Stamped concrete is the bulk of what we pour. Patterns, colors and borders you actually want, poured on a base and a joint layout that keep the surface flat and the color right in year ten.
A stamped patio is two jobs happening at once. One of them is the part you shop for: the pattern, the color, the border, how the whole thing sits against the house and the yard. The other is the part nobody photographs, which is the subgrade, the aggregate base, the thickness of the slab, where the joints land and what goes on top of it before the season is out. Homeowners choose a patio on the first job. They live with the second one.
We build both sides of it. Minnesota Valley Concrete has been pouring decorative flatwork in the southwest Twin Cities metro for fifteen-plus years, and stamped patios are a large part of what we do between March and mid-October. We pour out of Carver, and most of our patios go in within an easy drive of the shop.
The reason we push so hard on the boring half is simple. A patio is an outdoor room. It gets furniture, a grill, a fire feature and six months a year of people standing on it, and then it sits out under the weather for the other six. Get the base, the mix, the joints and the sealer right and a stamped patio is a durable, low maintenance outdoor surface. Get them wrong and the prettiest pattern in the catalog will not save it.
Water is the whole story, and it works on a slab from two directions. Concrete looks solid but it holds a small amount of water in tiny pores, and so does the ground underneath it. Ground that holds water moves in the cold, and not because that water simply swells. As the frost line works down through a silty soil it pulls more water up to the freezing front by capillary action, and that water freezes there in flat layers, so the ground itself grows. It never grows evenly, because soil and moisture are never even across a yard, and a slab sitting on ground that lifts under one corner and not another is a slab that will crack somewhere its owner can see. That is why we spend more of the quote conversation on what goes under a patio than on what goes on top of it.
Two things do most of the protecting. The first is an air entrained mix, which is concrete with microscopic air bubbles built into it on purpose. Those bubbles give freezing water somewhere to expand into instead of pushing the surface apart. Exterior flatwork in this climate should never be poured without it, and it is one of the things we spell out on a quote so you know what is going in the forms.
The second is drainage, above and below. Above means the patio is pitched so water runs off instead of standing in a low spot. We pitch away from the house, about a quarter inch of fall for every foot of run, which is enough to shed water and not enough to feel underfoot. Below means a compacted aggregate base that drains instead of a soft clay subgrade that holds water like a sponge. The failed stamped work we get called out to look at has usually failed underneath first, and the pattern on top had nothing to do with it.
Topsoil, sod and anything organic comes out. We bring the subgrade to grade, then build a compacted aggregate base in lifts rather than dumping it in one pass, because a base only compacts properly a few inches at a time.
Exterior flatwork here gets an air entrained mix. We size the order and the mix to what the slab is doing, and pour stamped patios four inches thick.
Every patio gets rebar, laid out on a grid roughly two to three feet apart and held up in the slab rather than lying in the dirt. Rebar does not stop concrete from cracking. It holds the crack tight when one happens, and keeps the slab working as one piece across it.
Color is premixed into the concrete before it is poured, so the slab is one solid color all the way through instead of a coating on the surface. The pattern and the border get picked with you on site.
Joints are planned before we pour, not after. Panels stay roughly square, and joints get cut deep enough and soon enough to actually control the slab. On stamped work we hide them in the grout lines of the pattern wherever the layout allows, so the patio reads as one surface rather than a grid of panels with a pattern printed on it.
The slab cures before anything goes on it. Then a sealer suited to a stamped surface, with a non slip additive so a wet patio is not slick underfoot. We tell you when to reseal and what to keep off it.
We come out, look at the grade, the access, where water runs today and where the doors and steps land. You get a quote with the size, the thickness, the pattern, the color and the sealer written down, not a number on the back of a card.
The shape gets laid out on the ground so you can see it before anything is dug. Then we strip organics, cut to depth and haul the spoil out.
Aggregate base goes in and gets compacted in lifts. Forms are set to the finished grade and the pitch, then rebar is tied on its grid and held up in the slab rather than lying in the dirt.
Pour day is a crew day. The slab is placed, floated and stamped in one window while the concrete is workable, which is why stamped work needs enough hands on site to keep moving. Edges, borders and steps get detailed by hand.
Joints are cut on time. The slab cures, gets washed, and then gets sealed. We walk the finished patio with you and go over how to take care of it through the first year.
Sealer is maintenance, not a one time item. A stamped patio is sealed to protect the color and slow water absorption, and that sealer wears under sun, foot traffic and cleaning. Plan on resealing it periodically, and ask us when you are looking at it, because a patio under a deck in the shade and a patio in full afternoon sun do not wear at the same rate.
Day to day, a stamped patio asks for very little. Sweep it, rinse it, move the planters and the furniture feet around now and then rather than leaving them in one spot for years, and get the leaves off it in the fall before they sit and stain the color. Everything else is the sealer doing its job.
The one thing worth being firm about is what you put on it and what you scrape it with. Keep de-icing salt off a stamped patio, and especially off a new one, because chlorides drive into the top layer of young concrete and pop the surface off in flakes, which is called scaling. Sand gives you traction and does not attack the slab. A plastic or rubber edged shovel keeps the texture on the pattern intact, where a metal blade takes the high spots off it a little at a time.
Our pour season runs March to mid-October. That is not a preference, it is what the ground and the air allow. Stamping needs concrete that stays workable long enough to place, float and stamp the whole field, and it needs ground that is not frozen. Early spring also brings seasonal road restrictions, so ready mix is limited on posted routes while the frost comes out, which can push the first pours of the year later than anybody wants.
The practical result is that the good weeks fill up. Homeowners who call in January and February about a patio for that summer get their pick of dates. Homeowners who call in June are picking from what is left. If you already know you want a patio next year, the winter is the right time to have the conversation, get the quote and hold a spot.
We pour patios across the southwest Twin Cities metro, out of Carver. Thirty towns have their own page on this site, and if yours is not one of them the answer is usually still yes. Call with the address and we will tell you.
It depends on square footage, the pattern and color package, how much excavation and haul out the yard needs, and whether steps, borders or a fire feature are part of it. We quote every patio after seeing the site, and the quote spells out thickness, mix, pattern and sealer so you can compare it against anyone else's.
Concrete moves, so hairline cracking is possible on any slab. What we control is where it goes and how tight it stays. A compacted base, the right thickness, reinforcement and joints cut on time and in the right places send cracking into the joints where you do not see it, instead of across the middle of the field.
It can be if it is sealed and nothing else is done about it, which is why we add a non slip additive to the sealer on stamped patios. Texture in the pattern helps too. A deep stamped pattern with an additive in the sealer holds up fine wet, and that combination is what we default to.
A stamped patio is one continuous slab with a pattern pressed into it, so there are no joints for weeds and ants and nothing to settle unevenly over time. Pavers are individual units on a sand setting bed, and they can be lifted and reset. In this climate a properly built slab needs far less attention year to year, which is why most of our patio work is stamped.
Sometimes, with an overlay, but we are cautious about it. An overlay is only as good as the slab under it, so if the existing patio is cracked, heaved, scaling or sitting on a bad base, resurfacing it just hides the problem for a season or two. We look at the existing slab first and tell you whether it is worth overlaying or whether tear out and repour is the better spend.
For a patio you want next summer, call over the winter. Our pour season is March to mid-October, and the calendar for the good stretch of it fills in through late winter and spring. Calling early costs nothing and gets you a real date instead of a maybe.
How soon you can walk on it depends on the pour, and we tell you on pour day. Furniture, grills and anything heavy wait longer, and we tell you the specific timing for your job on pour day since weather and mix both affect it. Sealing happens after the slab has cured, not immediately.
New driveways and full tear out and replacement. Proper base, proper thickness, joints cut where they belong, so it does not crack the way the last one did.
Learn moreWalks, front steps, stoops and garage aprons. The small pours people put off, done with the same base work and jointing as the big ones.
Learn moreBackyards, basements and anywhere the truck cannot back up to. Line pumping so the pour reaches the form instead of the wheelbarrow.
Learn moreTell us what you are planning, a patio, a driveway, a foundation or a pour you cannot reach. We will look at the site, explain what it actually needs, and give you a free written estimate.