The complete guide
Fitting a velcro window screen
Which size covers your window?
This screen covers an opening up to 100 cm wide and 100 cm tall, which suits a standard single window or a casement sash. Because you cut it down, treat that as a ceiling rather than an exact match. Order above your opening and trim. Order below it and there is nothing to be done.
Measure the frame recess, not the glass. The tape goes on the flat face of the frame around the opening, and that face is what the screen has to reach.
How the velcro fixing works
Hook-and-loop tape runs around the window frame. The screen has a matching velcro edge sewn on. You press one onto the other and that is the whole system. No frame to assemble, no corner pieces, no drill.
It's the cheapest way to screen a window properly, and the reason it works is that the tape grips along the entire edge rather than at a few points. Insects get in through gaps, and a continuous edge does not leave any.
Choosing your mesh
This one comes in standard mesh (grey). Grey fibreglass woven 18 x 16 to the square inch, with 66% open area. It stops flies, mosquitoes and wasps and keeps the view and the breeze. Standard grey mesh is the one most people want. The weave is open enough that you barely notice it from inside, and it still stops everything that normally gets in through an open window.
Think about where you live rather than what the room looks like. Near water, marshland or the coast, midges are the ones that ruin an evening and ordinary fly screen lets them straight through. If you have cats, the question answers itself: standard mesh lasts days against claws.
Fitting it
Wipe the frame face clean and let it dry, because the adhesive gets one attempt. Run the tape around the opening. Lay the screen over it, check it covers, and cut it to size with a blade or a strong pair of scissors. Press the velcro edge down all the way round.
Fifteen minutes for the first window is normal. After that you will do one in five.
Living with it, and taking it down
To open the window, peel an edge back off the tape and press it down again afterwards. That is the honest difference against the magnetic screen, which lifts off with a finger tab. On a window you open every day the magnetic one is worth the extra. On a bedroom window you crack open in July, this is the sensible buy.
At the end of summer, peel the screen off and store it flat. Wash it in warm soapy water first if it has picked up dust, and let it dry completely before it goes away.
Making several screens out of one
Because everything cuts, one large screen can become two or three small ones. Buy the biggest size that suits, cut it into panels, and pick up extra hook-and-loop tape if you run short. Replacement mesh is also sold on its own in all three grades if you only need to re-skin a screen you already own.