Having a crawl space under your house can make your home colder in the winter than a house built insulate under floor:
Installing Hardwood Floors Over Crawl Space. But just fyi i have a 90 year old house with 5/16 x 2 1/4 facenailed. Six percent moisture is a good target for both.
6 Ways Humidity Can Affect Your Hardwood Floor Lauzon Flooring from lauzonflooring.com
If your crawl space isn't ventilated, insulate the walls of the crawl space rather than the subfloor of the room above. After the third row or so, you should be able to use the side nailer. All hardwood and bamboo flooring must be acclimated to its environment before installation.
But just fyi i have a 90 year old house with 5/16 x 2 1/4 facenailed.
Learn all about shaw hardwood floor moldings, their purpose, and how to install them by clicking on the links below. After the third row or so, you should be able to use the side nailer. You should avoid installing hardwood over a crawl space if the bottoms of the floor joists are closer than 18 inches to the ground, or you will have moisture problems. If the installation is over a crawl space, make sure there's a moisture retarder in the crawl space and install an extra one if the existing one.
