Where can I buy styrofoam? is it anygood? ideas please ('replacement' window)

[Chris.Holland16]

I need to leave fairly small-medium window wide open

I have been told about something called 'styrofoam'

can anyone recommend any websites? I have googled it but am a bit conufsed by the number of different types of foam.

(need to leave a little hole in the corner for an antenna - I can cut this out myself) (window is only to be left open for a few hours at a time and opens out onto private courtyard with CCTV and is high up so no security risk)

I'm hoping someone here can help me! thanks

[Slurp]

Styrofoam is expanded polystyrene.

I think what you are after is 'Plexiglas or Perspex.

Slurp

[Newshound]

Or perhaps polycarbonate, which is a similar glass-clear sheeting, a bit more impact-resistant than acrylic (perspex), although it becomes cloudy and yellow over some years in direct sunlight. Readily available in the sheds.

[Chris.Holland16]

the polysterene will do - keep the heat out..

it's cheaper than perspex anyway, isn't it

I wish there was a website, where I could just enter dimensions & get delivery (I'm really busy)

thanks

[Frank Erskine]

If it really is expanded polystyrene that you want, B&Q sell it up to a few inches thick.

[Owain]

Or there will be stacks of it poking out of people's wheelie bins on Boxing Day.

It can be cut/shaped using a piece of electric fire element wire connected to a battery or transformer.

Owain

[The Natural Philosopher]

or a breadknife and a light fine grit sanding.