Step 7. The greenhouse cover

Cover the greenhouse with an ultra-violet-resistant polythene.

Hold the coverings in place by laying thin battens over the polythene (when the polythene is taut) and nailing the battens to the greenhouse studs, roof rafters etc.

Cover the doors and windows also.

Most hardware merchants or garden suppliers only stock standard plastic polythene which is not UV-resistant, however, they should be able to advise you where to source polythene required for the greenhouse covering.

One source that might be worth looking at for cover (USA only) is Tyco Plastics