How to Make Concrete Letters for Garden Decor

The finished result: How to Make Concrete Letters for Garden Decor
  • Difficulty: Easy
  • About 1 hour, plus 48 hours to dry or set
  • 9 steps

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How to Make Concrete Letters for Garden Decor

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Steps written out by Crafting Step by Step from Travis DeRose's video (opens YouTube) (8:01). Published .

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.

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Quick answer

How to make concrete letters with cardboard craft letters as molds. An easy project: about 1 hour, plus 48 hours to dry or set. Materials cost about $20 to $40. You need 12 things, including cardboard papier mache letters, concrete mix or sand mix and water. The 9 steps start with gather Cardboard Letters and Concrete Mix for Concrete Letters, cut the Top Off Each Cardboard Letter to Make a Mold and hot Glue Coupling Nuts Inside the Letter Molds (Optional).

Step-by-step guide

9 steps, about 8 minutes. Tap a picture to jump to that step. Your progress saves automatically.

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  1. Step 1: Gather Cardboard Letters and Concrete Mix for Concrete Letters

    Watch this step · 0:12

    Pick up cardboard papier mache letters for your word. Craft stores carry them, and online shops have the larger sizes. You also need a bag of concrete mix, a bucket for mixing, a strong stirring tool, a craft knife and newspaper to protect the floor. Coupling nuts and a glue gun are optional if you want to stake the letters into the ground later.

    Tip:

    Buy one spare letter. It is good for a test pour.

    Back to all steps

  2. Step 2: Cut the Top Off Each Cardboard Letter to Make a Mold

    Watch this step · 1:04

    Use a craft knife to cut around the edge of one flat face of each letter, then peel that face away. What is left is an open tray shaped like the letter. Decide now which side will be the front. The side that faces down inside the mold comes out smoother, so many makers cut off the back and use the bottom as the face.

    Tip:

    Cut a little inside the edge so the side walls stay firm.

    Back to all steps

  3. Step 3: Hot Glue Coupling Nuts Inside the Letter Molds (Optional)

    Watch this step · 1:50

    If you want to stand the concrete letters up in the lawn, hot glue a threaded coupling nut to the inside edge of each mold. The nut sets into the concrete. Later you can screw a bolt or threaded rod into it and push it into the ground like a stake. Travis did not end up using his, but it keeps your display options open.

    Tip:

    Tape over the open end of each nut so no concrete gets in the threads.

    Back to all steps

  4. Step 4: Mix the Concrete in a Bucket

    Watch this step · 2:10

    Lay the open molds flat on newspaper. Put on gloves, pour the dry mix into a bucket and add water a little at a time, following the bag directions. Mix with a sturdy trowel or small shovel. A wooden paint stick is not strong enough, and the delay let Travis's first batch start setting before he poured.

    Tip:

    Aim for thick oatmeal. Too wet and the letters weaken. Too dry and they crumble.

    Back to all steps

  5. Step 5: Scoop Concrete Into the Cardboard Letter Molds

    Watch this step · 2:40

    Spoon the wet concrete into each letter mold with a trowel. Push it into every corner and along the thin strokes. Fill each mold right to the top edge. Work quickly so the whole batch goes in before it starts to stiffen in the bucket. Move from letter to letter rather than perfecting one at a time.

    Tip:

    Keep a damp rag nearby to wipe spills off the outside of the molds.

    Back to all steps

  6. Step 6: Press and Smooth the Concrete in Each Letter

    Watch this step · 3:06

    Press the concrete down firmly with the trowel, then gently tap or jiggle each mold to bring air bubbles to the surface. Smooth the top as flat as you can. Whatever you see now is how the finished letter looks if this side faces up, so take your time here. Scrape off any extra from the edges.

    Tip:

    Tap the floor around the mold with a rubber mallet to settle the mix.

    Back to all steps

  7. Step 7: Peel the Cardboard Mold Off the Cured Concrete Letters

    Watch this step · 3:42

    Let the concrete cure for at least 48 hours. Waiting a full week is even better, because the cardboard dries out and lets go more easily. Then peel the cardboard sides away, working slowly around each letter. If you are careful, the molds can survive for a second pour. These letters came out about an inch thick and solid.

    Tip:

    Keep the letters out of hard sun and mist them with water while they cure.

    Back to all steps

  8. Step 8: Make a Second Batch for Smoother Concrete Letters

    Watch this step · 4:58

    Travis's first set came out rough because the mix had started to set. He mixed a second batch the right way, poured it straight away and got a much smoother finish. Once cured, he tore the worn cardboard off rather than saving it. For an even finer face, try a sand mix or countertop mix with smaller stones.

    Tip:

    Sand rough edges with a rubbing stone or coarse sandpaper once fully cured.

    Back to all steps

  9. Step 9: Set the Finished Concrete Letters in the Garden

    Watch this step · 5:56

    Choose where your letters will live. Here they are pressed into red landscape rock like stepping stones, spelling SISU along the front yard. You can also lean them against a wall or stake them into grass with the coupling nuts. Nestle each letter in so it sits level and does not rock when bumped.

    Tip:

    A coat of clear concrete sealer keeps them looking fresh outdoors.

    Back to all steps

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How to Make Concrete Letters for Garden Decor

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