Open-cell spray foam in Roswell
If someone quotes foam for a Roswell attic, this is probably the product. It is the softer stuff. It fills weird cavities, costs less per inch than closed-cell, and in dry air that is usually the right trade.
What you are actually buying
The crew heats two liquids, mixes them at the gun, and the mix blows up in a few seconds. Open-cell stays spongy. Air cannot push through a continuous layer of it. Batts lose that fight in a messy attic. Water vapor still can, so do not treat it like a vapor barrier. That distinction matters more on a crawl or a wet pipe than it does under a shingle roof in Chaves County.
They spray in lifts so the foam does not cook itself, then trim the extra flush with rafters or studs. Manufacturers talk about half a pound per cubic foot and R-3.6 to R-3.9 per inch. Fine as a range. Useless as a promise for your house. The quote needs a product name and a finished depth.
Attics first, then the odd walls
A lot of the housing here is one story with an attic that was never really detailed. Clear July sun will drive that space well past 130°F. If the plan is an unvented attic (foam on the underside of the roof, air handler living up there instead of baking), open-cell is what most local crews start with.
Interior 2x4 walls and the floor over a garage are the other common asks. Empty bays in a pre-1980 ranch leak when spring wind hits the west side. Foam can fill those from inside, but only if someone has a plan for the drill pattern, the patches, and the electrical boxes. That is a slower job than an open attic.
Occupied rooms still need a thermal or ignition barrier, usually 1/2-inch gypsum. Attics and crawls need an approved coating if they stay unfinished. If the bid never mentions that, they skipped it.
You can still want closed-cell at the crawl or the rim joist and open-cell in the attic. Mixed houses are normal. More on closed-cell and on what jobs cost here.
Useful things to tell an installer
- Attic, walls, or both
- Whether you can see ceiling joists from the hatch
- Shingle, metal, or built-up roof, and any leaks you already know about
- If the air handler sits in the attic
Is open-cell a bad idea because Roswell is a desert?
For attics and interior walls, no. Open-cell lets vapor through, which is a real problem in Houston. Average humidity here is much lower. Crawl spaces are a different argument; a lot of installers still want closed-cell against soil.
How thick should an attic be?
That depends on the R-value they are selling, not a round number from a flyer. Open-cell is roughly R-3.6 to R-3.9 per inch. If two bids skip the finished depth, you cannot compare them.
Can they put it in a crawl space?
Some will. Ask why. Closed-cell is the more common call under a floor here because of soil moisture and pests. Cheaper is not automatically correct in that hole.
Get open-cell quotes for an attic or wall job
Tell us about the attic, crawl space, or building. Licensed local installers follow up. We do not send a crew.