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CertainTeed Home Additions & ADU: The Orlando Owner’s Guide
CertainTeed home additions and ADU projects in Orlando typically run $45,000 to $130,000 for a full addition, while a detached ADU runs $90,000 to $220,000 depending on size, site conditions, and finish level. We install CertainTeed siding, roofing, insulation, and trim packages as part of these projects, and we stock a working inventory of CertainTeed-compatible components in our Orlando shop. Most homeowners call us after they notice water intrusion along a sill plate, sagging insulation in a kneewall, or siding that has started to cup and pull away from the sheathing.
What you’re dealing with is rarely one failed piece. It’s usually a chain: a flashing detail that was never right, a vapor barrier that got punctured during a previous repair, or CertainTeed siding that outlasted the fasteners holding it. The good news is that these failures can be repaired without tearing down the whole structure. The better news is we can tell you exactly what’s wrong before you spend a dollar.
We are an independent Orlando contractor. We are not affiliated with CertainTeed, but we install and repair their products every week, and we stock the parts that fail most often in Florida’s climate.
Which CertainTeed Models This Applies To
CertainTeed makes a broad catalog across siding, roofing, insulation, and trim, and the compatibility rules vary by product line. For siding, the main lines we work with are Monogram, CedarBoards, and MainStreet. These are not interchangeable. Monogram is a .044″ panel with a specific nail hem profile. CedarBoards is a double 7″ lap with a deeper shadow line. If you install a MainStreet starter strip under CedarBoards, the first course sits proud and every course above it telegraphs the mistake.
For insulation, the stock answer is CertainTeed InsulSafe or OPTIMA blow-in, but if your addition was built before 2015, you may have the older TrueComfort system. The bags look similar. The material is not. We see this mix-up in attic additions around College Park and Winter Park more often than we’d like.
Here’s the practical bit: find the CertainTeed product label. It’s usually stapled to a stud in the attic, printed on the back of a siding panel, or visible on the edge of a trim board. If you can’t find a label, take three measurements: panel thickness, exposure (the visible face width), and the profile shape. Send us those numbers and a photo. We’ll match it.
On the OEM-versus-aftermarket question for CertainTeed specifically: for siding and trim, we recommend OEM. The color match on CertainTeed’s factory finishes is nearly impossible to replicate aftermarket, and Orlando’s UV load will reveal a mismatched panel within 18 months. For flashing, housewrap, and fasteners, quality aftermarket equivalents from GAF or Owens Corning perform the same or better. We’ll tell you which is which before you buy anything.
Styles & brands we work with
Signs Your CertainTeed Home Additions & ADU Is Failing
- Water staining along the bottom edge of siding panels. This usually means the starter course is wicking moisture from grade or a sprinkler head is hitting the wall. Fix the drainage first, then deal with the siding. Replacing wet siding without fixing the water source means you’ll do the job twice.
- Siding panels that rattle in the wind. CertainTeed vinyl expands and contracts with temperature. If the original installer nailed it tight to the sheathing, those nails have now pulled loose. The panels need to be rehung with the correct nail slot play, not just re-nailed tighter.
- Insulation that has settled or slumped in a kneewall. In Orlando’s humidity, CertainTeed batt insulation will compact if it was compressed during installation or if roof leaks have soaked it over time. A settled cavity loses most of its R-value. This is especially common in garage conversions in Baldwin Park and Audubon Park.
- Caulk and sealant failing around addition windows and door frames. CertainTeed products don’t fail first; the interfaces do. When we see cracking caulk on a two- or three-year-old addition, the problem is usually a sheathing gap that was never properly flashed. The caulk was someone’s shortcut.
- Drafty rooms inside the addition despite a newer HVAC system. This points to air leaks in the wall assembly: missing housewrap, gaps in the sill plate, or insulation that doesn’t fill the cavity. You can feel it most in the corners and along the baseboard on a cold (for Orlando) January morning.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a full home addition in Orlando, plan on $45,000 to $130,000. A detached ADU runs $90,000 to $220,000. If you’re repairing or replacing CertainTeed components within an existing addition, the numbers get much smaller: siding repair runs $400 to $1,800 when we’re patching panels, and a full re-side of a 400-square-foot addition runs $3,500 to $9,000. Insulation removal and re-blow runs $2,000 to $6,500 depending on attic size and access.
What drives the range on a full addition: foundation type (slab versus pier), roof tie-in complexity, whether the existing electrical panel has capacity for a subpanel, and the finish level you choose. A CertainTeed siding package with CedarBoards costs more than MainStreet, but it holds its color longer in Orlando sun.
Every quote we write is a line-item price in writing before any work starts. That price includes materials, labor, haul-off, and permit fees. It includes no surprises. Our 365-Day Done Right Promise covers the installation work: if anything we installed fails within one year of completion, we return and make it right at no cost to you.
DIY or Call Us?
You can safely check a few things yourself: look for visible gaps where siding meets trim, feel for drafts along baseboards on a windy day, and check whether insulation is sitting flat in the attic. Taking photos and measurements helps us diagnose before we arrive. That’s genuinely useful.
Where DIY goes wrong on CertainTeed repairs is nailing. Vinyl siding must float on its nails. Driving a nail tight or using the wrong fastener causes buckling in the first hot afternoon. Flashing is worse: a homeowner who “just replaces a couple boards” often creates a water path that damages the sheathing, and now we’re replacing framing instead of panels. If water has gotten behind the siding or the problem involves electrical work inside an ADU, don’t open that wall yourself. Call us at (850) 920-7745 before you cut anything.
Tell me what the problem is. We’ll figure out the rest from there.
FAQs
A properly built addition with CertainTeed products lasts 30 to 50 years in Florida, but the sealants and flashing details need attention every 8 to 12 years. UV and humidity break down caulk and fasteners long before the siding or roofing material itself fails. Call (850) 920-7745 to have us inspect yours before a small gap becomes a wall repair.
Most failures can be repaired without a full rebuild. We regularly replace individual siding panels, reflash window openings, and re-blow insulation without disturbing the rest of the structure. We’ll tell you honestly if a repair is throwing good money after bad, and the estimate for the repair is free.
Most siding repairs and insulation re-blows finish in one day. A full re-side of a small addition takes three to five working days including trim. A full home addition or ADU runs twelve to twenty weeks from permit to final walkthrough, and we’ll give you a written schedule before we start.
We keep common CertainTeed siding panels, starter strips, trim boards, and insulation on hand in our Orlando shop, along with flashing, housewrap, and fasteners. For color-matched or special-order pieces, we can typically secure them within a few days. We also stock parts for KraftMaid, Cambria, and Silestone. Call (850) 920-7745 to confirm what we have before you make the drive.
Written by Isaac Pruett, Owner, Mason Remodeling Co Orlando at Mason Remodeling Co Orlando, serving Orlando and nearby areas.
