Triple-Track Horizontal Slider
About this storm window
The horizontal counterpart to our flagship triple-track vertical, this unit runs two glass sashes and two fiberglass screens inside a hollow-tube aluminum frame engineered for side-loading openings. Independent channels let you slide either panel without disturbing the other, and the tubular extrusion holds geometry on wide spans where lighter frames sag over time. A strong choice when you need full-pane ventilation across a horizontal opening without sacrificing winter sealing.
Benefits
Horizontal OperationTwo ScreensFlexible Airflow
- Independent tracks provide ventilation from either side of the opening
- Two glass panels and two screens support flexible seasonal use
- Available in two-lite or three-lite layouts for wider spans
- Custom dimensions and pane orientation suit non-standard sliders
Why you'll love it
- Our most versatile horizontal system for wide openings and frequently used windows.
- The three-track design offers more airflow control without replacing the primary window.
Product specifications
- Custom sizes up to 108" wide by 60" high
- Frame finishes: Mill (Silver), White, Tan, Bronze, Black
- Glass options: clear, P62 obscure, or tempered safety glass
- Screen options vary by configuration and selected material
What's built into the frame
- Offset frame. The frame sits out from your existing window, so the sashes slide freely and a layer of still air sits between the two windows.
- Sealed on every side. Weatherstripping runs the full perimeter where the frame meets the sashes. Interlocks at the meeting rail, sill and head, plus wind deflectors at the top and bottom, cut down on rattles, dust, pollen and drafts.
- Mold- and mildew-resistant seal. The perimeter weatherstripping is made to resist mold, mildew and pollen.
- Spring-loaded sash locks. Nylon locks hold each glass and screen insert firmly in place.
- Fits slightly out-of-square openings. A peel-type mounting flange lets the frame size be adjusted for an opening that is not perfectly square.
- Flexible mounting gasket. A dual-density gasket around the mounting flange acts as a thermal break, reducing energy transfer through your existing window.
- Powder-coated finish. A durable powder-coat finish holds its color.
How to measure
- Take three width and three height readings, then mark the smallest of each as opening fit checks.
- Choose a two-lite or three-lite layout before confirming the operating side.
- For three-lite units, record the desired fixed center-lite width.
Installation and care
- Keep the sill perfectly level across the full span.
- Test every panel and screen for smooth travel before tightening the perimeter fasteners.
- The frame does not come with pre-drilled installation holes. Use the correct drill bit to make pilot holes, then fasten it with suitable exterior wood screws.
- Apply exterior-grade caulk across the top and down both sides. Do not caulk the bottom edge.
- Exterior storm windows have weep holes at the bottom of the frame so moisture that collects between your existing window and the storm window can drain out. Never caulk over the weep holes.
Financing with Affirm
Financing with Affirm
Pay over time on eligible orders. Affirm shows the terms of each plan offered to you before you accept one.
Lifetime limited warranty
Covered for as long as you own and live in your home. Frames and sash members are warranted against deterioration, cracking, peeling, rusting and blistering; locks and balances are warranted not to break under normal use; screen material is warranted against rust and rot. If you sell, the next owner is covered for ten years from the original purchase date. Proof of purchase is required.
Coverage detailsProtected shipping
Eligible small exterior windows ship in individually protected cartons by Ground. Vinyl interior and Low-E aluminum windows, larger windows, doors and bulk orders use protective pallet packing and delivery.
Shipping and handlingSimple DIY installation
Step-by-step installation guides for every style we sell, so you can put it up yourself.
Installation guidesMade to your measurements
Each unit is made to the dimensions you enter, so measure carefully before you order.
Measuring guidesEstimated Production Time: 5-7 weeks (high season)
Lead times are estimates and may change based on order volume, materials, weather, and shipping conditions.
- Delivery is calculated at checkout. Small eligible windows can ship Ground; larger shipments use protected pallet delivery.
- Product prices exclude shipping and handling. The checkout delivery charge includes protective packaging and the delivery service shown for your address.
- Delivery varies by destination, dimensions, and shipment size. See the shipping charge at checkout before paying. View delivery details
Need professional installation?
Homeowners can request installation at checkout. We will send a separate installation quote within 24 hours after the order is placed. Installer-coordinated delivery may also avoid residential liftgate charges and reduce shipping costs.
Request an installation quoteYou May Also Like
3 Reasons to Love Storm Windows
Keep the character you love
Add a made-to-measure layer while keeping the original windows, proportions, and details that make your home yours.
Make room for comfort
A well-fitted storm window can help reduce drafts. Choose the mounting style and glass that suit your existing windows and the way you live.
A fit for your everyday
From fixed picture panels to operating sliders, choose a configuration around your view, ventilation needs, and access for cleaning.
FAQs
What is the Triple-Track Horizontal Slider Storm Window?
The Triple-Track Horizontal Slider Storm Window is an exterior storm window made to the exact width and height of your opening. It fits a horizontal slider or a window that is wider than it is tall. The panes slide side to side in their tracks.
Does the Triple-Track Horizontal Slider Storm Window include a screen?
Triple-track combinations carry two glass panes and a screen so you can change position through the seasons.
Which frame colors does the Triple-Track Horizontal Slider Storm Window come in?
Silver (mill), White, Tan, Bronze and Black. Choose the frame color on the product page after you enter your measurements; the preview image updates to match.
How do I measure for the Triple-Track Horizontal Slider Storm Window?
Choose how your window mounts: blind stop, overlap or window track. Measure the width at the top, middle and bottom and record every reading exactly as measured. Measure the height down both sides, stopping at the bottom of the drop on a drop sill or at the highest point of the sill on a standard sill. Do not add or subtract an allowance. We keep the readings for fit review and build only to the dimensions confirmed for the order. Our horizontal window measuring guide covers each step.
Which mounting method am I?
Look at how an exterior storm window would attach. If there is a blind stop, a narrow strip of trim set against the window frame, it attaches into the blind stop. If the window has flat casing around it and the storm would sit on the outside face of that trim, it is an overlap mount. If the window has a screen track the storm can slide into, it is a window-track mount. Choose yours in our measuring guide and the steps change to match; if you are not sure, send photos and we will tell you.
Do you add or subtract anything from the measurements I enter?
No. Enter every measurement exactly as taken. Do not add overlap or subtract clearance. We keep all readings for fit review and build only to the dimensions confirmed for the order.
Is the Triple-Track Horizontal Slider Storm Window right for my window?
Choose it when your existing window is a horizontal slider or a window that is wider than it is tall. If you are unsure how your window operates, send us a photo and we will point you to the right style.
Does the Triple-Track Horizontal Slider Storm Window have weep holes?
Yes. Exterior storm windows have weep holes at the bottom of the frame so moisture that collects between your existing window and the storm window can drain out. Never caulk over the weep holes.
What affects the price of the Triple-Track Horizontal Slider Storm Window?
The width and height you enter, the frame color and the glass you select set the price shown on the product page. Oversized openings may need a quote, and shipping and tax are calculated at checkout.
Compare Your Options
Swipe the table to compare options →
| Consideration | Our Custom Storm Windows | DIY Window Film Kits | Full Replacement Windows |
|---|---|---|---|
| Your existing windows | Keep sound original windows in place | Keep existing windows; apply film over the opening | Replace existing window components |
| Materials | Framed glass panels with product-specific glazing choices | Thin shrink-to-fit plastic film and adhesive tape | New frame and glazing system; materials vary |
| Fit and finish | Made-to-measure sizes and a choice of frame finishes | Film trimmed to the opening | Sizes and finish choices vary by product |
| Ventilation | Fixed or operating configurations available | Film must be removed to access the covered opening | Operating options vary by product |
| Project scope | Add a fitted layer to a suitable existing opening | Apply tape, fit film, and shrink it with heat | Remove and install window components; finishing work may be needed |
| Where the value is | Custom fit and reusable framed panels while retaining existing windows | A simple, temporary draft-control approach | An option when the existing window needs replacement |
Compare the complete project, including glass, installation, shipping, and the condition of your existing windows. Features and costs vary by configuration and supplier.
Learn more: window film kits · storm windows and replacement options.
Is Interior or Exterior Right for You?
Two ways to add comfort while keeping the windows you love. Start with your mounting space and how you use each room.
Interior Storm Windows
An inside-mounted layer for homes where preserving the exterior appearance matters.
- Access from inside your home
- Removable or operating configurations
- Check mounting depth and hardware clearance
Exterior Storm Windows
An outside-mounted layer with fixed and ventilating styles for a range of openings.
- Choose fixed, vertical, or horizontal operation
- Coordinate the frame finish with your home
- Check mounting surface and drainage
Not sure where to start?
Talk to our team
Send us your opening sizes or a photo and we will help you choose the right style, finish and glass.
Need installation supplies?
Select screws, sealants, trim and other supplies to request with your project. We confirm fit, quantity and shipping before payment.
Choose installation accessories