Sliding Glass Doors

Most sliding glass door problems are repairs, not replacements — and we diagnose and quote them on-site. The most common call is a door that drags, sticks, or won't slide: almost always worn rollers (10-15 year typical lifespan) or a track packed with grit or dented by impact. We clean and straighten the track, replace the roller assemblies with heavy-duty units, and re-shim the door plumb so it glides through full travel again.

Off-track panels are the other frequent emergency — a heavy operating panel lifted or knocked out of the lower track, often after a forced-entry attempt. We reset the panel, replace damaged rollers and the track section if needed, and add anti-lift hardware so it can't happen again. For broken or foggy glass we replace just the insulated glass unit (IGU) in most cases — a single shattered pane or a failed, fogged seal does not require a whole new door. We carry common sizes and order tempered or laminated units to match the original.

We also repair handles and mortise latches, multi-point locks that no longer engage, weatherstrip and bottom sweeps that leak air and water, and screen doors that have jumped their track. When a door is genuinely past repair — frame rot, a bent aluminum frame, or obsolete hardware with no parts available — we say so and quote replacement instead. Security-related breaks (shattered glass, a door that won't lock) are prioritized as emergency calls, and we reach most of NJ same-day to secure the opening.

Properties in FEMA Special Flood Hazard Areas (SFHA) — A, AE, V, VE zones common throughout coastal NJ — must comply with NJ Flood Hazard Area Control Act and the local floodplain ordinance. For sliding glass doors specifically: the finished floor of the door opening must be at or above the Base Flood Elevation (BFE) plus required freeboard (typically 1-2 feet of additional elevation above BFE, varying by municipality). This often means doors install at sill heights well above the patio or deck outside, requiring a step-down on the exterior.

The threshold has to be designed as a watertight detail. We use heavy-duty aluminum thresholds with integral weep channels and a continuous bulb seal at the operating panel. Standard residential thresholds (1/2" to 1" height) often fail flood-zone freeboard. We spec elevated thresholds with proper flashing — sometimes 4"-6" above the exterior deck — and coordinate with the deck contractor for a code-compliant transition.

V-zone (velocity zone, coastal high-hazard) properties have stricter requirements: doors must be designed to withstand wave action, the structure must be elevated on piles, and the door framing must transfer wind loads to the structural diaphragm. We work with the project engineer on V-zone openings and don't substitute residential-grade doors for engineered V-zone assemblies.

Traditional sliding doors are XO or OX configurations — one operating panel (X) and one fixed panel (O) — in 6', 8', or 12' nominal widths. The operating panel slides behind or in front of the fixed. Maximum operating panel width is typically 4', constrained by what one person can move on rollers without power assist. Sealing is straightforward: standard weatherstrip and a single operating threshold.

Multi-slide doors are 3-, 4-, 5-, or 6-panel configurations where multiple panels stack to one side, opening the wall to a much wider opening (12'-24'+ on residential, larger on commercial). Two main types: stacking (panels park behind one another in a multi-track header) and pocket (panels disappear into a wall cavity for a fully unobstructed opening). Multi-slide doors are dramatically more complex: oversized headers (often requiring engineered structural beams), multi-track headers with precise alignment requirements, panel weights that often exceed 200 lbs each and require power-assist or careful manual operation.

Cost difference is substantial: a typical 8' XO sliding door installs for the price of a single panel of an equivalent multi-slide system. The multi-slide is the dramatic indoor-outdoor design feature; the XO is the functional patio access. We do both, and quote each transparently.

Manufacturers: Andersen 200/400 Series for traditional XO/OX; Andersen E-Series and A-Series for premium configurations; Pella Lifestyle and Reserve; Marvin Modern and Coastline; PGT WinGuard for impact-rated; LaCantina, NanaWall, and Western Window Systems for high-end multi-slide. We install all of these and have manufacturer training certification on the major systems.

Standard fiberglass-mesh sliding screens that come with most sliding doors are functional but limited: easy for cats and small children to push through, fragile against pet claws, and visually intrusive across the open door. We offer three upgrades.

Heavy-duty pet-resistant mesh (Phifer Pet Screen, Tuff Screen) — 7x reinforced polyester fiber. Holds up to claws and routine pushing. Drop-in replacement on existing screen frames. Typical upgrade cost: $200-400 per door.

Retractable screens (Phantom, Mirage, Genius) — screen retracts into a side cassette when not in use, invisible from the open door. Engages on demand. Excellent for sliding doors that double as primary patio access where the homeowner wants the door wide open most of the time. Cost: $800-1,500 per door installed.

Stainless steel security screens (Crimsafe, ScreenAway) — woven 316 stainless steel mesh in a heavy aluminum frame. Provides forced-entry resistance equivalent to a locked security door, plus pet and child resistance. Common on shore homes and security-conscious primary residences. Cost: $1,500-3,000 per door.

Standard residential sliding door locks are typically a single hook or mortise latch engaging a strike on the fixed panel jamb. Functional but easily defeated — sliding door break-ins are typically not lock failures but lift-and-pry attacks where the operating panel is lifted out of its track. Two upgrades address this.

Anti-lift kits (door pins or upper-track anti-lift blocks) prevent the operating panel from being lifted out of the lower track. $50-150 per door installed. We add these to every sliding door install as standard.

Multi-point locks engage the door at three to five points along the operating panel height with deadbolts driving into the frame. Significantly increases forced-entry resistance. Standard on premium and impact-rated doors (Andersen E-Series, Marvin Modern, PGT WinGuard) and a worthwhile retrofit on existing doors. $400-800 per door installed.

Smart locks: most major sliding door manufacturers now offer integrated smart-lock options (Andersen Smart Lock, Pella Insynctive). We install and program these as part of the door scope when specified.