How to Make Fiber Optic Concrete: DIY Sidewalk Stars

Jan 2, 2016 | Outdoors

Fiber optic concrete was the plan from the start on this one. I wanted a real path out to my grill, not the goofy setup we had in the yard. A trip to Epcot got me thinking about light effects in concrete, so we decided to try fiber optics in a small sidewalk pour and see if we could make stars at night.

Concept shot that inspired the backyard fiber optic concrete star effect

Quick Answer

Yes, fiber optic concrete can work in a backyard project. Ours did light up like stars at night. It was messy, frustrating, and not all fibers survived the pour, but the result was still worth it.

This was not a polished commercial install. It was a backyard test using fiber strands, concrete, and one LED light source to see if the star effect would actually survive a real pour.

The goal was a glowing concrete walkway, not a showroom piece.

If you like weird DIY builds inspired by old park tech, you might also like this one: Rare Epcot Center Spaceman Light Switch Cover.

What We Used

Concrete forms and mix for a short sidewalk/pad
Fiber optic strands (we used a cheap bundle; this is the closest match on Amazon)
One LED light source at the fiber bundle base
Zip ties, snips, gloves, and a lot of patience

Build Process

1) Start with a real form, not junk

We originally had a sketchy diving-board walkway setup and scrapped it. Build proper forms first, then worry about fiber routing.

Old fiberglass diving board used as a temporary walkway before the concrete forms

Temporary backyard path area before the fiber optic concrete forms were finished

Wood form setup for the small sidewalk pad near the grill area

2) Lay fiber first, then pour and pull through

Our plan was to lay fibers, pour a thinner layer, and pull strands up through wet concrete in random points. In practice, concrete set faster than expected and fibers tangled immediately.

Fiber strands laid out in the form before concrete hit the board

Pre-pour setup showing fiber optic strands ready to be pulled through wet concrete

3) Manage fiber bundles while concrete hardens

As the concrete tightened up, fibers wanted to bunch together. Zip ties helped keep groups up and out while finishing. Also wear gloves; wet concrete plus fiber handling is rough on your hands.

Concrete being worked while fiber strands are pulled up through the mix

Fiber strand bundles tied together with zip ties to keep them above wet concrete

Close-up of grouped fiber strands held in place during the pour

4) Trowel carefully and trim after cure

Troweling around sticking fibers is tricky. We trimmed fibers higher during finishing, let the slab cure, then clipped flush after it dried.

Careful troweling around protruding fiber strands before final cure

What Went Wrong

The pour was thicker and faster-setting than planned.
Fibers tangled and some got trapped.
We definitely did not get all strands to light up.

If I did it again, I would use a slower, more controlled process for routing and separating fibers before the pour started moving too fast.

Even with those problems, the effect still came through.

Night Test and Final Result

Night photo showing visible light points in the finished fiber optic concrete sidewalk

It actually worked. Not Disney-level, but clearly visible star points in the sidewalk. For a first run where we were making it up as we went, I’ll take that as a win.

Daylight view of the finished fiber optic concrete slab after curing and trimming

Additional Photos

Additional angle of the completed concrete sidewalk slab in daylight

Close-up detail of fiber points visible across the finished slab surface

Side angle of the finished sidewalk near the deck and grill area

FAQ

Would I do fiber optic concrete again?

Yes, but with better prep and a cleaner method for keeping strands separated during the pour.

Does fiber optic concrete actually work?

Yes, it can work in a DIY project. Not every strand will survive or light perfectly, but you can absolutely get visible light points in the finished concrete.

Is this a beginner concrete project?

Not really. Plain concrete work is beginner-friendly. Adding fibers while finishing raises the difficulty quickly.