Architect riddles

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Across
  1. 2. i am what makes buildings collapse on their own weight
  2. 4. without me arches would be a pile of ruble along with everything its was holding
  3. 6. i use force and weight to press things into shape
  4. 8. i hold up my friend so he can hold the structure
  5. 10. not only do i look good but i'm also held up pretty well
Down
  1. 1. I am the space between structures
  2. 2. i hold together buildings from tool sheds to skyscrapers, im the start of literally every bulding
  3. 3. im the long rope you see holding up bridges
  4. 5. without me there would be nobody to build and maintain your bridges and buildings
  5. 7. like my friend i hold up supports
  6. 9. rhymes with march and is a very strong form of support