How to Fix Kinking in the Ducts in Attic Vents

What You'll Need
Hand Gloves
Face Mask
Mastic Sealant
Long Turn Duct Elbows (Example: Dryer-Ell)
Wide Metal Duct Straps
Utility Knife
Foldable stair or Step Ladder

Attic vents play critical role in ensuring the efficient flow of air around the attic and the over-all temperature condition of the house. However, its efficiency will likely suffer when ducts start to have kinks that hamper the smooth flow of air. Sagging due to material expansion or improperly installed elbows form kinks over time. To correct these kinks, here is what you should do.

Step 1 – Get the Area Ready

Wear the necessary protective equipment such as hand gloves, face mask, and safety goggles. Get the materials and tools ready. When placing the step ladder, make sure it is resting on the floor and not prone to sliding. Utilize leveling jacks if available on your ladder. Once you’re on top of the ladder, use the rope to tie the topmost step onto the roof and secure it from tilting or moving.

Step 2 – Locate Kinks on Ducts

Get into the attic and check for sagging or angled ducts. These ducts ideally go in a straight line but curves in tight angle towards the vent. The kinks normally form along the curve when no appropriate elbow is provided. Check the support flex duct work and make sure that the metal straps are installed properly. The straps should be installed at an interval of about five feet so provide enough support to the duct.  If the straps do not provide enough support to the ducts, put additional straps then nail the straps securely to the nearest frame. Nailing the straps to the frame will help stabilize the ducts and prevent them from sagging.

Step 3 – Perform Repair Activity

To remove the kinks from the ducts, cut the section where the kinks are found. The length to remove should be equal to the length of the main body of the long elbow. Leave out enough length of the ducts to fit into the sleeve. The long elbow provides less resistance to air flow compared to the conventional elbow that has sections that hamper the smooth flow of air. If the kink is found midway through the vent, you may use wider elbow to get the air flowing smoothly.

After replacing the elbows, you need to seal the joints to make sure that the air does not escape through the leaks around the joints. To seal the joints, you may use duct sealer that can handle extreme temperature. To seal the tube, you need to squeeze the tube then apply a thick line of duct sealer around the inside of the larger duct opening. Slip the other section inside during the sealing activity. If a stretch of the duct assembly has obvious leaks, mastic can also be used to seal these. Apply sealer around corners and collars of the entire air or heating system including the plenum areas. Survey your work afterwards and make sure that the joints and leaks are securely sealed.

Step 4 – Finishing Up

Clean up the area carefully and remove all unnecessary materials near your attic vents.