Talk:Forcefield Upgrades/@comment-24.127.48.40-20120828230817/@comment-2.24.213.160-20120829020907

Stick a door in place before you activate the field, as long as it doesnt have the block cutter upgrade, the door will remain in place, as will any pre-existing blocks.

Warning though, if used as Blast protection, the door counts as a door so will blast apart as easy as normal before the field can close over the resulting hole. (Reinforced doors however work fairly well if placed on Reinforced stone, won't survive a Nuclear blast however)