Therma-Tru Door Installation Nationwide | Sightline Windows & Doors Miami Gardens

Therma-Tru Door Installation: The Miami Gardens Owner’s Guide

Therma-Tru door installation in Miami Gardens typically runs $1,800-$4,200 for a complete entry system replacement, depending on whether you’re keeping the same rough opening or reframing for a larger unit. We stock Therma-Tru-compatible jambs, sills, and hardware kits on our trucks, and most installs finish in a single day once the measured survey is complete. Homeowners usually notice trouble when the door sticks seasonally, daylight shows around the perimeter, or the fiberglass skin separates from the frame at the corners after years of Miami Gardens humidity cycles.

Call (754) 354-6649

Which Therma-Tru Models This Applies To

Therma-Tru organizes its entry doors into series families, and the part you need depends on which family yours belongs to. The Classic-Craft line uses a thicker 2-inch jamb with integrated composite sill, while the Smooth-Star and Fiber-Classic series share a 1-3/4-inch jamb profile but use different hinge mortise patterns. Check the hinge side of your door for a stamped series mark, or look for the white adhesive label on the top edge of the slab that lists the SKU and manufacturing date.

The Classic-Craft Oak and Mahogany collections require a specific hinge reinforcement plate that differs from the standard Smooth-Star backing; we’ve seen homeowners order the generic plate and discover the screw holes don’t align by 3/16 inch. For sills, Therma-Tru’s adjustable composite unit (part Sill-37 on most Classic-Craft installs) outlasts the aftermarket aluminum replacements we’ve tested, but only if the original sub-sill hasn’t rotted. We carry both OEM and verified aftermarket equivalents on our trucks, and we’ll show you the part before we open the packaging.

Sightline Windows & Doors Miami Gardens is an independent service provider, not affiliated with Therma-Tru.

Signs Your Therma-Tru Door Installation Is Failing

• The door drags or binds between November and April. Miami Gardens’ dry season shrinks wood framing while the fiberglass slab holds dimension, which compresses the weatherstrip and wears the hinge screws loose in their mortises. We check frame plumb and hinge screw depth before quoting; often the fix is reframing, not just adjustment.
• Daylight visible at the top corner of the latch side. This usually means the composite jamb has twisted out of square, a common failure when the original install skipped long screws through the strike plate into the stud. The gap lets conditioned air escape and drives up cooling loads; we measure it in sixteenths and document the reading.
• Soft or discolored flooring just inside the threshold. The Therma-Tru adjustable sill has a weep system that clogs with pollen and roof grit during Miami Gardens’ summer storms. Water backs up, crosses the sill pan, and rots the subfloor; by the time you see staining, the sill pan and adjacent framing need inspection.
• Fiberglass skin delaminating at the bottom rail or lock block. This happens when the door faces west or south without adequate overhang, and the factory seal fails after 8-12 years of UV exposure. The skin lifts, moisture gets in, and the polyurethane core swells; we replace the slab rather than attempt a cosmetic repair.
• Lockset feels loose or the deadbolt doesn’t throw smoothly. Therma-Tru’s lock block is composite, not solid wood, and the screw holes wallow out if the original installer used standard 3/4-inch screws instead of the specified 2-1/2-inch structural fasteners. We bore and fill with hardwood dowel, then re-drill to factory spec.

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Replacement Cost & What’s Included

What drives the range: the condition of your rough opening, whether the original install used proper flashing tape and sill pan, and whether we need to match a custom paint or stain finish. Every quote lists line-item material and labor; Haven Clause 1 means the written price and the final invoice are the same document. Our 365-Day Done Right Promise covers the installation, and we leave you the documented photo record before we pack up.

DIY or Call Us?

There’s safe checking, and then there’s work that belongs to a crew with the right tools.

You can verify the series mark and measure your rough opening width and height in three places each; record those numbers and the hinge count (three or four). You can also clear the sill weep holes with a piece of wire and confirm water drains outward, not inward. What we don’t recommend: attempting to pull a prehung unit solo, cutting into a load-bearing king stud, or adjusting hinges while the door is under its own weight. We’ve been called to Miami Gardens jobs where a homeowner’s helper dropped a Classic-Craft slab and cracked the corner; the $400 mistake became a full slab replacement.

The fiberglass skin is repairable only in a controlled shop environment; field repairs crack within two seasons. If the spec isn’t on the page, it isn’t part of the job. Call (754) 354-6649 and we’ll schedule the measured survey; you’ll keep the document, and the written price arrives before any work starts.

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