Therma-Tru Door Installation Nationwide | Sightline Windows & Doors North Palm Beach

Therma-Tru Door Installation: The North Palm Beach Owner’s Guide

Therma-Tru door installation in North Palm Beach typically runs $1,800-$4,200 for a complete fiberglass entry system with frame, depending on whether the rough opening needs correction and whether you’re stepping up to an impact-rated unit. We stock Therma-Tru-compatible frames, sills, and hardware on our North Palm Beach trucks, and most replacements survey to install in one working day once the written scope is signed. Most owners discover their door is failing when the fiberglass skin separates from the frame at the hinge side, or when water pools on the interior sill after a summer storm - both signs that the installation, not just the door, has reached its limit.

Call (561) 475-1246

Which Therma-Tru Models This Applies To

Therma-Tru’s fiberglass entry door lines break into three categories we see in North Palm Beach: the Classic-Craft series with its hardwood-edge construction, the Smooth-Star paint-ready surface, and the Fiber-Classic with its oak-grain texture. The critical compatibility gotcha is the hinge mortise spacing: Classic-Craft uses a 5/8-inch radius corner on the hinge prep, while Smooth-Star and Fiber-Classic ship with square-corner hinges. Swap them and the door won’t seat flush, which is how we find most “leaking” doors in Lakeside Park - the unit was correct, the prep was not.

We check the AAMA label inside the hinge stile for the series code and the manufacturing date. Pre-2019 units used a composite frame with a different screw-holding pattern; current frames are fully composite with integrated aluminum reinforcement. OEM frames from Therma-Tru run 15-20 percent above quality aftermarket equivalents from Endura or Nantucket, but the OEM sill cap profile matches the original weatherstrip groove exactly. On retrofit jobs where the stucco return is already cut, that fit matters more than the savings.

Sightline Windows & Doors North Palm Beach is an independent service provider, not affiliated with Therma-Tru. We specify by what the opening requires.

Signs Your Therma-Tru Door Installation Is Failing

• Visible gap between the fiberglass skin and the frame edge. The adhesive bond breaks down after 8-12 years in South Florida’s UV and humidity cycle. Once the skin lifts, the structural foam core absorbs moisture and the door gains weight, stressing the hinges.
• Water staining on the interior sill or baseboard directly below the door. This usually traces to a failed sill pan or an end dam that wasn’t sealed to the rough opening during original installation. North Palm Beach’s driving rain from the east hits this exact spot.
• Door sticks at the top corner opposite the hinges in summer, then gaps in winter. The frame is racking because the long screws didn’t bite into the king stud, or the composite frame itself has fatigued. Seasonal humidity swings in Palm Beach County make this worse.
• Light visible around the perimeter weatherstrip when the door is closed. The adjustable strike plate has been cranked inward too many times, compressing the bulb seal permanently. The fix is rehanging the door on a plumb frame, not a thicker weatherstrip.
• Hinge screws spin freely or the door sags despite tightening. The composite frame’s screw-holding zone has stripped. On pre-2019 units this is often terminal; current frames accept a helicoil repair, but we document the failure for the homeowner’s record.

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Replacement Cost & What’s Included

What drives the range: the condition of the rough opening, whether the stucco return needs repair, and whether we’re matching an existing sidelite configuration. Every Therma-Tru installation we quote in North Palm Beach includes the measured survey you keep, the written scope with line-item pricing, permit pull if required, and the documented photo record on completion. The 365-Day Done Right Promise applies to the installation workmanship and the sealant line; the door itself carries Therma-Tru’s limited lifetime warranty on the fiberglass skin.

Haven Clause 1: the price on the page is the price on the invoice. We don’t start work until you’ve seen the written number.

DIY or Call Us?

There are two things a homeowner can safely check before calling: whether the hinge screws are actually loose (turn them by hand, don’t torque), and whether the sweep is dragging on the threshold because debris has packed into the track. Both take five minutes and a flashlight.

Where DIY goes wrong is the frame. A Therma-Tru prehung unit weighs 85-120 pounds depending on glass options, and the installation requires the door to be braced plumb while the long screws find the king stud. Get that wrong and the gap pattern shifts, the multipoint lock won’t engage, and you’ve damaged the stucco return. In North Palm Beach’s older concrete-block homes - common in Lakeside Park - the rough opening is rarely square to begin with. Sonia Raman measures every opening herself on the first visit because she’s seen what a quarter-inch assumption costs in lead time and money. If the opening isn’t right, the window isn’t right - that’s where we start.

For a written price before any tool is lifted, call (561) 475-1246.

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