Open walls, custom builds and additions
New Construction & Remodel Insulation in Prosper, TX
The one time every cavity is open, insulated to the spec you choose.
- Free in-home estimates
- Written quotes with foam type, inches and R-value per area
- Attic equipment and duct leaks checked before we insulate
Insulating While the Walls Are Open
New construction and remodel insulation is the best chance to get insulation right, because every stud bay, rafter and joist is open. Prosper and its neighbors are still building: the 2020 census counted 9,869 housing units in Prosper, and much more has been permitted since. Custom homes, additions, garage conversions, kitchen and bath remodels that take walls down to the studs, and homes rebuilt after storm damage all pass through a stage where foam can go anywhere.
Walls
Open-cell foam fills a 2x4 or 2x6 cavity and seals around outlets, wiring and plumbing. Closed-cell gets more R-value into each inch and adds stiffness, which matters in thin walls or where you want a vapor retarder. The 2021 IECC base table, which Prosper adopted for permits from May 1, 2023, lists R-20, R-13 plus R-5 continuous, or R-15 continuous for wood-frame walls in Zone 3. A full 2x6 cavity of open-cell or a few inches of closed-cell in a 2x4 can get there. Fixr lists new construction spray foam at $2.75 to $6.50 per square foot.
Roofs and ceilings
On new homes, builders and owners can choose a sealed attic from the start, with foam on the roof deck, or a vented attic with deep blown-in on the ceiling. The 2021 IECC lists R-49 for Zone 3 ceilings. If the HVAC equipment will be in the attic, a sealed attic designed in from the start costs less than converting later. Cathedral ceilings and vaulted rooms usually get closed-cell, because rafter depth is limited.
Additions and remodels
Where an addition meets the existing house, the joint is a common weak spot: new framing tied to old, a roofline that meets the original attic, a floor that sits partly over a slab and partly over a crawl space or garage. We pay attention to those seams. For remodels, we can foam the open walls and, while we are there, seal any attic leaks above the remodeled rooms.
Working with builders and inspections
We schedule spraying after rough-in plumbing, electrical and HVAC are done and before drywall, and leave the job ready for the town's insulation inspection where one is required. On request we provide the product data and thickness per area for the builder's or energy rater's paperwork.
Call (972) 838-1297 with your plans or schedule. Get a free estimate
What We Insulate on Open Framing
Each assembly is priced separately so you can choose.
Exterior walls
Open-cell or closed-cell to the target R-value.
Roof decks
Foam for sealed attics designed from the start.
Vaulted and cathedral ceilings
Closed-cell in shallow rafters.
Floors over garages
Closed-cell under bonus rooms and second-floor rooms.
Rim and band areas
Sealing where floors meet walls.
Interior sound walls
Open-cell in media rooms, bedrooms and baths.
Published Wall & New Construction Insulation Costs
| Job | Range and source |
|---|---|
| Existing walls, spray foam | $3.15 to $7.50 per sq ft (Fixr) |
| New construction, spray foam | $2.75 to $6.50 per sq ft (Fixr) |
| All exterior walls, spray foam | $4,000 to $10,000 (HomeGuide) |
| Open-cell / closed-cell | $1.50 to $3.50 / $3.00 to $5.00 per sq ft (HomeGuide) |
| Dense-pack cellulose (closed walls) | $1.60 to $4.20 per sq ft (HomeGuide) |
| Blown-in exterior walls | $1,900 to $7,800 (HomeGuide) |
Fixr (2025) and HomeGuide (2026 and Nov 2025) publish these national figures. Wall height, framing depth, foam type and how much of the house is open decide the total. We price from the plans or a walk-through, and the written estimate is the price.
How a New Construction Job Runs
1. Review
Go over plans or walk the framing with the builder or owner.
2. Spec
Foam type and thickness per assembly, written to meet code.
3. Spray
After rough-ins and before drywall, in passes to depth.
4. Document
Trim, clean and provide product data for inspection.
Why Choose Us for New Construction & Remodel Insulation
Seams sealed
Joints between old and new framing get special attention.
Code-ready spec
Written to the town's adopted code for your permit.
On schedule
Timed between rough-in and drywall.
New Construction & Remodel Insulation Questions
Can you spray foam inside existing walls?
Standard spray foam needs open cavities. For closed walls, dense-pack cellulose or injection foam are the options. If walls are coming down to the studs anyway, that is the time to spray.
What R-value do new Prosper walls need?
Under the 2021 IECC base table, Zone 3 wood-frame walls need R-20, R-13 plus R-5 continuous, or R-15 continuous.
Do you work with builders?
Yes. We schedule around the build and provide product data for inspections.
Is foam better than batts in new walls?
Foam seals air leaks that batts cannot, which matters a lot for comfort. Batts cost less. We can price both.
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Get a New Construction & Remodel Insulation Estimate
Send us your plans or schedule and we will price the insulation in writing.