我在网上research,
http://www.decks.com/articles.aspx?articleid=23
有网友说，不用那么深，用成型混凝土就行了。不知道有什么根据。 如果有道理的话，我就放心很多了，因为我的是自己挖的一尺半深，听说有冰冻线一说后，总不踏实。
引用：
1： 4-foot is for fence, not deck. HD has deck base to buy directly, you just dig < 1 foot. -joefqliu(joe); 09:46 (#3681256
2： Don't worry, the frozen soil expansion is very small about 1/1000 per year. Almost all of the deck in newly developed area are using concret blocks. You can also buy ready concret mix from home depot. Dig holes, add water, it really simple. -ding_ding(丁_丁); 5.16 16:03 (#3679893
http://www.decks.com/articles.aspx?articleid=23
有网友说，不用那么深，用成型混凝土就行了。不知道有什么根据。 如果有道理的话，我就放心很多了，因为我的是自己挖的一尺半深，听说有冰冻线一说后，总不踏实。
引用：
1： 4-foot is for fence, not deck. HD has deck base to buy directly, you just dig < 1 foot. -joefqliu(joe); 09:46 (#3681256
2： Don't worry, the frozen soil expansion is very small about 1/1000 per year. Almost all of the deck in newly developed area are using concret blocks. You can also buy ready concret mix from home depot. Dig holes, add water, it really simple. -ding_ding(丁_丁); 5.16 16:03 (#3679893