducting not hung from floor joists
Sections of ducting collapsed and delaminated
Incorrect installation restricting airflow
The solution: rehang and correct the ducting properly
Replacing and rehanging the ductwork in a compliant manner.
Removed existing supply outlet ducts and connections
Replaced all ducting to suit the existing layout
Installed R1.0 rated ducting to AS 4254 standards
Rehung ducting correctly from floor joists
Removed and disposed of old ducting and materials
Provided compliance certification
Why this matters
Restores proper airflow
When ducting is installed and supported correctly, air can move through the system as intended — without restriction.
Prevents ongoing issues
Poorly installed ductwork can lead to long-term performance problems and inefficiencies.
Ensures compliance
Correct installation meets required standards and avoids issues associated with non-compliant work.
Done properly, it makes all the difference
This job was completed for a very happy customer, with the ductwork now installed correctly and performing as it should.
If you’ve never checked your subfloor, there’s a chance issues could be hidden out of sight.
Get in touch with Duct Doctor to have your system inspected and set up properly on 1300 846 688