# Northline Insulation
> Published answers about construction, written from Northline Insulation's own material and reviewed by a person before publication.
Main site: https://northline-insulation.example.com
Research hub: https://askdae.com/t/northline/answers
Full text: https://askdae.com/api/public/answers/northline/md
## Answers
- [How much does spray foam insulation cost per square foot?](https://askdae.com/t/northline/answers/spray-foam-cost-per-square-foot)
- [Open-cell vs closed-cell spray foam: which should I use?](https://askdae.com/t/northline/answers/open-cell-vs-closed-cell)
- [What R-value do I need in an attic in Minnesota?](https://askdae.com/t/northline/answers/attic-r-value-minnesota)
- [How long does an attic insulation job take?](https://askdae.com/t/northline/answers/attic-insulation-timeline)
- [Is insulating a crawlspace worth it?](https://askdae.com/t/northline/answers/crawlspace-insulation-worth-it)
- [Do I need a vapor barrier with spray foam?](https://askdae.com/t/northline/answers/vapor-barrier-with-spray-foam)