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🧱 Seal the gap, secure your space — expansion done right!
The Reflectix EXPO4050 Series Expansion Joint is a 4-inch wide, 50-foot long waterproof foam designed for concrete control joints and wall surface repairs. Lightweight and easy to install, it offers durable protection and precise gap filling, trusted by professionals with a strong 4.4-star rating.
| ASIN | B004WAPFS6 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #101,878 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #305 in Wall Surface Repair Products |
| Brand | Reflectix |
| Brand Name | Reflectix |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (470) |
| Date First Available | January 1, 2008 |
| Global Trade Identification Number | 00716511560017 |
| Included Components | Appliance Parts & Accessories |
| Is Discontinued By Manufacturer | No |
| Item Form | Foam |
| Item Weight | 1.1 pounds |
| Item model number | EXPO4050 |
| Manufacturer | REFLECTIX INC |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Gap Fill | 50 Inches |
| Model Info | EXPO4050 |
| Number of Items | 1 |
| Part Number | EXPO4050 |
| Product Dimensions | 5.25 x 5.25 x 48.75 inches |
| Surface Recommendation | Walls |
| UPC | 716511560017 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |
D**E
Very good
It is easy to use. Work very well
W**S
Expansion foam for concrete control joints
Wonderful price for. Quality product
V**U
Great product but not perfect to refill current joint.
This works great and easy to work with. The only issue with using this to replace rotten joint is that the gap between the concrete pads are usually slightly wider. If this product is about 3/16" or 1/4" thick, it will be perfect. It is easier to squeeze it in instead of leaving a gap in between. I end up have to cut a thin strip and squeeze near the top of the concrete gap to complete fill and secure this foam. I little be more work but it works. Let' see if it hold up.
M**K
Great product.
I had an idea to use this stuff between stone edging and the lawn. Helps space the grass from the stone a bit, making it easier to cut and edge.
J**O
Easy for this DIY!
Easy to work with and does what it is supposed to do. You need to be careful as the 1/2 inch perforation along the top tears off easily.
C**O
Good price
Worked good easy to use
N**.
it works perfectly for basement slabs
Installed it with one of the jobs we did in a basement with a brand new slab. Works like a charm and easy to use
S**Y
Maybe I thought it was something else?
I have big gaps in my concrete driveway pads and the expansion joint material is long gone. I was looking to stick a bit of caulking foam, a pool noodle or something and caulk this on each side over the top. This is more like a foam material rather than that tarry caulk that I see in my other joints. I don't recall seeing the guys use tar or anything when doing the concrete work, so I thought this was the same stuff. It's probably more my fault for thinking it was something else, but for any lunkheads like me trying to not spend a ton on caulk tubes to fill a 4" x 20' gap, it's not really the right thing. So, the quest continues to fix my driveway.
Trustpilot
4 days ago
1 week ago