"Martin Brown" wrote in message
...
On 04/07/2011 15:49, john brook wrote:
We have a sheet steel garden shed, and with any sun at all it gets
unbearably hot inside.

We put up polystryene slabs under the roof, but that was to stop the
condensation dripping down inside in the winter. It does not help with
the
problem of the shed getting too hot.

There is a limit to what you can do in a small space without any airflow.
Paradoxically your best bet might be to glue aluminium foil onto the
underside of the polystyrene slab. This slows down ingress of solar heat
by making it harder for the polystyrene to radiate energy.

Grateful for any suggestions as to best how to keep it cooler in this
warm
weather, please.

The other trick is to make the exterior partially or entirely self shading
by having a second outer skin on battens. Ivy works pretty well as it
includes its own airconditioning and looks better than sheet steel.

Trying to cut out holes in that tin sheeting would I guess be a difficult
task, and I've no idea if it would be of much help? Thanks for any
advice.

Letting the hottest air out the top and allowing cooler air in at ground
level will help a bit. You want a vent that lets hot air out but doesn't
allow rain to get in.

Regards,
Martin Brown

What about the obvious - a turbine / roof ventilator? The hot air is
enough to keep them moving when the wind is calm. It should be possible to
seal it off from inside the shack during the winter to trap any heat
indoors.

Good Luck.