Question: how much does it cost to build a spider tie concrete house?
Answer: The ties can be used to form flat or curved walls (the latter have two or more layers of thin plywood facing), or even lightweight concrete roofs. Cost is $135 for a box of 100 ties, or a little over $17 per running foot of 8-foot-high wall. Spider Tie, 866/752-3950, spidertie.com.