Concrete letters turn a name, a house number or a favorite word into garden decor that lasts for years. The trick is using the cardboard letters sold at craft stores as ready-made molds. Travis DeRose made the Finnish word SISU, meaning grit and resilience, as a gift for his parents' front yard. He shares what went wrong on his first batch too, which saves you from making the same mistakes.
How to make concrete letters: the short version
- Cut one face off each cardboard letter to make an open mold.
- Mix concrete to the bag directions with a strong stick or shovel.
- Fill the molds, tap out air and smooth the top.
- Cure for at least 48 hours, then peel off the cardboard.
Choosing the cardboard letters
Papier mache letters from Michaels, Hobby Lobby or online make the job easy. Bigger is more forgiving, since thin strokes crack. Letters 8 to 12 inches tall and at least 1.5 inches deep give solid pieces about an inch thick. Block fonts work better than script or thin serif styles.
Picking a word and planning the batch
Short words read best from the street: a family name, a house number, LOVE, HOME or a word that means something to you. Line the empty molds up on the floor first to check spacing. A 60 pound bag fills roughly four 12 inch letters, so buy an extra bag for longer words and pour in two rounds if needed.
Which concrete mix to use
Travis used Quikrete 5000, a standard mix with gravel in it. It is strong but leaves a rough, pitted surface. For smoother letters, pick a sand mix or a countertop mix with fine aggregate. Mix only what you can pour in about 20 minutes. Once it starts to stiffen, the fine sand settles and you end up with a lumpy, gravelly top.
Safety with dry concrete
Concrete mix is caustic and dusty. Wear gloves and a dust mask when you pour the dry mix, and work outside or in an open garage. Rinse wet concrete off your skin right away. Keep kids and pets back while you mix and pour.
Ways to display them
- Lay them flat in gravel or bark like stepping stones.
- Lean them against a wall or along a fence line.
- Glue coupling nuts in before pouring, then thread in a bolt to stake them in the lawn.
- Seal them with a clear concrete sealer so moss and stains wash off.
Common problems
- Rough, pitted face. Tap the mold for longer to release air, or use a finer mix.
- Cracked thin strokes. Add a strip of mesh or a length of wire inside thin parts.
- Cardboard stuck fast. Wait longer. After a week the cardboard dries out and peels away cleanly.
- Paint stick snapped. Concrete is heavy. Use a margin trowel or a small shovel to mix.
More concrete crafts
For numerals, see concrete house numbers. Learn how to make concrete molds from household items, then try concrete bookends or a concrete planter to go with your letters.