What Is a Backer Rod Insertion Tool (BRIT) — And Why Every Pro Should Be Using One 

When it comes to getting a long-lasting, high-performance seal, most of the success happens before the caulk ever hits the joint. That’s where backer rod—and the right tools to install it—makes all the difference. If you’ve ever dealt with joints that crack, fail, or soak up way more sealant than they should, a Backer Rod Insertion Tool (BRIT) is about to become your new best friend. 

What Does a Backer Rod Insertion Tool Do? 

A Backer Rod Insertion Tool is designed to quickly and cleanly seat backer rod into gaps, cracks, and joints before sealant is applied. Backer rod acts as “space fillers” that help set the stage for a proper seal—and using a BRIT ensures they’re installed at a consistent depth for maximum performance. 

Here’s what backer rod helps you achieve: 

1. Fill Large Gaps Efficiently 

Backer rod acts as a stable base, so your sealant doesn’t just sink into a deep void. 

2. Control Sealant Depth 

Uniform depth = better performance. A consistent sealant thickness keeps the joint flexible and strong. 

3. Improve Sealant Bonding 

By shaping the joint into the ideal hourglass profile, backer rod helps your sealant bond at the edges and flex in the middle—right where movement happens. 

4. Reduce Sealant Usage 

Studies show you can cut sealant consumption by up to 50%. Less product, less waste, and cleaner applications. 

5. Maintain Movement & Prevent Cracks 

Backer rod allows the sealant to expand and contract without tearing away from the joint. 

Beyond construction joints, they’re also commonly used to fill cracks in pavement, gaps in sliding doors or windows, voids in cabinetry, and more. 

Meet the Newborn KIT-BRIT: The Pro’s Backer Rod Insertion Solution 

If you want the most consistent, professional installation, Newborn’s KIT-BRIT Backer Rod Insertion Tool is built for you. 

Why the KIT-BRIT Stands Out 

• Threaded swivel connection for a handle — allows smooth pushing motion even along long joints. 

• Includes 5 interchangeable skates so you’re prepared for virtually any gap size: 

• 3/32″ x 5/16″ 

• 1/4″ x 1/2″ 

• 1/2″ x 1/2″ 

• 3/4″ x 1/2″ 

• 1″ x 1/2″ 

Each skate keeps the backer rod pressed to a uniform depth along the entire joint—one of the biggest factors in sealant performance and longevity. 

https://newborncaulkguns.com/products/kit-brit/

How to Use the KIT-BRIT for Perfect Backer Rod Installation 

1. Clean the Joint 
   Remove dust, debris, and moisture. 

2. Measure the Gap 
   Pick the correct backer rod size (slightly larger than the joint width). 

3. Cut the Rod 
   Add 1–2 extra inches for a snug, secure fit. 

4. Insert with the KIT-BRIT 
   Choose the corresponding skate size, then press the backer rod into place at an even depth from start to finish. 

5. Apply Sealant 
   Fill the void above the rod completely. 

6. Tool the Bead 
   Smooth the sealant for a clean, durable finish. 

Pro Tips 

• Measure twice, cut once — once you trim foam, you can’t put it back. 

• Leaving room above the rod — sealant needs space to bond properly. 

• Always tool the bead — a smooth surface not only looks better, it seals better. 

After the Backer Rod Comes the Caulk Gun — Here’s What We Recommend 

Most pros switch to a bulk gun after placing their backer rod. Bulk guns give better control, hold more material, and eliminate the waste of cartridges. 

At Newborn, two steel bulk guns are the top choice for this step: 

Newborn 224 — 24 oz Steel Bulk Gun 

Newborn 232 — 32 oz Steel Bulk Gun 

• Both feature a 7:1 thrust ratio for smooth, controlled dispensing. 

• Both come factory-set for bulk application—no adjustments needed. 

• The only difference is capacity: 24 oz vs. 32 oz. 

If you’re doing long joints or wide gaps, the 32 oz keeps you going without stopping. If you want something lighter and easier to handle, the 24 oz is perfect. 

https://newborncaulkguns.com/products/224/

https://newborncaulkguns.com/products/232/

Wrap-Up: Better Prep = Better Seals 

Using a backer rod isn’t optional if you want a seal that lasts—and using a Backer Rod Insertion Tool makes the job faster, cleaner, and more consistent. 

The Newborn KIT-BRIT gives you precision and speed with its interchangeable skates and uniform-depth design. Pair it with a reliable Newborn 224 or 232 bulk gun, and you’ve got the ultimate setup for professional-grade joint sealing.