Window Screen Repair in Lachine

Lachine, on the southwest shore of the island of Montreal, reads in three layers, and each one calls for a different screen. The oldest sits along the canal: brick duplexes and triplexes built in the early 1900s, back when windows were hung sashes. On those façades the screen never covered the whole opening — it slides between the two sashes and protects only the half that actually opens. The frames are close to a century old: swollen wood, thin aluminum, dimensions that match nothing sold today. Ordering a replacement screen off a retailer's shelf leads nowhere, because that size simply isn't stocked. What the frame needs is new mesh rescreened inside it, and aluminum mesh rather than fibreglass: in a hung window the screen is handled every time the sash goes up or down, and aluminum keeps its shape where fibreglass eventually buckles.

The second layer is post-war — whole streets of bungalows built as the borough spread inland, toward Saint-Laurent and Montréal-Ouest. Their original screens live in narrow aluminum frames, a profile retailers stopped carrying decades ago. The good news on those houses is that the frame is almost always still square: the mesh failed, not the structure, and rescreening inside the existing frame costs a fraction of having a new frame built to the same non-standard dimensions. The third layer is recent, near the waterfront: condos with windows and patio doors in common sizes, where parts are available and a single unit is finished in the same visit, with no part to order. Three eras, three different repairs — which is why a visit in Lachine starts with a look at the frames before anything else gets discussed, and why one address can call for a frame built from scratch while the next street over is fixed with off-the-shelf hardware.

The hung window is the signature of Lachine's older streets. Its screen lives between the two sashes, held by springs or simple clips, and comes out from inside: no scaffolding needed, even on a triplex's second floor. What wears it out isn't sunlight, it's friction — the screen moves every time the window is opened. Aluminum mesh is the default on those units even at a slightly higher cost: it distorts less and takes repeated handling better. When the frame itself has opened at a corner, we square it and pull it back together before rescreening; when it's too far gone to save, we build a frame to measurements taken on site, never to catalogue sizes. On these century-old sashes the frame and the mesh age at very different speeds: the mesh gives out long before the window does.

In the bungalows and the condos it's sliders instead. The screen runs sideways on a track, and the hardware almost always fails first: rollers wear out before the mesh does, the screen goes crooked, it binds, and you push harder — pushing is what tears the mesh. New rollers and a cleaned track fix the actual cause. Patio doors in the waterfront condos follow the same logic under heavier use: opened dozens of times a day all summer, they finish the season with slack mesh and flattened rollers. Mesh, rollers and track are all handled in the same visit, at your door, without hauling the panel off to a shop. On a recent condo the roller is an ordinary stock item; on a 1960s bungalow the track profile is scarcer, and the hardware has to be matched to what is in front of you rather than the other way around.

Lachine's real difficulty isn't technical — it's part administrative, part supply. In the brick triplexes the screens belong to a multi-unit building: the owner is ordering for three entrances and a dozen windows, and it's far better to measure every opening at once than to come back three times. Near the water the problem is reversed: many condo declarations govern the appearance of façades, and a screen is visible from the street. Rescreening the original frame with the same type of mesh changes nothing about the exterior look, which is exactly the argument that gets a repair approved where a full replacement would need permission. The borough's language profile is also mixed: technical explanations are given in French or English, whichever is asked for.

Lachine sits on the water, and that shows up in the mesh choice. Being close to the canal and the open water sustains insect pressure that drier inland streets don't see: gnats and no-see-ums in spring, mosquitoes all summer as soon as the wind drops. Standard fibreglass stops mosquitoes but lets no-see-ums through — they are smaller than its mesh openings. Close to the water, tight-weave no-see-um mesh earns its place, with the understanding that it passes slightly less air. On façades exposed to wind off the water, aluminum holds up better than fibreglass, which bows and pulls out of its channel over time.