How To Heat Weld Flash Cove

How to heat weld flash cove

Heat welding flash cove is among the hardest skills to master in floor heat welding. A solid foundation in flash coving will make you more valuable in your area. Knowing how to heat weld vinyl flash cove is necessary when heat welding on vinyl, under toe kicks and cabinets. Today we’re going to share a step-by-step guide on heat welding vinyl flash coving.


Once you have already laid the sheet vinyl with a narrow gap in the seam – approximately 1/64th of an inch – it’s time to groove out the seam. We recommend using the Turbo Cove Groover.

Tool talk: Most groovers are built for straight paths – making them a real challenge to use in these types of situations. The Turbo Cove Groover was built specifically with a guiding fin to prevent you from jumping out of the seam and gauging the material on flash coving.


Tip: Grooving flash coving is easier if you lightly pre-heat the flooring material with your heat welding gun before you start grooving. •

   Step 1: Groove the flash cove curve, either direction is fine

Grooving the curve
Groove up the curve
Groove down the curve

Grooving up flash cove







   Step 2: Groove upward, vertically, along the seam with both hands on the cove groover for stability





Groove flash coving

   Step 3: Groove down the seam continuing for about 3 inches along the flat portion of the seam




Heat Welding – The L-Welding System

The Turbo L-Welding System is powered by the Detail Nozzle attached to the L-Welding adapter on a Leister Hot Jet S.

Leister Hot Jet S
Lightweight Leister Hot Jet S

Although the Leister Triac is a great heat welding gun for straight seams, its size can make heat welding vertical seams very challenging or impossible. For heat welding flash coving – we strongly recommend using the Leister Hot Jet S. The Leister Hot Jet S provides the power needed for the job while being light and small enough to not compromise your visibility or get too heavy.



L-Wedling Adaptor
L-Welding Adapter

The Adapter L Pencil Tip gives you an easier, more comfortable angle while welding vertically.





Welding tip for flash coving
Detail Nozzle

Finally, the Detail Nozzle was designed for these type of difficult seams – allowing you to heat weld vertically without scorching the material. The Detail Nozzle is aptly named as it was created specifically for “detail” work – flash cove areas, toe kicks, corners, vertical heat welding, etc. This patented technology ensures that you avoid scorching the material while heat welding. It was created with the “field knowledge” that visibility is low and space is limited.


The combination of these three components constitutes the L-Welding system. This will make heat welding flash coving easier than ever.

Heat Welding

welding flash coveStep 1: Pre-heat your gun for about 10 minutes between 5 and 6 before you start. Cut the welding rod diagonally (this will help you reach the top of the seam) and preheat the top of the seam for approximately 4 seconds with your detail nozzle.





How to heat weld flash covingstrong>Step 2: Start welding at the top of the seam. Push the welding rod in place and under the metal capping.





Heat weld flash coveStep 3: Weld down the flash cove at a steady pace using a little pressure to weld the rod into the groove.





How to heat weld vinyl covingStep 4: When you get to the curve turn your wrist for a continuous uniform weld.






Heat weld under cabinetsStep 5: Continue welding for about 3-6 inches away from the wall to join with your straight seam.






Once you have heat welded your seams we recommend using either a curved quarter moon knife or an X-Acto blade to skive off the welding rod for a smooth finish.

Skive flash cove
Using a quarter moon knife

When skiving with your quarter moon knife start by skiving the rod in an upward direction and then alternate downward. Start at the curve and continue skiving until the seam becomes smooth.





Skiving under cabinets
Using an X-Acto blade

To skive off the welding rod using an X-Acto knife start at the curve and work your way up and down. Alternate your direction and keep shaving off the welding rod until the seam becomes smooth.





We hope this article serves as a guide you can refer to whenever you have questions about how to heat weld flash cove. If you have any more questions or comments, send us a message on The Floor Pro and we’ll be happy to respond.

If you would like to discuss this article, please join us in the Articles Discussion Forum. If you are not yet a member of The Floor Pro Community, we invite you to register now, it’s free and gives you the opportunity to enjoy all the features of the site.

This Post Has 7 Comments

  1. Lorrie Nelson-Smith

    I am a consumer. I have vinyl flooring that has 2 coved (outside) corners and was obviously NOT installed by a pro. Can I get some help (located in Kent WA) from a pro that can fix Home Depot’s work. The (poor) installation is not covered by a warranty by Home Depot. Help – I need someone who knows how to do this specialty work in repair.

    1. Jim McClain

      You will get a lot more help with this if you ask this on our Forums. Registration is always free.

  2. Leo

    Hey John & Jeff,
    I would love to help you out. Feel free to call us or email me. We can get all your questions answered.

    Leo Jr.

  3. jeff

    Would appreciate advice on heatwelding inside corners with hotjet s and best tip to use, what should my settings be at

  4. John Eckert

    I’d like some tips on welding outside corners.

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