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Before
AfterTherma-Tru Fence Installation: The Redwood City Owner’s Guide
Therma-Tru fence installation in Redwood City typically runs $3,500-$9,000 for a complete vinyl system, with most residential projects falling in the $4,500-$6,500 range depending on linear footage and terrain. We stock Therma-Tru-compatible posts, rails, and gate hardware on our trucks, and we can usually schedule installation within a few business days of your call. Most Redwood City homeowners discover their Therma-Tru fence needs attention when gate sag becomes visible, post caps crack after a wet winter, or pickets start pulling away from rails in the gap between Emerald Hills and Farm Hills where the clay soil shifts seasonally.
Which Therma-Tru Models This Applies To
Therma-Tru manufactures vinyl fencing across several series lines, and the part you need depends on the profile shape and vintage of your system. The Classic series uses 5-inch square posts with routed rail pockets; the Chesterfield and Lexington lines use a slightly different rail profile that is not interchangeable without adapter brackets. If your fence was installed between 2010 and 2018, check the underside of the post cap for a molded date stamp and series code, Therma-Tru’s primary identification method during that period. Post-2018 systems moved to an embossed label on the rail interior.
We source OEM Therma-Tru components direct from the distributor in San Jose, though for discontinued series we spec quality aftermarket equivalents from Bufftech that match the wall thickness and UV stabilizer package. The aftermarket rails we use carry the same 0.055-inch wall thickness as Therma-Tru OEM, which matters in Redwood City’s sun exposure, thinner walls chalk and crack faster here. One compatibility gotcha: Therma-Tru’s gate hinge plates from the pre-2015 Classic line use a 3/4-inch offset that newer universal hinges do not match without shimming, and most homeowners do not discover this until the gate drags within a month of replacement.
Signs Your Therma-Tru Fence Installation Is Failing
- Gate sag or drag. The gate frame has twisted or the hinge post has tilted in its concrete footing. In Redwood City’s hillside neighborhoods like Farm Hills, post settling after winter rains is the usual cause, not the gate itself.
- Rail popping out of post pockets. Thermal expansion has overcome the rail lock, or the post pocket has cracked from impact or UV fatigue. This accelerates after about 12-15 years in Peninsula sun exposure.
- Chalky or brittle pickets. The titanium dioxide UV barrier has depleted. South-facing sections in Redwood City show this first, often at year 10-14 depending on the original spec grade.
- Post cap splitting or blow-off. Caps are cosmetic but their failure signals underlying post swelling from water intrusion, common where sprinklers hit the fence line daily.
- Concrete footing exposure or heave. The post base is no longer fully encased in concrete. Redwood City’s clay-heavy soils expand and contract with moisture, working posts loose over 5-7 wet seasons.
Before
AfterReplacement Cost & What’s Included
| Scope | Price Range |
|---|---|
| Single gate rebuild (posts, frame, hardware) | $1,200-$2,800 |
| Section replacement (2-3 posts, 8-12 ft rail run) | $1,800-$3,500 |
| Full yard perimeter, 100-150 linear ft | $4,500-$7,500 |
| Full perimeter with grade changes, 150-200 linear ft | $6,500-$9,000 |
What drives the range: soil condition (rock or clay requires longer post holes), slope (stepped installation adds labor), and whether we are tying into existing concrete or pouring new footings. Every quote is a flat written price with line-item scope, delivered before work starts, under Clause 1 of the Haven Standard. Our vinyl fence work carries the 365-Day Done Right Promise, and you receive a documented photo record of the post depths, footing pours, and finished grade before we leave.
DIY or Call Us?
An owner can safely inspect their own fence: check post wobble by hand, look for cracked rail pockets with a flashlight, and verify gate hinge bolt tightness with a socket set. What goes wrong in DIY is usually the post footing. Setting a 4×4 or 5×5 vinyl post in Redwood City’s clay soil requires 30-36 inches of depth and a concrete collar flared at the base to resist frost heave and seasonal swelling. We have pulled too many homeowner-installed posts that were set 18 inches deep in a straight-sided hole, they lean within two seasons. The posts and rails themselves are not dangerous to handle, but a 75-pound bag of concrete in a 36-inch hole with a short post level is awkward work that tends to get rushed. Call (650) 560-7228 and we will quote it in writing, no obligation.
FAQs
Properly installed Therma-Tru vinyl fencing lasts 20-30 years in Redwood City’s climate, though south-facing gates and rails may show UV surface chalking at year 12-15. The key variable is the original wall thickness and whether the installer used concrete footings sized for clay soil expansion. Call (650) 560-7228 for an exact quote on replacement or extension - estimates are free.
Individual posts, rails, and pickets can be replaced if the series is still in production or we can match the profile with an aftermarket equivalent. If the failure pattern is systemic, chalking and cracking across multiple sections, replacement is more cost-effective than piecemeal repair. We will tell you which category you are in after a site visit, and we offer a Free Second Opinion on any written estimate you have already received.
A single gate or section replacement is typically one day; a full 150-linear-foot perimeter is 2-3 days depending on concrete cure time for post footings. We do not rush the concrete set, which is why our post warranty claims in Redwood City are minimal. Call (650) 560-7228 to schedule - we answer live 24/7.
We stock common post sizes, rail brackets, and gate hardware for Therma-Tru and compatible systems; specialty colors or discontinued series profiles are ordered from San Jose with 2-3 day lead time. We also stock KraftMaid cabinet hardware, Cambria and Silestone countertop supports, and other brand-specific components across our trades. If you have a part number from your original installation paperwork, text it to us and we will confirm availability before we arrive.
Measure twice, document once, build it so it doesn’t come back. That is how Grant Rowan has run this crew since 2007, and it is why we still pull permits, sign change orders, and deliver a written price before any work starts. Every time.
Ready to get your Therma-Tru fence sorted? Call (650) 560-7228 to schedule your free estimate. We will walk the line with you, name the price in writing, and show you the photo record when we are done.
Written by Grant Rowan, Owner, Rowan Construction Group Redwood City at Rowan Construction Group Redwood City, serving Redwood City and nearby areas.