Slab foundation building in Merrimack NH - a solid base under your new home
Planning a house, addition or garage on a slab? We plan what goes under it first, so the concrete on top starts on solid ground.
- Licensed and insured.
- Free in-person estimates.
- We reply within 1 business day.
What goes into a slab foundation in Merrimack?
At Quality Merrimack Concrete, slab foundation building in Merrimack means we lay a bed of gravel and heavy plastic sheeting, then pour a concrete slab on top that serves as the foundation for your house, addition or garage.
Most people who call about a slab are planning a new building and want the bottom of it done right the first time. The price mostly comes down to the size of the slab, whether it's reinforced, how much digging and gravel your lot needs before we can pour, and extras like radon features. The schedule turns on the permit, the weather and what we find once the ground is open, because old fill or a wet spot can add work nobody planned for. The estimate I leave you on site puts your own number to all of that.
How do you know it's time to plan your slab foundation?
Plans with no basement
If your drawings show the building sitting right on the ground, the slab is the foundation, so what goes under it matters as much as the concrete itself. Leaving that planning until the excavator shows up is how a base ends up raked level instead of dug out and packed.
Water that sits after rain
A spot on the lot that stays puddled or soft for days usually means water collects there or sits close to the surface. Building over it without planning the drainage and gravel can leave you with a damp slab that's costly to fix once the house is on it.
An old slab that keeps cracking
Cracks that keep getting wider, or a corner that's dropped, usually mean the ground under the slab settled. Waiting lets water get in and freeze, and a slab that breaks into pieces costs more to tear out than one you replace sooner.
How we build a slab foundation
Before anything else, I plan what goes under the slab, because that's the part you'll never see again once it's poured. We dig out the soft topsoil down to firm ground rather than raking it level, pack the subgrade, which is the soil the whole slab rests on, and spread clean, coarse gravel so ground moisture and soil gas can move around underneath instead of pushing up into the house. Heavy plastic sheeting goes over the gravel to keep damp and gas out and to stop the wet concrete from filling the gravel, and while it's all still open I'll ask whether you want radon features built in, since that's when they're easy to add. Then we set rebar, the steel that holds the slab together if it cracks, pour early in the day so the top doesn't dry too fast in the heat, finish it and cut control joints, shallow grooves that give the slab a straight line to crack along instead of a random one. If the budget gets tight, I'd rather keep the money in the base and go plainer on top, because nobody sees the base on day one, but a nice surface over a weak one doesn't stay nice.
A slab is one way to put a building on the ground. If your plans call for a basement or poured walls instead, that's our foundation installation work, and if you're putting up a business building that needs parking beside it, we handle concrete parking lot building on the same kind of dug-out, packed base.
Reinforced slab for a house or addition
This is what a home or a heated addition gets, with steel set through the concrete so it holds together over the years. It's the right call anywhere people will live on top of it.
Plain pad for a shed or outbuilding
A pad without reinforcement costs a bit less per square foot and can suit a light building nobody lives in. If you're comparing quotes, ask which one each covers, because the two get mixed up.
Frost-protected shallow foundation
A builder's guide from 2004 describes this as a slab with insulation around the building to keep the ground under it warmer, most suitable for slab homes on gentle slopes and poured in one go. If your designer brings it up, we can talk through whether your lot fits.
Get a free on-site estimate for your slab foundation
Send the lot location, rough slab size and any fill you know of. We reply within one business day, then I come out and leave a free estimate on site with no obligation.
(603) 377-5028- Based in
- Merrimack, NH 03054
- Hours
- Mon–Fri: 8 AM–10 PM, Sat–Sun: 7 AM–9 PM
What happens after you call about a slab foundation?
Here's how a slab foundation job runs from your first call to the finished pour, and who you'll deal with along the way.
Call or send the form
Call (603) 377-5028 or use the form, and we'll set a time for me to come see the lot. Have your building plans handy if you've got them.
I walk the lot with you
I come out myself, look at the spot, ask how you'll use the building and want to hear about any fill or wet low ground. You get an estimate on site that spells out the digging, gravel, sheeting, steel and pour, so you know what you're paying for and can compare it line by line.
Permit paperwork, then ground prep
Once you say go, we get any permit paperwork moving with the office that handles your job. Then we dig out, pack the base and lay the gravel and sheeting, which is the stage I watch most closely.
Pour, finish and hand off
I'm on site with our crew for the pour and the finish. Before we leave, I walk you through how long to stay off it and what to watch for in the first weeks.
Why Merrimack homeowners call Quality Merrimack Concrete for slabs
I write your estimate in person
I come out to look at every job and write the estimate myself, and I'm on site running our own crew when we do the work. You deal with the same person from the first walk around the lot to the finished slab, so nothing gets lost along the way.
Pouring concrete since 2013
We've been in business since 2013, and I came to concrete after years on restaurant lines, where prep and timing decide how the plate turns out. Concrete works the same way, which is why we don't rush the base or the pour.
Licensed, insured, built to state code
We're licensed and insured. Every building in New Hampshire, Merrimack included, has to meet the minimums in the state building code, and we work to that and to whatever the local office asks for your job.
What matters most on a slab is getting the base right before any concrete shows up. Tell us about your project or call (603) 377-5028, and I'll set a time to come look.
Slab foundations and site prep in Merrimack
For a slab foundation here, the office to ask is the Merrimack Building Division, which handles building permits and takes applications online through OpenGov. That office decides what your job needs, so we'll help you get the paperwork moving early and build to what they ask.
The ground matters as much as the paperwork. On New Hampshire lots that have been dug out, filled or reworked, the soil can change a lot from one spot to the next, and the only way to know is to look on site, which is why I ask about fill at the estimate and we check what's under the topsoil before we set forms. Low, bowl-shaped spots often have water sitting close to the surface for part of the year, usually highest in spring around April, so on those lots we plan the grade and the gravel for the wettest month, not the driest. We see the same mix of old fill and wet low ground on jobs in Nashua and Bedford.
Questions about slab foundations in Merrimack
How much does a slab foundation cost in Merrimack, NH?
A reinforced concrete slab in the Manchester area usually costs about $7 to $12 per square foot, and that's a general market figure, not our price. Your own number comes from the estimate I write on site, and our work is backed by our satisfaction guarantee.
How long does a new concrete slab take to cure before you can use it?
You can usually walk on a new slab within 48 hours, but concrete takes about 28 to 30 days to fully cure, meaning it keeps hardening and gaining strength all that time. General guidance is to wait a week before putting heavier loads on it, to be safe. Air and ground temperature, humidity, wind, slab thickness and the mix all change how fast that goes, so I'll tell you what to expect for yours.
Can a slab foundation help keep radon out of a house?
Yes, and the time to plan for it is while the slab is being designed. National guidance says building radon-resistant features in during construction typically costs less than treating the house afterward, and many builders include them as a matter of course. The cost of those features can vary widely, so I'll price them as their own item if you want them.
What causes cracks in a new concrete slab, and can you stop them?
Concrete shrinks as it dries and the ground moves a little, so most slabs crack somewhere, and steel inside won't prevent that. Industry guidance says properly sized and placed reinforcement should keep the cracks that do show up tightly closed, so judge a reinforced slab by how tight its cracks stay, not by whether any appear. A crack that keeps widening is the one worth a call.
Does a slab foundation price include a stained or stamped finish?
Usually not, since typical slab prices leave out staining and stamping. If you want a colored or patterned surface, ask for it separately so you can see what it adds, and look at our decorative concrete work for ideas.
How do I get an estimate for a slab foundation in Merrimack?
Call (603) 377-5028 or send the form with the lot's location, the slab size you're planning in square feet and any fill you know of on the site. Those three things tell me what to look for when I come out, so the estimate fits your lot.
Related concrete work for new buildings
Foundation installation
When your house plans call for a basement or poured walls instead of a slab on the ground, this is the work your house will stand on.
Concrete parking lot building
For a shop or small business that needs concrete parking beside its building, laid on a dug-out, packed base that stands up to cars every day.
Service areas for slab foundations near Merrimack
Quality Merrimack Concrete is based in Merrimack, NH, and the 12 cities below each have their own page, from Manchester, NH to Tyngsborough, MA. We build slab foundations across them and in many more cities nearby.
Merrimack, NH
Get your slab planned before the dig
Changing what goes under a slab costs little on paper and a lot once the concrete is down, so call (603) 377-5028 or send the form while your plans can still change.