“We know lava has structural integrity because we have built columns from lava rocks to support whole houses,” says Pálmadóttir, adding that “90% of Icelandic concrete is basalt.
If you want colored pea gravel, prepare to budget for an extra $20-50 per cubic yard. Lava rock is a popular choice among homeowners. The rough, misshapen, red rocks are a bit more expensive than pea ...