[herr_oberst]

My house has a crawlspace of approx 3 feet in height, the living area subfloor is fully insulated with batts, (the edges of the joists are not insulated), water pipes are insulated with foam sleeves, there is a very heavy-duty vapor barrier on the dirt floor plus all of the cracks around the sill and penetration areas have been sealed with spray foam. The walls of the crawlspace are not insulated.

This is a ranch house, built in about '72.

This is Portland, relatively mild winters but wet.

My question is, now that I have the subfloor in the crawlspace very well insulated should the vents be covered?

I used to cover them when there was no insulation (to keep drafts at bay and keep the pipes from freezing...) but now I think I should leave them open to prevent condensation.

Can I get your thoughts?