What is the best way to Insulate the crawl space of an old home?

Updated: Sept. 4, 2020

I have a 120 yr old home with a dirt crawl space that is completely dry, no Mold in the entire home, has new windows and new insulation in the attic. I have started the insulation in the floor joist from the crawlspace. I would like to know the correct way to insulate my crawl space regarding vapour barrier and what to do around vents and plumping pipes when installing.  

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