Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Owens Corning Home Additions & ADU: The Orlando Owner’s Guide
We install and service Owens Corning home addition and ADU projects throughout Orlando, with most full projects landing between $45,000 and $130,000 depending on square footage, foundation work, and finish level. That’s the honest range you should budget before calling anyone. What usually brings Orlando homeowners to this page is an existing addition or ADU that’s showing its age: a roof tie-in leaking during summer downpours, insulation that never performed well, or an exterior wall system that’s delaminating in Florida humidity. We’ll walk you through what’s failing, why it failed, and what it actually costs to make it right.
If you’re mid-project or mid-problem, call (850) 809-0306 and we’ll give you a written price before any work starts. No surprises, no vague “we’ll see when we open it up” pricing. That’s how Sawyer Remodel Orlando has operated since 2005, and Luca Romano still signs off on every estimate personally.
Which Owens Corning Models This Applies To
Owens Corning doesn’t manufacture a single “home addition” product. What they make are the building envelope systems that wrap an addition or ADU: insulation (including the PINK fiberglass batts and FOAMULAR rigid board lines), roof decking underlayment, and the exterior wall sheathing and weather barrier products used in their Total Protection System. If your Orlando addition was built with Owens Corning materials, the compatibility question comes down to which generation of product went in.
Here’s the gotcha most homeowners don’t know: FOAMULAR rigid board installed before roughly 2015 uses a different facer and joint treatment than current production. If you’re patching or extending an older ADU wall, you can’t just butt new board against old and tape it. The joint will fail within a season or two, especially with Orlando’s wet summers and high humidity. The right approach is to strip back to a clean edge, install a compatible joint sealant rated for both facers, and re-flash the transition. This is exactly the kind of thing we check during the estimate, not after we’ve opened the wall. We also work with compatible systems from KraftMaid, Cambria, and Silestone on the interior finish side, so your addition is covered from sheathing to countertops without mixing unmatched materials.
Styles & brands we work with
Signs Your Owens Corning Home Additions & ADU Is Failing
- Water staining at the roof tie-in. The seam where an addition’s roof meets the original house is the most common failure point in Orlando. Flashing shifts during thermal expansion, and Owens Corning underlayment can’t compensate once water gets behind it. You’ll see staining on the ceiling below the junction before you see it from outside.
- Mold or mustiness on interior drywall near the floor. In slab-on-grade Orlando additions, moisture wicks up through the slab and gets trapped if the exterior insulation wasn’t installed with a proper vapor profile. FOAMULAR board is closed-cell and can trap moisture if applied incorrectly below grade.
- Bowing or soft spots in exterior walls. High humidity plus a failed joint in the weather barrier lets moisture sit inside the wall cavity. Owens Corning fiberglass batts lose R-value dramatically when even slightly damp, and the OSB sheathing behind them will eventually rot.
- Higher energy bills with no obvious cause. Orlando summer heat finds every gap. If your addition’s insulation has compressed in the attic or shifted in the walls, your AC is working harder than it should. A 15-year-old addition with original fiberglass batts typically runs 20 to 30 percent less efficient than it did when built.
- Cracks at the addition’s foundation line. Orlando’s sandy soils shift, and older additions weren’t always tied to the original structure properly. You’ll see cracks running vertically at the corners where the addition meets the house, then widening over a wet season or two.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
The $45,000 to $130,000 range for an Owens Corning-based home addition in Orlando covers a lot of ground because additions are never just one thing. A simple 200-square-foot bump-out with a slab foundation, basic framing, and matching finishes starts around $45,000. A full in-law suite with a bathroom, kitchenette, separate entrance, and upgraded Owens Corning envelope materials can push past $130,000. Here’s what that looks like in line items:
- Foundation and site work: $6,000 – $18,000 depending on slab vs. crawl space and soil conditions
- Framing and roof integration: $12,000 – $35,000 depending on roof complexity and tie-in condition
- Owens Corning insulation and weather barrier system: $3,000 – $9,000 for full envelope coverage
- Windows, doors, electrical, and rough plumbing: $8,000 – $25,000
- Interior finishes (drywall, paint, trim, flooring): $10,000 – $30,000
- Bathroom or kitchenette add (if applicable): $9,000 – $28,000
Every estimate from Sawyer Remodel Orlando includes a written line-item breakdown, a fixed price before work starts, and our 365-Day Done Right Promise in writing. If something isn’t done right, we make it right. No arguments, no change orders, no “that was in the fine print.” Call (850) 809-0306 for an exact quote on your specific addition.
DIY or Call Us?
Some inspection work you can do yourself: check for visible water staining near the roof tie-in, look for cracks at the foundation corners, and feel along exterior walls for soft spots or unusual warmth in the afternoon. These will tell you if something’s wrong. What they won’t tell you is what and how deep.
Anything involving opening a wall, re-flashing a roof junction, or re-insulating a cavity means working with materials that can hurt you if handled wrong: sharp flashing edges under tension, fiberglass particles, and the real possibility of hitting electrical or plumbing you didn’t know was there. This is structural envelope work, not a weekend project. If the problem is at the roof tie-in or anywhere moisture has already gotten in, the longer it sits, the more expensive it gets. Call (850) 809-0306 and let us put eyes on it. The estimate is free, and you’ll know the real number instead of guessing.
FAQs
With proper installation and maintenance, the Owens Corning envelope components on a Florida addition should last 20 to 30 years, but the roof tie-in and any flashing details typically need attention every 8 to 12 years due to Orlando’s heat and wet season cycles. The structure itself will last as long as the house if it’s built right. Call (850) 809-0306 and we’ll assess where your addition is in that lifecycle.
Yes, in most cases. Roof tie-ins can be re-flashed, isolated wall sections can be opened and re-insulated, and foundation cracks can be stabilized if caught early. Full rebuilds are usually only necessary when moisture damage has been ignored for years. We’ll tell you honestly which situation you’re in during the estimate, not after we’ve started demo.
A simple addition typically runs 8 to 16 weeks depending on permitting and weather. ADUs with full kitchens and bathrooms run 12 to 24 weeks. Orlando’s permitting office adds time during peak season, and we handle all of that so you’re not chasing paperwork. We’ll give you a schedule with your written price, and photo updates before and after every major phase so you’re never wondering where things stand.
We order Owens Corning insulation, underlayment, and sheathing per job so you get the correct product for your specific addition, not whatever’s been sitting in a warehouse. For common repairs like small re-flash jobs and insulation patches, we carry the basics on our trucks. Everything we install is OEM or manufacturer-approved equivalent, never off-brand mystery material.
Good work doesn’t need a speech – it just needs to hold up.
If your Owens Corning addition or ADU in Orlando is showing any of the signs above, or if you’re planning a new build and want it done right the first time, call (850) 809-0306 to schedule your free estimate. Luca and the Sawyer Remodel Orlando crew will give you a written price, a real schedule, and a year of accountability after the job closes.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Orlando at Sawyer Remodel Orlando, serving Orlando and nearby areas.
