On returning from a camping trip a few weeks back to find almost half of my Pak Choi had been destroyed by the spawn of the darn cabbage whites! I thought I had better do something about that before planting out my Chinese cabbage. With some blue MDPE water pipe I had behind the shed, a bundle of 25x50mm batten which I almost always have some in the garage for emergencies! All I had to purchase was a roll of debris netting.
I have wooden sided raised beds with slightly raised posts in each corner, these are really handy for this project as it will keep the cover firmly in place.
Step 1 - measure the existing bed and make a simple frame from 25x50mm batten, pilot drill and screw pieces together before drilling 19mm holes at equal distances along the length of the frame.
Step 2 - cut the 20mm MDPE pipe to the required length ensuring it gives you your desired height for the cover, then I pushed these in to the holes on the frame, the pipe is 20mm outside diameter so it fits nice and snug meaning it wont come free and I didnt require any further mechanical fixing.
Step 3 - I cut a length of debris netting off the roll and used a staple gun to attach it all around the frame, pulling it fairly tight to make sure it doesn,t sag or blow too much in the wind.
Step 4 - fit on to existing raised bed for caterpillar protection! if you check to make sure you don't have slugs already in your bed it will also double up as protection from those two as mine fits tight against the top edge of the raised bed.