BuzzSkito Mosquito & Tick Control Specialists · Published August 22, 2026
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You Already Own the Expensive Part
Most mosquito-shelter advice online is written for someone standing on an open lawn, which is why it keeps recommending screen tents and gazebos. If you have a covered porch, a deck under a second-storey overhang, or a solid-roof pergola, that advice is wrong for you: you already own the roof, the posts and the floor. What you are missing is mesh and a way to hang it.
That changes the budget completely. A freestanding screened structure has to pay for a frame and a roof before it stops a single mosquito. A curtain kit pays only for mesh, hardware and doors — which is why a porch of two or three openings can be closed in for a few hundred dollars, while the equivalent freestanding structure starts at several times that. If you are still deciding between the two approaches, our comparison of every patio mosquito screen option lays them side by side, and if you have no roof at all, the hardtop versus soft-top gazebo comparison is the decision you actually face.
One thing a curtain kit is not: a screen-room addition. Those are framed walls with screen set into spline channels, built by a contractor, and they are a different budget and usually a different permitting conversation. Everything below is about hanging removable mesh from a structure that already exists.
Measuring: The Step That Decides Whether It Works
More screened-porch projects fail at the tape measure than anywhere else, because people measure one width, one height, and order. Decks and porches are not square. Here is the sequence that avoids the gap:
- Measure each opening separately. Never assume two bays between the same posts are identical — they routinely differ by a centimetre or more.
- Width at three heights, height at three widths. Top, middle and bottom for width; left, centre and right for height. Order to the largest width and the shortest height, then take up the difference with tension and a hem.
- Record what you are fastening into. A solid beam takes a lag screw happily. A fascia board, an open joist bay, aluminium soffit or vinyl cladding each need a different fixing, and a track screwed into vinyl alone will pull out the first windy night.
- Note the deck slope. Decks are pitched slightly for drainage. A hem cut dead level will stand off the boards at one end — that is the gap that lets mosquitoes in.
- Decide the doors first. Door position dictates how the run is divided into panels. Working it out after the panels arrive means living with a door in the wrong place for years.
- Add up total linear feet. That number, plus door count, is what quotes are actually built from — useful for comparing a DIY kit against a fabricator without guessing.
Where Zip-Track Systems Fail in Wind
Zip-track deserves its reputation: a zipper welded to the panel edge running inside a rigid side channel captures the panel on all four sides, and nothing else hanging seals as well. It is also the system with the most specific failure mode, and it is worth understanding before you spend the money.
Under a gust, the panel bellies outward like a sail. That load does not distribute evenly — it concentrates at the top corner, where the zipper enters the channel. Once the zipper works out of the channel by even a few centimetres at that corner, the panel is no longer captured, the belly gets deeper, and it unzips itself the rest of the way down. What people describe afterwards as “the zipper broke” is usually the panel having peeled out and taken the zipper tape with it.
Three things reduce it, all worth doing:
- Weight or bar the bottom hem so the panel cannot balloon in the first place. This is the highest-value fix and it costs almost nothing.
- Respect the panel width limit. Manufacturers publish a maximum span for a reason; closing a 16 ft opening with one sheet instead of two is the most common cause of failure.
- Roll the panels up when real wind is forecast. A rolled panel is a non-event. Southern Ontario gust fronts build in about fifteen minutes on a still July afternoon, so make it a habit rather than a reaction.
And check before you buy that replacement panels are sold on their own. A zip-track system whose panels are only available as part of a full re-order is a much more expensive product than its sticker suggests.
Choosing the Mesh
Fibreglass insect screen is the roll product on the shelf at every Canadian big-box store. It is cheap, easy to cut, and completely adequate for a sheltered opening under a deep roof overhang. It also sags over a long span and tears if a chair or a dog finds it.
Heavy vinyl-coated polyester is what custom fabricators use, and it is the upgrade worth paying for on anything exposed. It resists tearing, holds its shape rather than billowing, and takes several seasons of weather. You give up some airflow and the view out is a touch darker — a fair trade on a windy corner lot, a poor one on a sheltered porch you sit on in August heat.
No-see-um mesh is the finest weave. Standard screen stops mosquitoes and blackflies, but biting midges are small enough to pass straight through it, which is why people sit inside a properly closed porch and still get bitten at dusk. If you back onto a creek, ravine, stormwater pond, marsh or lake, buy the fine mesh — our guide to no-see-ums and biting midges in Ontario covers where and when they are worst.
One free decision: choose black or charcoal mesh over silver or grey in whatever grade you buy. Dark mesh scatters far less light and reads much more transparent from inside — the view is noticeably better for zero extra cost.
The Gap Almost Every Canadian Porch Leaves Open
Here is the mistake we see most, and it has nothing to do with which kit you bought. People close the vertical openings beautifully and leave two gaps.
The bottom hem. Decks are pitched for drainage and boards cup and twist. A hem cut to a level line will sit tight at one end of a run and stand a centimetre or two off the boards at the other. That gap is at ankle height, which is exactly the altitude mosquitoes fly at — and it is the reason a porch that looks perfectly sealed still fills up at dusk. Fix it with a weighted hem that follows the boards, a bottom tension bar, or a wood batten strip screwed down over the mesh. Any of the three works; leaving it is what does not.
The top of the opening. If the porch roof has open joist bays facing into the space, or a vented soffit above the header line, insects come in over the top of your panels no matter how well the sides seal. Look up before you order. Either run the track on the underside of the beam so the panel closes against a solid face, or block and screen the joist bays first.
There is a third, less common one: if the porch floor is decking over open air, insects can come up through the gaps between boards. Screening a perimeter skirt below the deck closes it, and it is the same job many homeowners already do to keep skunks and raccoons out from under a deck.
Build a Real Door
The component people skip. Without a dedicated door, someone carrying a tray unzips an entire panel, and it stays open for the rest of the evening — which quietly undoes the whole installation. A magnetic panel closes itself behind you hands-free, which is why it is the right answer for the route between the kitchen and the table. A zippered door seals better but needs a free hand, so it suits a secondary exit to the yard.
Whichever you fit, reinforce the top edge with the supplied hook-and-loop strip so it cannot sag, and size it to the actual opening rather than to the nearest listed size — a curtain even slightly narrow gaps at the top and undoes the point. Our guide to choosing and measuring a magnetic screen door covers the sizing that catches people out.
DIY Kit or Custom Fabrication?
Both are legitimate. The dividing line is geometry, not budget.
Buy a DIY kit when the openings are rectangular, the heights are standard, the header gives you something solid to screw into, and you are comfortable with a drill and a level. A typical two- or three-opening porch lands in the $250–$900 range this way, and most of the variation is door count and hardware grade rather than mesh.
Go custom when the geometry fights you: arched or raked openings, a span beyond what stock panels cover, a sloped ceiling, or a header you cannot fasten to conventionally. Also go custom when appearance is the point — fabricated panels in a colour-matched channel look built-in in a way a hung curtain does not, which matters if this is part of a renovation you expect to recoup on resale. Canadian custom packages generally start around $900 and rise steeply with opening count, height, door hardware and any motorised operation.
The honest middle path nobody sells: mesh off the roll, stretched and captured under painted batten strips, on the two or three openings that matter. It is not openable and it is not elegant, but it seals as well as anything on this page and it costs less than any kit. If you are not moving for a decade, it is a genuinely good answer.
Canadian Seasons, Storage and Where to Buy
Take the panels down before winter, on every system. Snow sliding off a porch roof lands on them, ice loading stretches mesh and hems permanently, and cold makes vinyl-coated fabric stiff enough to crack where it folds. Leave the track or channel mounted — that hardware is built to stay outside — and cap the channel ends if caps are supplied, so grit and ice cannot pack into the run. Roll the panels rather than folding them, label them by opening, and store them dry indoors. Done properly they last several seasons; left up through an Ontario winter, many do not see a second summer.
For stock: Home Depot Canada, Rona and Canadian Tire carry insect screen by the roll, spline, screen tools and batten stock year-round, which covers the DIY route entirely. Amazon.ca is where the curtain kits, track hardware, zip-track panels, no-see-um mesh, hem weights and door panels actually live, and it is the only channel that has them in August rather than only in May. Custom fabrication is local: search for awning and marine canvas shops in the GTA as well as sunroom companies, since canvas shops do this work and are frequently better value on a straightforward porch.
On permits: requirements vary by municipality, and one phone call before you drill is worth it. As a general pattern, hanging removable mesh from an existing roofed structure is treated differently from building permanently enclosed framed walls, which is construction. If the porch is a condo or townhouse common element, your condominium corporation is the more likely gate.
The Bottom Line
Screening an existing deck or porch is the best value in backyard mosquito protection, because you have already bought the roof. Measure every opening at three points, decide door positions before you order, choose mesh by what is actually biting you rather than by price, and spend the small money on a hem that follows the deck — that hem is the difference between a porch that works and one that fills up at dusk anyway. Track and curtains for most people, zip-track if you want the finished look and will roll the panels for wind, batten strips if you want the cheapest thing that genuinely seals. Then remember what the mesh does not cover: everything outside it.
Frequently Asked Questions
What is a mosquito screened porch kit?
It is mesh plus a way to hang it off a structure you already own. A kit typically contains screen panels sized to your openings, mounting hardware (a ceiling track with carriers, a zip-track side channel, or a snap and hook-and-loop perimeter), and fixings. It is not a screen-room addition: those are framed walls with screen set into spline channels, built by a contractor. If you already have a roof over the space — a covered porch, a deck under a second-storey overhang, a solid-roof pergola — a curtain kit is the right product, because the expensive part of a gazebo or a screen tent is the roof you already have.
How much does it cost to screen in an existing porch in Canada?
A DIY track-and-mesh kit for a typical porch with two or three openings generally lands in the $250 to $900 range, driven almost entirely by total linear feet of opening and how many doors you need. Mesh by the roll with wood batten strips is cheaper still if you are willing to make it semi-permanent. Custom-fabricated screen curtain packages from Canadian shops usually start around $900 and climb from there with opening count, height, door hardware and motorised options. The variable that moves the number most is not the mesh — it is the hardware and the door count.
How do I measure a porch for screen panels?
Measure every opening separately, and measure width at the top, middle and bottom, then height at the left, centre and right. Almost no deck or porch is square, and ordering to one measurement is the most common way people end up with a gap. Record what the track will fasten into — a solid beam, a fascia board, an open joist bay, or an aluminium soffit each need different fixings. Note the deck slope: most decks are pitched slightly for drainage, so the bottom hem has to follow a line that is not level. Finally, decide where doors go before you order, because a door position changes how the panels are divided.
Do zip-track screen systems hold up in wind?
They give the best seal of any hanging system and they are the most wind-sensitive part of it. The panel edge carries a zipper that rides inside a side channel. Under gust load the panel bellies outward, the load concentrates at the top corner, and the zipper starts to peel out of the channel there; once it is out even a few centimetres the panel behaves like a sail and unzips itself the rest of the way. Mitigations that work: a weighted hem or bottom bar so the panel cannot balloon, keeping each panel within the manufacturer maximum width instead of spanning a wide opening with one sheet, and rolling the panels up when real wind is forecast. Before buying, confirm replacement panels are sold separately.
What mesh should I use for a screened porch in Ontario?
Three practical grades. Standard fibreglass insect screen is the cheapest, sold by the roll at any Canadian big-box store, and it is fine for a sheltered opening — it sags and tears more easily. Heavy vinyl-coated polyester mesh is what custom shops use: far more tear-resistant, tolerates wind and pets, and lasts several seasons, at the cost of some airflow and a slightly darker view. No-see-um mesh is the finest weave and the one to buy if you back onto a ravine, creek, marsh or lake, because standard mesh does not stop biting midges. Choose black or charcoal over silver in any grade — dark mesh reads far more transparent from the inside.
Where do mosquitoes get into a screened porch?
Almost always at the bottom hem and the top of the opening, not through the mesh. Decks are pitched for drainage and boards are rarely flat, so a hem cut to a level line leaves a gap of a centimetre or two along part of the run — at ankle height, which is exactly where mosquitoes fly. The other leak is above the header: if the porch roof has open joist bays or a vented soffit facing into the space, insects drop in from over the top of the panels. Fix both before you blame the screen: weight or batten the bottom hem to follow the deck, and block or screen the joist bays at the top.
Do I need a building permit to screen in a porch in Ontario?
Requirements vary by municipality, so make one phone call before you start. As a general pattern, hanging removable mesh curtains from an existing roofed structure is treated very differently from building framed, permanently enclosed walls — the second is construction and commonly does need a permit, while removable curtains commonly do not. If your porch is a condo or townhouse common element, the more likely gate is your condominium corporation rather than the city. Ask before you drill, not after.
Should I take the screen panels down over winter?
Yes on both types. Snow sliding off a porch roof lands on the panels, ice loading stretches the mesh and the hems, and cold makes vinyl-coated fabric stiff enough to crack at a fold. Leave the track or channel mounted — that hardware is designed to stay outdoors — and remove the panels, roll them rather than folding them, and store them dry indoors. Cap the channel ends if the system provides caps so grit and ice do not pack into the track. Panels stored properly last several seasons; panels left up through an Ontario winter often do not see a second summer.
